IMAGE  EVALUATION 
TEST  TARGET  (MT-S) 


<.  % 


4a 


1.0 


I.I 


1.25 


U 


2.0 


1.8 


1-4    IIIIII.6 


Photographic 

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CIHM/ICMH 

Microfiche 

Series. 


CIHM/ICMH 
Collection  de 
microfiches. 


Canadian  Institute  for  Historical  Microreproductions  /  Institut  Canadian  da  microreproductions  historiques 


Technical  and  Bibliographic  Notes/Notes  techniques  et  bibliographiques 


The  Institute  has  attempted  to  obtain  the  best 
original  copy  available  for  filming.  Features  of  this 
copy  which  may  be  bibliographically  unique, 
which  may  alter  any  of  the  images  in  the 
reproduction,  or  which  may  significantly  change 
the  usual  method  of  filming,  are  checked  below. 


L'Institut  a  microfilm^  le  meiiieur  exemplaire 
qu'il  lui  a  6t6  possible  de  se  procurer.  Les  details 
de  cet  exemplaire  qui  sont  peut-dtre  uniques  du 
point  de  vue  bibliographique,  qui  peuvent  modifier 
une  image  reproduite,  ou  qui  peuvent  exiger  una 
modification  dans  la  methods  normale  de  filmage 
sont  indiquds  ci-dessous. 


□    Coloured  covers/ 
Couverture  de  couleur 

□    Covers  damaged/ 
Couverture  endommagie 

□    Covers  restored  and/or  laminated/ 
Couverturo  restaurie  et/ou  pellicul6« 


□    Coloured  pages/ 
Pages  de  couleur 

□    Pages  damaged/ 
Pages  endommagdes 

□    Pages  restored  and/or  laminated/ 
Pages  restaurAes  et/ou  pellicul6es 


D 
D 
D 


Cover  title  missing/ 

Le  titre  de  couverture  manque 


Coloured  maps/ 

Cartes  gdographiques  en  couleur 

Coloured  ink  (i.e.  other  than  blue  or  black)/ 
Encre  de  couleur  (i.e.  autre  que  bleue  ou  noire) 


r~~l/ Pages  discoloured,  stained  or  foxed/ 
I  ^   Pages  d^colordes,  tachetdes  ou  piquies 


r~~1    Pages  detached/ 


0 


Pages  d6tach6es 

Showthrough/ 
Transparence 


D 


Coloured  plates  and/or  illustrations/ 
Planches  et/ou  illustrations  en  couleur 


□    Quality  of  print  varies/ 
Quality  in^gale  de  I'impression 


Q^ 


Bound  with  other  material/ 
Reli6  avec  d'autres  docuntents 


n 


Includes  supplementary  material/ 
Comprend  du  matdriel  supplementaire 


D 


D 


Tight  binding  may  cause  shadows  or  distortion 
along  interior  margin/ 

La  reliure  serree  peut  causer  de  I'ombre  ou  de  la 
distortion  le  long  de  la  marge  intdrieure 

Blank  leaves  added  during  restoration  may 
appear  within  the  text.  Whenever  possible,  these 
have  been  omitted  from  filming/ 
II  se  peut  que  certaines  pages  blanches  ajoutdes 
lors  d'une  restauration  apparaissent  dans  le  texte, 
mais,  lorsque  cela  dtait  possible,  ces  pages  n'ont 
pas  6t6  filmdes. 


D 
D 


Only  edition  available/ 
Seule  Edition  disponible 

Pages  wholly  or  partially  obscured  by  errata 
slips,  tissues,  etc.,  have  been  refilmed  to 
ensure  the  best  possible  image/ 
Les  pages  totalement  ou  partiellement 
obscurcies  par  un  feuillet  d'errata,  una  pelure, 
etc.,  ont  iti  filmdes  d  nouveau  de  facon  ^ 
obtenir  la  meilleure  image  possible. 


D 


Additional  comments:/ 
Commentaires  suppl6mentaires: 


This  item  is  filmed  at  the  reduction  ratio  checked  below/ 

Ce  document  est  film6  au  taux  de  reduction  indiqui  ci-dessous. 

10X  14X  18X  22X 


y 


26X 


30X 


12X 


16X 


20X 


24X 


28X 


32X 


The  copy  filmed  here  has  been  reproduced  thank* 
to  the  generosity  of: 

Library, 

Geological  Survey  of  Canada 


L'exemplaice  film6  f ut  reproduit  grflce  d  la 
g6n6ro8it6  de- 

Bibliothique, 

Commission  Gtoiogique  du  Canada 


The  images  appearing  here  are  the  best  quality 
possible  considering  the  condition  and  legibility 
of  the  original  copy  and  in  keeping  with  the 
filming  contract  specifications. 


Les  images  suivantes  ont  6t6  reproduites  avec  le 
plus  grand  soin,  compte  tanu  de  la  condition  et 
de  la  nettet6  de  I'exemptaire  film6,  et  en 
conformity  avej  les  conditions  du  contrat  de 
filmage. 


Original  copies  in  printed  paper  covers  are  filmed 
beginning  with  the  front  cover  and  ending  on 
the  last  page  with  a  printed  or  illustrated  impres- 
sion, or  the  back  cover  when  appropriate.  All 
other  original  copies  are  filmed  beginning  on  the 
first  page  with  a  printed  or  illustrated  impres- 
sion, and  ending  on  the  last  page  with  a  printed 
or  illustrated  impression. 


The  last  recorded  frame  on  each  microfiche 
shall  contain  the  symbol  -♦-  (meaning  "CON- 
TINUED"), or  the  symbol  V  (meaning  "END"), 
whichever  applies. 

Maps,  plates,  charts,  etc.,  may  be  filmed  at 
different  reduction  ratios.  Those  too  large  to  be 
entirely  included  in  one  exposure  are  filmed 
beginning  in  the  upper  left  hand  corner,  left  to 
right  and  top  to  bottom,  as  many  frames  as 
required.  The  following  diagrams  illustrate  the 
method: 


Les  exemplaires  originaux  dont  la  couver*ure  en 
papier  est  imprimis  sont  filmis  en  commandant 
par  le  premier  plat  et  en  terminant  soit  par  la 
dernidre  page  qui  comporte  una  empreinte 
d'impression  ou  d'illustration,  soit  par  le  second 
plat,  selon  le  cas.  Tous  les  autres  exemplaires 
originaux  sont  film6s  en  commenpant  par  la 
premidre  page  qui  comporte  une  empreinte 
d'impression  ou  d'illustration  et  en  terminant  par 
la  dernidre  page  qui  comporte  une  telle 
empreinte. 

Un  des  symboles  suivants  apparaitra  sur  la 
dernidre  image  de  cheque  microfiche,  selon  le 
cas:  le  symbols  — »>  signifie  "A  SUIVRE  ".  le 
symbols  V  signifie  "FIN". 

Les  cartes,  planches,  tableaux,  etc.,  peuvent  dtre 
film6s  d  des  taux  de  reduction  diff^rents. 
Lorsque  le  document  est  trop  grand  pour  dtre 
reproduit  en  un  seul  cliche,  il  est  f  ilmd  A  partir 
de  Tangle  sup6rieur  gauche,  de  gauche  d  droite. 
et  de  haut  en  bas,  en  prenant  le  nombre 
d'images  ndcessaire.  Les  diagrammes  suivants 
illustrent  la  mdthode. 


1 

2 

3 

1 


1 

2 

3 

4 

5 

6 

* 


^MM 


4 1 


SMITHSONIAN  MISCEIIAXEOIS  COLLECTIONS. 

171    ^ ^_-_ 


t 


MOXOGllAPIIS 


OP  TUE 


D    I    P    T    E    R    A 


OF 


NORTH  AMERICA. 


PREPAUED   FOR   THE   SMITHSONIAN   INSTITUTION 

BY 

H.  '  I.  OE  W. 


PART     IK. 


KDITKD    BV 

R.    OSTEN    SAC  KEN, 


WASHINGTON: 

SMITIISONIAX    INSTITUTION. 

j.\m:aky,  iMjj. 


■ifSf.: 


si*''*  .'ii'l 


1 


•:■■■'■"; 

Kfii"' '  ■■■-. 

1/ iiV-  ■-    ■ 


1 


13 

■    Mi-'v''-'"' 
."■■*'' 'I 


(;.■ 


J     :;   <, 


aj)Vi:uti8i:mknt. 


TiiK  jtroscnt  i)ii1)li('atit)n  is  tlic  sccoiid  part  of  a  Wi.rk  on  \ort1i 
Aiui-'ricjiii  Diptcrii  in  pntccss  of  prcpiiration  )iy  Dr.  Jl.  Tioew,  uf 
Mcsoritz,  Priissi",  uiitlcrliiki'ii  at  llie  ospi-cinl  riMpiost  of  tlio 
Siiiithsoiiian  J  lis.. tut  ion.     'I'lic  nnilcrials  liavc  Im-cu  dcrivoU  i)nn- 

<''I»''"y  f' I  til*'  collcrtii.n  (.1'   15ai-i.u    II.   Ostcii   Sacivon,  Consiil- 

(jciHTal  of  Ifussia  in   New  V.nk,  kindly  inlrustt'd  to  the  author 
fill"  t'xaniination. 

Tiic  work  will  appear  in  monographs  of  jrcnt-ra  and  funulios, 
suiliciciit  nnilcrials  liciiiu-  on  hand  for  illustratin«r  particular  groups 
tnily.  AiitliDiit  rcla'ion  to  their  systeniatic  sfMpicnce. 

Tiic  Institution  is  under  oltlii-at ions  to  J5aron  Osten  Saeken  for 
Miperintendinn-  the  translation  ..f  the  work  from  the  German  manu- 

^••ripT,  ami  ediliii-,^  it,  as  well  as  for  eorreetin.u-  the  jtroof-sl (s. 

JOSKIMI   MKNKY, 

Hccrctari/  S.  I, 
Bmithsomax  Ixstitdtion', 

Washi.noto.n,  January,  18(34. 


» 


Pim.ADn.PiiiA: 

e  O  1. 1.  J  .\  «  ,    •  R  1  >•  I  E  1 


i 


m 


i 


PREFACK. 


^i 


I*' 


I\  tlic  present  work  I  have  atteinptod  to  g-ive  .a  Monnp-ajili  df 
tlio  North  Aiiicrican  hoUchojMxliiln.  'I'he  <i(")j^rapliiciil  area  ciii- 
Viraced  in  it,  as  well  as  in  my  former  Moiioji'raphs  on  North  Ameri- 
can Diptera,  is  the  same  whieii  has  been  a<h>pte(l  in  IJarou  Osti'n- 
Sai'ken's  Cataloiiue,  coniprisiiitf  Mexie(»  and  ('ul)a.  I  readily 
uekno\vl('di>-c  tiiat  hy  adopting  sneh  a  wide  area  for  tlie  North 
Aniericai!  fauna,  we  introduce  many  species  whicli,  jtroperly 
speakinir,  helong  to  a  more  soutlieru  fauna.  IJut  I  was  in(hi<'cd 
to  a(h>|)t  this  course  as  much  hy  tlie  circumstance  that  1  possessed 
nniny  interestiuii'  sj»ecies  from  ^lexico  and  Cuha,  as  hy  tlie  advan- 
tage of  conforming  to  the  }.ianof  the  Ciitalogue  of  Osten-Nackcn. 
and  tlius  alfording  a  general  view  of  tlie  fauna  of  a  larger  extent 
of  country.  As  the  order  of  Diptera  is  remarkahle  for  the  wide; 
geographical  rnnge  of  the  species,  and  as,  for  this  reason,  the 
limitation  of  local  faunas  is  more  indefinite  here  than  in  most 
other  orders,  the  adoption  of  this  somewhat  arbitrary  limitation 
of  the  Xortli  American  entomological  area  cannot  i)resent  any- 
thing ol)jeetionaI)le. 

For  the  greatest  part  of  the  materials  on  which  my  work  i.s 
based,  I  am  indebted  to  the  liberal  and  disinterested  assistance  (tf 
my  esteemed  friend  IJaron  Osten-Sacken.  Some  very  interesting 
species  were  communicated  to  me  by  ]Mr.  Le  liaron,  of  Jilinois. 
Tlie  greater  number  of  the  species  from  Sitka  was  collected  by 
^Ir.  Sahlberg,  and  communicated  \o  me  for  description  by  Pro- 
fessor Maeklin  in  Ilelsingfors  ;  some  sjx'eics  o*' the  same  region 
are  in  the  Museum  of  IJerlin,  and  were  obtained,  if  1  am  not 
mistaken,  also  from  Mr.  SahHx'rg.  The  study  of  the  types  of 
Wiedemann's  Collection,  very  liberally  lent  to  me  for  examination 


IH 


V-    !'"l 


5     i 


i,"     I, 


,1 


:,l;l 


UA 


Iv 


rUKFAPK, 


t)V  the  Directors  of  tlio  Un/'mihinilii-n  Knhinvl  in  Vienna,  nlTorded 
nie  iiirorniation  of  tiie  ninst  vaiutiliie  eliaraeter. 

Aitliou^ii  tiie  materials  tints  pnt  at  my  disposal  can  he  called 
(ihuiidtint,  tliey  did  not  liy  I'ar  reach  the  extent  which  1  conld 
desire  for  the  preparation  of  stich  ii  monojiraph.  1  hojte,  how- 
over,  that  new  supplies  will  enaltio  me  soon  to  attempt  a  reneweil 
and  more  thoroiijih  work  on  the  same  snl)Jecl.  I  luive  to  thank 
most  cordially  all  those  who  have  contril)uted  by  their  colkM-tions 
towards  the  completion  of  this  monooraph,  and  at  the  same  timu 
1  eai'in'stlv  renuest  all  North  American  collectors  who  take  nnv 
interest  in  the  order  of  J)iptera  to  favor  me  l»y  sindlar  commnnica- 
tions,  They  can  reach  me  either  thronuh  the  medium  of  the 
Smithsonian  Institution  or  thronuh  llaron  Osten-Sacken. 

With  regard  to  the  systematic  distriltntion,  1  have  conrinned  to 
J)nild  upon  the  fotiiidation  lirsl  laid  l»y  Mr.  JIaliday  in  his  admira- 
l)le  pa]ier  on  JkiUcltDjitnliilir,  contained  in  AValker's  J)iptn-(i 
Jlri/aniiicd,  and  later  developed  by  mo  in  the  seventh  part  of  my 
*' AV»c  /»('//n/(v/('."  To  the  jrenera,  adopted  and  defined  in  those 
papers,  I  have  added  afterwards  the  genera  I'/arjidncurus  and 
Lili'oncnras,  based  upon  North  American  species.  (Conf  Wieii. 
Kntoni.  Monatsschr.  isf)",  ]).  37.)  In  the  eijj,htli  fascicle  of  my 
"  Ne'.ie.  Jl(;ilra<'(/r,'''  which  was  a  i)rodroine  to  the  present  work,  I 
have  further  added  tlie  ixvuvra  Pclasloin'itrus  and  l)ii»itr(i<'us  ;  the 
lirst  embraces  some  species  which  formed  i)revious]y  a  sharply 
limited  and  well  characterized  jjroup  within  the  genus  Gi/nuxtp- 
(cm lis;  the  latter  was  established  for  a  species  which,  by  its 
general  habitus,  reminds  equally  of  'niinojihilta^  and  JjihroKi/lii.^, 
but  is  distinguished  from  both  Ijy  the  iiresencc  of  distinct  hairs 
on  the  upper  side  of  the  first  joint  of  the  antenme.  In  the 
present  publication  I  have  added  the  new  genus  Paraclius, 
which  combines  the  neuration  of  the  wings  of  Prlo.stuni'iti'us 
with  some  characters  of  Gi/mtioptt'nnis  and  at  the  same  time  is 
too  distinct  from  the  species  of  the  latter  genus,  to  remain  united 
with  it. 

Thus  the  number  of  genera,  the  usefulness  or  necessity  of  which 
I  at  present  recognize,  amounts  to  forty-three.  After  a  general 
introduction,  I  give  a  table  for  their  determination,  and  then  cha- 
racterize them  in  detail  at  the  i)roper  place.  It  will  hardly  bo 
necessary  for  me  here  to  attempt  to  correct  the  misapprehension 


»1 


ii 


.J'-m 


)W  ■':*'■• 


I'UKKACK. 


that  the  clianK'tors  used  fur  the  coiislniclion  dt"  tho  inhlc  arc  iit  tlif 
siiiuc  lime  tluMiKisl  iiiiportaiil  ;r''ii<'ri('  fliaractcrs  ;  far  from  siu-li 
liciiif^  tlio  cast",  I  liavo,  l>iit  mily  in  a  few  rare  iiistahccs,  tried  to 
facilitate  the  diserimiiiatinii  of  jicnera  liy  prefei'fiii^  to  use  charae- 
tei's  applicable  only  to  North  American  species  (for  iii^taiiee 
in  the  separation  of  (I'l/iiiiKiplri-inis  from  the  ;>'enera  immediately 
followinir  it). 

The  merit  of  the  adopteil  distril)iitioii  in  [i'diera  has  lieen  tested 
and  proved  l»y  the  circumstance,  that  all  the  lu'wly  discovered 
species  very  easily  found  tlieir  proper  place  in  it.  Of  course,  all 
the  {yeiiera  cannot  i)e  considered  as  ecpially  well  estahlished. 
.Vbove  all  others,  the  distriUutiou  of  the  smaller  species,  for  the 
most  part  ne;rlecte(l  by  collectors,  as  well  as  dillicidt  to  e.vamine, 
still  oilers  many  oiiscure  points.  This  is  especially  meant  for  the 
proper  separation  of  the  <renera  ChnjHutux  and  Did/i/iiirKs.  To 
escape  the  (lifiiculty  of  deiiniiij?  the  proper  position  of  some  Nortli 
.Vnierican  species,  sliowinji'  the  characters  of  both  frenera,  I  hav(! 
l)een  obliti'cd  to  draw  the  line  between  the  two  in  a  somewhat 
diiVereiit  manner.  The  relation  of  the  ^cniis  Ifo'coK/oums  to 
(fi/))n}o/i/cri)iis  is  likewise  not  very  clear.  .\  continued  study  oi 
the  structure  of  the  known  species  and  the  discovery  of  new  ones, 
will  •.^•radiially  remove  this  uncertainty  and  devchtp  the  .systematic 
arranjj^enient,  so  as  to  keep  pace  with  such  an  increase  of  kiiow- 
ledji'c.  I  thi)d\,  however,  that  I  can  ji-ive  in  <>-eneral  the  ]iositive 
assurance,  that  the  location  of  the  species  described  by  me  is  a 
natural  and  not  a  forcecl  one ;  the  only  exception  is  Sijuniilirua 
Imrhotiis.  in  which  the  thund)-like  projection  of  the  second  anten- 
ual  joint  upon  the  inside  of  the  third  is  imich  smaller  than  in  the 
other  species  of  this  frenus.  I  possess  this  s]iecies  oidy  in  a  sinjrle. 
not  well  preserved  specimen.  As  it  can  hardly  l)e  looked  for  in 
any  other  fjenus  but  this.  I  have  deeuwd  it  more  expedient  to 
locate  it  provisionally  here,  than  to  f(Mind  \ipon  it  a  new,  perhaps 
not  jnstiliable  fjentis. 

I  have  taken  pains  to  elucidate  conscientiously  the  rather  con- 
siderable innnber  of  species  ]»ublished  by  former  authors.  Un- 
fortunately, most  of  these  s'pecies  were  described  withotit  any 
re}>:ard  to  the  most  essential  iicniM-ic  and  specilic  clniracter.s,  so 
that  only  in  a  very  few  cases  have  I  been  al)Ie  to  identify  them.  I 
have  preferred  not  to  use  specific  names  the  identification  of  which 


I 


.■'.••' 


ftlifrii"  •■' 


ii 


■;■  ^M 


'•  1 


Ti 


imikk.\(;k. 


WHS  not  (|nitc'  cortnin,  as  this  wtmld  only  liavo  iiici'cnscd  llin  cnn- 
Tiision.  ir  the  identity  of  one  or  tlii'  other  of  the  species  iiul)lislie(l 
l»y  me,  willi  a  previously  deseril)ed  one,  should  he  satisfactorily 
|>roved,  I  will  always  be  ready  to  grant  to  the  older  luiine  the 
priority  over  mine. 

11.   LOKW. 

Musrmr/.  Jiilv  I.  18ti:i. 


Rkmai!K>.—  I  liavi'  ;i  I'imv  words  to  add  n^sjiL't-ting  the  transhitiou  of  tlii.-> 
work,  wliicli  was  done  under  my  rare.  The  terniiiiolii^'v  used  ha:^ 
througlioiit  been  tliat  adopted  iu  tlio  first  volume  of  these  •  Monoi,'raplis.'' 
The  term  onttniinl  liristli-  ahme  has  been  replaced  by  tiie  shorter  one,  nrisln, 
used  by  Kiiplisli  writers.  It  will  perhaps  not  be  amiss  also  to  explain 
the  sense  of  tlm  terms  furc  and  /<//«/  and  their  dilt'erence  from  niiterior 
and  poMerlor  when  npplie<l  to  the  feet  or  parts  of  the  feet. 

]iy  foil- /<■! i  Ccox;e,  femora,  tibi.-e  and  tarsi),  corresponding  to  the  (lerman 
vordvrMv  Belni  anil  the  Latin  jnJis  until  i,  is  meant  the  y/c>/  /lair  of'/i'<f 
(or  coxte,  etc.). 

Hy  (intiri:tr  /'(ct  (eorrespondinp  to  vordircii  lieirir,  jirdat  iintrrinris),  the 
lira  Jirst  /•((//•v  are  to  be  understood.  In  this  case,  however,  in  order  to 
avoid  all  possible  misunderstanding,  Mr.  Loew  has  almost  always  used  tie- 
expression  "  l/ic  fmir  iinh  rior  /'i  >  I."  which  was  retained  in  the  translation. 

Tht'  same  rule  apjilies  to  lilml  (liinln-.^li',  jwnliri)  as  indicating  the  last 
pair,  and  y/i//.  r'nr  {/iiiii<i'  .  jinsti  i  i'l|■^s)  meaning  the  two  Inst  pairs. 

OSTKN  SACKKN, 


m 


m- 


m£ 

S*';  •'• 

•^il 

W-'-^f 

:^l 

m* 

v*  *■  V 

■i:-t 

-  «-j 

M 

k. 

TAHLK  OF  CONTMNTS. 


VI.     ON  TIIK  NORTH  AMKUICAN   DOLICllol'ODID.i;. 


I'rel'aci'       ......... 

IiitrixliKttioii       ........ 

Tal>lH  for  tin-  ili'tfriiiiiiaticiii  u\'  tin-  (ifiifra         .         , 
Tal)ln  for  (lie  svstt'inatic  arramtemt'iit  of  tlu*  (iciu-ra 


PACK 


(Ji'ii.  I.  HYl;U(l('l.:I,l•;^•■nI^^< . 

1.  latipes  /,(/■.   ^  .  9 

(ten.  II.  DoMi  iioi'i's 

1.  gratiis  f.w.   I, 

2.  laticoriiis  /,»•.  ^  , 

'.i.  si'tifer  Aw.   >_,         .         . 

4.  alljiciliatuH  /.i".   9 

f).  .\aiitlioeiit>imir»,  n.  s.  J, .  "^ 

6.  tetricus,  iiov.   sp.   1  .^ 

7.  ncuiniiiaturt  /.«•.  "^  .  9  • 

8.  ovatiiri  /,ir.  ^ 

i).  pachycnciiuis  /.u\  %  .  9 

10.  brevip«niiis  Mii;/.  %  .  9 

11.  loiigiiiianus  /.ir.  ^  .  9  • 

12.  breviuiatius  /-//•.   Tj 

13.  soeiuH  I.ir.   'J, 

14.  muiKlus,  iiov.  sp.  ^.9 

15.  snbciliatus,  iiov.  sp.   % 
IG.  splen(liilnr>  /.w.  ^ 

17.  batillifer  Lw.  ^.9 

18.  euilactylus  f.w.  %  .  9 

19.  tonsus  /  ir.  ^  .  9  • 

20.  tener  Lti\  % 

21.  variabilis  f.w.  %  .  9 

22.  luteipeiinis  f.iv.  % 

23.  raraift-r  Lw.   %  .  9 


•24.  bifrnctus  /,«•.   'J, .  9 

'2:<.  vitl.itus  Lir.   Jj     . 

-il.  fii[)rimis  W'icil.   J, .  9 

27.  loiiu'ilifiiiiis  Ah-.  ■J, ,  9 

2s.  hastatiis,  iKiv.  sp.  J, .  9 

2it.  piiiiiiipt's  .S'i')/>.   J, .  9 

.SC.  flllvjpt'S   Ah\    'J,       , 

HI.  st'sarticiil.'itus,  n.  s.    J, 

:52.  rufu'oriiis  Aic.  %  . 

;i:?.  scapularis  Aw.  ^  .  9 

lU.  fumlitor  Lw.  ^  .  9 

;{t'5.  chrysostoinns  Aw.  "^ 

;5il.  i)r.'i'ii.stus  Aw.  %  . 

i^7.  coniatua  Aw.  ^  .  9 

38.  SL'oparius  Aw.  % 

3f).  vliscift'r  .S/(/));i.  'J, .  9 

40.  lol)atiis  Aw.   '^ 

41.  si'tostis  f.w.   ^ 

42.  incisuralis  I.w.   J, .  9 


18 

2i) 
21' 

r.ii 
:ii 
:!i 
:v.\ 
34 

35 

37 

38 

39 

'IJ 

41 

42^ 

44 

4.')    Gen.  III.  fivM-Noi-TKiiMS  . 


4(J 
47 

40 
.50 

ni 


1.  llaviis  Aw.   l  .'{■  . 

2.  subulatiis  A?c.   %, 

3.  scotias  Ah'.   )j  .  9 

4.  barl)atiilus  f.w.  %  .  9 
.5.  tristis,  nov.  sp.  ■Jj .  9 
(!.  exilis  Aw.   ^ 

(  vii  ■) 


I'Al!' 

iii 

1 

11 

14 

I'ACK 


Ml 
III) 
(il 

(;2 

()3 

f;4 

•17 
(18 
()9 
70 
71 
72 
?•! 
74 

~:> 
so 

si 

82 
S3 
S4 


'''.»■ 

r|i; 

'■  '-Hi 

•'   ^'^  1 

;'|^,;- 

'■'1 

\* 

!:i 

" 

■ 

■   a 

^::M 

i; 

•   ■    !!»•:! 

't' 

■  .!,'"'  i- 

1'' 

! 

1 

VIII 


TAIU.K  or  t(t.NTK.NT:«. 


7.  >|M-<tiibllis  l.w.   V 

h.  nlliii!i'|is  l.w.   9     . 

!>.  tsiiliililatatiiH  l.ir.  ^ 

111.  lii'Vigaliis  l.w.    ^ 

1  1.  tHM|lll'llS    l.w.     Jj  .  9 

ll!.  luiiitcr  /."'.    1, 

lit.  rmiliiiatiis  /./(■.    5, 

14  di'spicaliis  /,//•.    )j 

IT),  .lilli.ilis  l.w.   1      . 

11).  iiii;iil)arlius  l.w.  9 

17.  iiarviiMiinis  l.w.    ^ 

18.  iipariis  l.w.    Jj       . 
111.  piililiis  l.ir.    9 
•JC.  .Ifliilis  /.(/•.    [,.9 
21.  i-rassicauila  l.w.  J, .  ' 
2'i.  ininulus  /.fc   ^    . 
23.  vfiitralis  /,»■.   J,  . 


«M!11.    iV.     I'.\l!.\(  \.\V.i 

I.  aii'iiatus  /,((•.  9 


PAIIK  r\..K 

>>.')  iliin.  Xn.    DmnruAi  urt       .  .  I2i" 

>.1            1.   |iia«iiiurt  Aw.   ^.9  .  121 
8lj 

h7  U.'ii.  XIII.   Ani;i'hii-(*        .  ,  12:; 
s,s 

H!l  (it'll.  XIV.   .AiKiviiA           .  .  12;l 

"•ll             i.   ailii.aii-s  /,(/'.    Jj.  9  .  12.^ 

ill  I            2.   nii;ri|M'.-<,  iiov.  Kp.   \,  ,  127 

01             It.   aliiivfiitiis,  iiov.  np.  J^  I2> 

!»1            4.   iiiiiiiita  l.w.  I       .  .  12!l 

.  l:H' 

.  i:»l 


ill 


.1.   calci 


ll.    ca 


trails  l.w.   ^ 
I. •rata  I  w.   9 


1)4 


I.     CVIUK 


liii'a, 


IKIV.  s 


p.  I   .      1: 


•'■'    (icii.  XV.   Syntohmon 


(l.-ii.  XVI.  ,< 


VNAIiTIIIMS 


J  It:! 


1 1 '.4 


IDI 


ailioiiotatus,  11.  s.    I,  .  ^      102 


1.  pa'niai  is,  iiiiv.  sp.  'Jj  .  V      ^'•^'' 

2.  I  iiHM't'ivfiitris  l.w.  9     •      '-H 
It.   Itailiatii.s  /.(/■.   ^    .  .     Jits 


<ien.  V.    I'Ki.AsroMMiirs 


1.   1 


ongicaii 


la  l.w.    I 


2.  luijul.ris  l.w.   9    . 

It.  la'tiis  l.w.    }, 

4.  \  au.in-i  /."'.    V  .  9 

,'■).  i'(i.'ii;i|  lis   /.)/'.    9    . 


11)4 


l(i< 


imi 


(icti.  XVII.   Systkm-.s       ,  .      )H1I 


(Jfll.    XVIII.     RllAIMMl'M     .  .        1411 

1.   hiuiinn-  l.w.   9     .  .      141 


(ifU.   XIX.     Xli'llA.NDHIIM  .       14! 


Iil'll, 


\  I. 


ACIIYIKKCIIC; 


•J.    VDl-ax 


c  l.w.   I  .  9 


J  01) 


1.    liiocrliiis  l.w.    Jj  .  9         .      J  1(1 


ril-n.    XX.     l'iiRl'lfYI!()P!<       .  .        14:'. 

1.   iiit'laiii pus  /-((,'.   J, .  9     •      144 


11: 


;t.   aiimistipi'iinis  l.w.    J,    .      111? 


-.   iiiuru'oxiv 
It.    ll 


miiipciiiiis 


l.w.  9 

l.w.  9 


14.'i 

i4i; 


4.   rotiiiiilii'eps  l.w.  ^        .     14' 


lien.  VII.   Ortiiociiim 


114 


(Jell.    XXI.    S.MII.!OTU.- 


14; 


(it'll.    VIII.    SV 11  [STROMA 


(Jen.  IX.   IIercoptomus 


11; 


IKi 


(Ii'ii.  XXII.   Apmrosyi.it.s 


1.  unicolor,  iiov.  sp.    T,     .     117    <leii.  XXIII.  Thinopiiiluh 


I4S 


14H 


ficn.  X.   IIyi'opiiyi  i.v 


lis  iCfii.  XXIV.   I'l-t.DKs 


14f» 


tifii.  XI.   IIai.tkrk  imvj 


11!' I  (it'll.  XXV.   NiMAH'i'iiocTrs 


TAIU.K  OF  (((NTKNTS. 


IX 


Oen.  XXV'I.   liKiVdhTot-.v 
1.  cinguliitii  /.M',   ^ 


Oeii.  X 
1. 

U,.n.  X 

1. 
•> 

S. 
4. 

r.. 
(J. 


XV'II.    Kl'TARslrt     . 
cijUOH,  1IU7.  Hp.    % 

Will.    PlAl'lIOUl'H 

iiiuii'UiH  Alc.  "J, .  9 
siuM'tiiliilis  y.ii'.   ^ 
sodalis  /.«'.   ^  .  y 

l.'lllK-llntllS,   iiov.  Hp.     '^ 
ll-lll'llstolMUS    /,«•.      ^Jj  .  9 

iutt'iruptua  Aif.  '^ 


I'ViiK 

ir.l    (l,.u.  XXXV.   LiA.N(Ai.r«  . 
l.VJ  1.  ^('iiuiiiin  I.w.  ^  .9 


Oen.  XXIX.  I.rito.NKnd'H 
1.  laTulertcens  />«•.   ^ 

Oen.  XXX.  CiiRYsoTrs     . 

1.  cormitus,  iiov.  sp.  % 

'2.  l()iiL:iiii:tnus  /.»■.   ^ 

3.  valiilus  /.»/•.  9 

4.  olili<|uurt  /.«'.  %  .  9 
f).  atliiiirt  Aw.  ^  .  9   • 
G.  vividu.s,  IIOV.  si>. 

7.  <'<>stalirt  /-«•.  ■J, .  9 

8.  sulifOHtatiis,  nov.  sp.  % 

0.  discolor  /ai\  %  .  9 
10.  a  11  rat  ud  J.w.  9  • 
11  i>allipfS  Lw.  '^  .  9 
12.  picticornis,  nov.  sp. 

Oen.  XXXI.  Tkd(  hopiiori?,'* 

Gen.  XXXII.  Sympvcsih 

1.  tertianius,  luv.  sp.  ^  .  9 

2.  frontalis  J.u:  %  .  9 

3.  lint'atus  Lw.  'J, .  9 

4.  nodatus  Lw,  ^  .  9 

Gen.  XXXIII.  Campsicsemds 

1.  liirtipes  Lw.  %  .  9 

2.  claudicans,  n.  s.    %  •'} 

Gen.  XXXIV.  Plaoionei-uus 
1.  univittatus  Lw.  9 


(Jen.  XXXVI.  H.  i:i,u«     . 

1.  .'xiistiis  Walk:  1.  9 

2.  Hpininiaiiiis  /f>fr.    ^.9 
\.\,  avidiH,  iidv,  xp,   ^ 
4.  flliler,  nov.  sp.  ^ 


ir.:i 

1.-^4 

j 

ir.ijj 

i(>(i 

1(11 

lii2 

]tj;i    flen.  XXXVII.  llYiiuopiioiirs 

lOf)  !•  iiir.dtatus,  MOV.  sp    5.9 

Idfj  I  2.  pirata  /."'.   9 

lilg  3.  parvus  /.(/•.  'J, 

''"'••    (Jen.  XXXVIII.  Aciiamis 
17(1  i 


171 
174 

i7r. 
i7r. 
170 

178 
17< 
171) 
l^l 
ls2 
IMi 
18;} 
184 

185 

18;-. 
187 
ls8 
181) 
11»1 

103 
193 
194 

190 
19G 


(ien.  XXXIX.  MKHETEiirs 

1.  niyrip<'s  /.«•.  9     • 

2.  vules  /.(/'.  %         « 

Oon.  Xli.  riinvsoTiMCn    . 

1.  jmsio  /.ir.    9  • 

2.  delicatus  Lw.  9  . 

Gen.  XLI.  XANTiio<uLonrs 
1.  helvinus  Lw.  9    • 

Gen.  Xlill.  SAiTROPrs     . 

1.  diniiiliatus  Lw.  ^ 

2.  rubellus  Lw.  9    . 

3.  sui)erbiei>s  Lw.  X, .  9 

4.  tenuis,  nov.  sp.  9 


Oen.  XLIII.  Psilopus      . 

22'.> 

dillusus   ll'/V./.   'J, .  9     . 

:'.:;.■. 

guttula  Wi<<l.  ^  .  9      . 

2:. 7 

1. 

diuiidiatus  /.w.  ^ 

24^: 

0 

sipho  S,iy,  ■^  .  9 

247 

3. 

scaber  Lw.  ■^ 

-2-)0 

4. 

patibulatus  Say,  '^  .  9  • 

2.'il 

5. 

nielatupus  Lw.  %.2    • 

2 '.3 

G. 

pilosu3  Lw.  % 

2r)t5 

7. 

jucundus  Lw.  %.^ 

25S 

PAilK 

llts 

)9;» 

2i»» 
202 
204 
'-07 
201) 

211 
212 
214 

2i«; 

217 

21* 
2l!i 
2111 

221 » 
221 


223 
224 

224 
22:. 
221; 


!    i\ 


h 


i.J 


n 


<m 


;■  m 


TABLE  OF  CONTENTS. 


8.  filiatus  Lw,  %     .        , 

9.  comatus  Lw.  '  .  9 

10.  clirytioprasius  II'L  ^  .  5 

11.  scobiiiator  Aw.  'J,  •  J    . 

12.  caudatulus  Lw,  ^ 

13.  calcaralus  Liu.   % 

14.  inermia  Lw.  %     »        • 


Species  described  by  previous 
Monograph      .         .         • 

Fahricius,  Si/stcma  Kiitomoloijiic 
Musca  lopgicornis     . 

Ihbriciiis,  Entomolo'jia  nystcma- 
ticii        .         .         .         • 
Musca  longiconiis     . 

Say,  Jour.  Acini.  Xnl.  Sc,  Phil. 

Dolici'opus  miit'asciatus  . 

obscurus  . 
feiiioratus 
Clirysotus  iiubilus    . 

conciiiiiarius  . 

abdoiuinalis  . 
Medeterus  lateralis  . 

punctipeiini3  . 

Dolicliopus  abdoniinali3  . 

WiedeiiKinn,  AHSsernnrop.  Zwei- 
JlUifcl.  lusccten 

Psilopus  macula 
Sayi  . 
longiconiis 
caudatus    . 
virgo 

fetnoratus  . 
mundus 

Dolicliopus  obscurus  S^iy  . 

MacqiKirf,  Siiilps  (I  liuffon,  Dip- 
tdrcs      .... 
Psilopua  radians       . 


PAGE 

P>OE 

2G0 

If). 

scintillans  Lw.  %  .  9 

.     273 

2G2 

16. 

pallens  Wied.  %  .  J 

275 

205 

17. 

variegatus  Lw.  9 

278 

208 

18. 

bicolor  Liv,  9 

280 

271 

19. 

psittacinus  Lav.  %  .  9 

281 

272 

W. 

tener  Lav.  'J, .  9    • 

284 

272 

21. 

filipes  LjW.  1        , 

28(5 

APPENDIX. 

authors,  and  not  contained  in  this 


280 
2S9 


289 
289 

289 
289 
290 
290 
291 
291 
291 
291 
292 
292 


292 
292 
293 
294 
204 
205 
205 
290 
290 


207 
297 


MitKpiart,  L)!p/f'rex  Exotiqiien 
Ptiilopus  sii)ho  . 

radians 
Chrysotiis  viridifemora 
Dolicliopus  heteroneurus 

Wiilher,  Lnsecta  StiiDKleraiinia 
Psilopus  lepidus  '^   . 
Medeterus  exustus  9 

viridiflos  9 
Dolicliopus  bifrons  9 
consors  9 
contingens  9 
liebes  9 
iiieptus  9 
maculipes  9 
pulcher  '^ .  9 
varins  9 

Wall-ei;  List  nf  Dipt.  Brit.  Miis 
Psilopus  delicatus  9 
gemmifer  ^ 
chrysoprasi 
suaviuui 
aniatus  % .  9 
inficitus 
nigrofemoratus 
albicoxa  % .  9 
Chrysotus  incertus 
Porphyrops  pilosicornis   . 
Medeterus  glaber     . 

chrysologus  9 
alboflorens  9 


289 

297 
297 
298 
298 
209 

3(ti' 
3(iO 
3U(t 
301 
3(11 
3(12 
302 
302 
303 
303 
304 
304 

301 
304 
305 
3(i5 
300 
300 
307 
307 
307 
308 
308 
309 
309 

no 


•'■): 


-m-^^. 


■ 


TABLE  OF  CONTENTS. 


xi 


PAOE 

PAOK 

Dolichopu3  afflnis  %,^   . 

310 

Dolicliopus  terminatus  9 

31 G 

cupriuus  ]Vied. 

311 

sequax           . 

317 

lamellipes  % .  J 

311 

soccatus        . 

317 

ciliatus  % .  9 

312 

remotus 

317 

adjacens  J   , 

312 

irrasus .         . 

318 

coerceiif,  %    . 

312 

Orthocliile  derempta       . 

318 

finitus  %       . 

313 

distractus 

313 

Walker,  Trans.  Entom.  Soc. 

319 

discesus  9    . 

314 

Psilopus  unguliveua 

319 

contiguus  % 

314 

solidus        . 

3ia 

exclusus  J   , 

314 

peractus     . 

311) 

confinis  9     • 

315 

hfereticus   . 

320 

conterrainus  ^ 

315 

permodicus 

320 

separatus  9 

31G 

SrPPLEMEXT. 

I.  General  remarks  on  the  Dolichopodidae  of  North  America  .        .     321 
II.  Description  of  some  Species  communicated  after  the  volume  had 


Gen.  II.  DoLicHOPua        . 

43.  dorycerus  Lw.  % 

44.  spleudidulus  Lw.  ^ 

45.  palaestricus  Lw.  %  .  9 

46.  melanoce-us  Lw.  %  .  9 
47*  quadrilamellatus  Lw. 

Gen.  III.  Gymnopternus 
19.  poliins  /,?«.  %  .  9 
24.  pusillus  Lhy.  9    • 
27.  chalcochrus  Lw,  % ,  9 


»              • 

OJ^ 

• 

323 

26.  coxalis  Lw.  %      . 

335 

• 

3?,(J 

27.  meniscus  Lw.  %  .  9 

336 

• 

327 

28.  hnmilis  Lw.  %  .  9 

336 

• 

) 

328 
330 

29.  exiguus  Lw.  9     • 

337 

Gen.  V.  Pelastoneurls  . 

337 

• 

331 

6.  lamellatus  Lav.  9 

338 

7.  abbreviatus  Iao.  •£  . 

2 

338 

• 

332 

8.  alteruans  Lw.  9  • 

339 

• 

334 

• 

334 

Gen.  VI.  PoRPHYROPS      , 

340 

335 

5.  longipes  Lw.  '^    . 

340 

'.  J  '• 


h 


'■  '.,■'■  ■    ■-.         I'Ji 


"  V.    .  ■'1    I  ,  *         i   ■!' 


■M-, 


Explanation  of  the  Plates       .        ,        • 341 

Remarks  on  the  Generic  Characters  explanatory  to  the  Plates    .     345 
Index 357 


y:.-' 


.■■■-*"< 

w 

p 

'r- 

'i^.: 

■^; 

i 

DIPTERA 


07 


NORTH   AMERICA. 


PART     Zl. 


VI. 


ON  THE  NORTH  AMERICAN  DOLICHOPODIDAE. 

IXTROPUCTIOX. 

The  DoUchopndidn:  arc  iiiiKniu-  tlioso  families  of  diptora  which 
show  l)ut  so  few  points  of  rchitioiiship  to  others  tliat  it  is  iiiipos- 
silde  to  name  any  family  of  a  particuiai-  allinity  to  tliem.  A 
superficial  f^huice,  it  is  true,  seems  to  point  out  the  Ephiidrinidtr. 
and  the  genera  of  the  Tnc/n/drimtidtr  in  the  vicinity  jf  (Hiitocvra 
as  the  nearest  to  iha  JJahr/ioiiodiiln  ■  hut  a  clo>;cr  examination 
will  show  that,  instead  of  a  true  relaiionship,  there  arc  merely 
some  points  of  external  analogy  between  them,  jxiints  common 
to  most  insects  (and  not  only  diptera)  jircfcrring  to  live  in  tho 
vicinity  of  water.  'I  he  want  of  a  true  rclatiopship  licconics 
immediately  apparent  when  any  portion  of  their  inner  or  outer 
organization  is  submitted  to  a  comparative  scrutiny.  The  ncura- 
tion  of  the  wings  of  tho  Ihdichniiodidtr  alone  is  so  peculiar  that 
it  is  sufficient  in  itself  to  distinguish  this  family  not  only  from 
the  Ephiidi'iiiidtv  and  the  aliovc-mcntioncd  gi'oup  of  Tachijdrit' 
viidie,  but  als(j  from  all  other  families  of  the  order.  This  neura- 
tion,  together  with  the  brilliant-green  color  of  the  greater  part 
of  the  si)ecies,  renders  the  Doli'cliojtodidfv  one  of  the  moM  easily 
recogiuzable  families  of  diptera. 

The  peculiarities  of  the  neuration,  which  is  shaped  in  general 


:^^ 


i"S»(.' 


'  :i' 


m^ 


■m 


:  -5 


iv;. 


m 


*'j 


DIPTERA  OP  NORTH  AMERICA. 


[part  II. 


accordiufr  to  the  type  of  \]w  IJiptera  aralif/ilvra  (r(»iin»arc  Mono- 
gTiiplis,  etc.,  I,  jjiiu'c  x\iv,  lij;'.  1),  iire  the  I'ollowiiij:,"  in  this  raiiiily: 
Tiie  costiil  vein  extends  iis  lar  as  tlie  tip  of  the  J'onrth  h/n^itndinal 
vein  ;  tlie  auxiliary  vein  does  not  run  towards  tiie  eosta,  hut  to- 
wards the  lirst  lonjj:itudiiuii  vein,  stopping*  (piite  lar  from  its  tip, 
and  either  eoaleseinjj;  entirely  with  it  or  disappearing  without 
huvinfi,'  joined  it.  The  third  longitudinal  vein  emerges  from  the 
.seetuid  not  I'ar  I'roni  its  root,  and  hoth  veins  forni  at  this  phicf  a 
more  or  less  knot-shaped  swelling  ;  the  small  eross-vein  (olleu 
quite  obsolete)  is  at,  or  close  l)y,  this  swelling,  so  that  the  lirst 
basal  cell  is  unusually  short ;  the  diseoidal  cell,  much  narrowed 
towards  its  })ase,  is  eoalcscent  with  the  auterior  of  the  two  small 
])asal  cells  in  couseipience  of  the  ahscuce  of  the  vein  separating 
tlii'm.  The  oosterior  small  basal  cell  (the  so-called  aiuil  ceil)  is 
snuiU  and  .  ••.(■d  at  the  end.  The  sixth  longitudinal  vein  does 
not  generally  reach  the  bonier  ol"  the  wing;  sometimes  it  is  en- 
tirely wanting,  and  in  this  case  tlie  amil  cell  becomes  indistinct. 
The  alar  ai)pendage  (alula)  is  so  narrow  that  it  may  be  considered 
as  wanting. 

Although  all  J)olifh<>j)0(li(l,r  agree  in  the  aljove-dcseribed  pc- 
cnliiirities  of  neuration,  still  this  same  nenration  alVords  very  good 
and  a))undant  characters  for  the  distinction  of  the  geiic'ra  and  the 
species;  the  length  and  direction  of  the  first  longitudinal  vein 
vary  considerably,  the  position  of  the  posterior  transverse  vein 
also;  the  most  striking  characters,  how.ever,  are  t:iken  from  the 
structure  of  the  last  portion  of  the  fourth  longitudinal  vein,  which 
is  sultject  to  considerable  variation,  l)eing  sometimes  paralhd  to 
the  third  longitudinal  vein,  sometimes  more  or  less  convergent 
with  it,  sometimes  straight,  often  curved  or  bent  abruptly  in  the 
midtlle,  or  even  broken.  In  the  latter  case,  the  angle  formed  by 
the  strong  Ih'xure  or  fracture  sometimes  bears  a  rudiment  of  a 
branch-vein,  which  in  some  cases  (as  in  most  Ftiili)pu,-<)  is  long 
enough  to  uudve  the  vein  a])))ear  forke<l. 

For  the  purpose  of  distinguishing  the  Dolichopodidse  from  the 
other  families  t.f  dijitera  the  characters  taken  from  the  neuration 
are  snllicient,  and  it  is  superfluous  to  have  recourse  to  others 
taken  from  the  rest  of  the  body.  It  is  different,  however,  if  we 
intend  to  estalilish  the  natural  character  of  this  family.  I  will 
confine  mvself  here  to  characters  taken  from  the  external  oru-aiu- 
zatiou,  and  as  to  the  internal  one,  1  will  merely  notice  ii.  passing 


INTllOUUCTIOX. 


8 


tliat,  in  accordance  willi  tlic  cxtunial  slriictnro,  it  forms  a  striking 
contrast  with  the  or^'aniziilion  of  all  the  other  dipterous  fainilies. 

Tiie  head  of  tlie  JJulic/iojxMlidtv  in  /j,'eneral  is  more  or  less  he- 
niisplierleal.  Its  sides  are  ocfiipied  hy  the  large,  ovate,  hairy 
oye.':  (naked  only  in  Mfdt /irns),  which  usually  reach  so  far  down 
that  in  most  fi'enera  tlioio  are  no  cheeks  {(jcmi)  at  all,  and  that 
on  the  under  side  of  the  head,  between  the  eyes,  there  is  just  sjjaco 
onoii.n'h  for  Ihe  large  opt-ning  of  the  mouth,  which,  in  some  s[)e- 
cies,  even  encroaches  miiou  a  considerable  portion  of  the  occii»ital 
side  of  the  head.  The  usually  rather  hrt^id  front  l)ears  three 
ocelli,  protected  liy  strong  bristles,  and  several  bristles  in  both 
corners  of  the  vertex;  the  ri  niainder  of  its  surface  has  no  bristles. 
The  frontal  fissure  and  Innnle*  are  indistinct.  The  anteniue  are 
three-jointed,  of  very  dill'ei'ent  structure  in  dilferent  gCMTa,  luiy 
even  often  in  the  sexes  of  t'>"  same  species;  the  second  joint  i^^ 
sometimes  rudimentary.  Tiie  arista  is  two-jointed,  seldom  alto- 
gether bare,  generally  with  a  very  short  pubescence,  more  seldom 
fringed  with  longer  hairs  or  even  plumose;  its  dorsal  or  aiucal 
position  aiVords  very  constant  distinctions  between  dilferent  gene- 
ra ;  its  length  and  the  other  characters  Ijclonging  to  it  diller 
sometimes  even  in  the  two  sexes  of  the  same  species.  The  face 
is  usually  vertical  and  smooth  ;  it  has  often  on  its  inferior  third 
an  elevated  transverse  swelling,  or  at  least,  on  each  side,  near  the 
orI)it  of  the  eye,  a  nodule-like  elevation;  seldom  does  the  face 
reach  (h)wn  to  the  iid'erior  angle  of  the  eye;  it  is  always  without 
any  bristles,  althongli  sometimes  it  is  hairy;  its  lower  edge  \a 
rather  sharp,  and  does  not  coalesce  with  the  border  of  the  mouth  ; 
from  nude"  this  i!^])^'  project  the  single-jointed  palpi,  incumbent 
ujton  the  pr(»boscis  (except  in  ^lji/iri)^i/hi,-<,  where  they  hang  down 
on  its  sides)  ;  they  are  usually  scale-sluipcd,  iii<»re  seldom  lancet- 
shaped  (for  instance,  in  Or/lmi-lii/r)  or  round,  pallet-shaped  (in 
DioKlractiK)  ]  in  the  females  they  are  usually  cousidci'alily  larger 
thai)  in  the  nmles ;  sometimes  however  (in  l)iu.^fr(ict(!<),  the  oppo- 
site is  to  be  I'ound. 

The  ])roboscis  is  generally  short  and  (with  the  exception  of 
A/i/irosi/lii.'i  and  Orf/ioc/nlc)  stout;  its  upening  is  wide,  more  or 
less  surrounded  by  the  jn'otuberant  suctorial  lh)i»s,  which,  by  elap- 

*  For  the  explauatiou  of  these  terms,  compare  MuiKujinjihs^  Vol.  I,  p.  xii» 
— O.  S. 


!', .  '"'i 


!'.'.. 


i 


r! 


Dll'TKUA  OF  NOIITIT  AMF.UICA. 


[part  II. 


^•ing  together,  slint  tlic  opciiiiifj ;  the  species  of  the  genera  with 
a  largo  i)rul)()scis,  esi)eeiaiiy  their  feiiiales,  can  altogetiier  engulf 
siuiiil  inserts  within  tiieir  i)r(»boseis,  as  if  they  swalhnved  them, 
whereas  they  only  suelv  them  out  iMid  throw  the  reimiin(h'r  away. 
Tlie  liorny  i»arts  of  tlie  moutli  are  short.  The  stout  hiliruni  luis 
on  its  hiteral  edge,  whieh  is  Ix'ut  (h)wnwards,  several  deep  incisions, 
thus  forndng  stnuig  teeth.  The  tongue  is  longer  than  the  labrum, 
and  lies  under  it  without  being  encased  in  it. 

The  u|>per  side  of  the  thora.x  is  convex,  witli  bristles  inserted  in 
rows,  Itetween  which  there  are  more  or  less  numerous  short  hairs; 
in  some  genera  there  is  a  flat,  some\\hat  concave  declivity  before 
the  scntellum.  I'rothorax  and  niesolhorax  are  very  eoalescent ; 
no  distinct  collarc  is  |)ereeptible,  and  the  humeral  callosities  are  nut 
sharply  limited  ;  of  the  ordinary  transverse  suture  only  the  begin- 
ning is  indicated  on  both  sides  by  a  large,  '.lore  or  less  triangular 
impression.  Scntellum  with  two,  four,  or  six  strong  bristles ;  more- 
over, its  surface  is  sometimes  hairy.  The  elongated  protlujraeic 
stigma  is  closed.  Innnediately  above  the  basis  of  the  fore  eoxaj 
there  is  a  strong  bristle,  seldom  several.  The  metathoracic  stigma 
is  unusually  small.  The  epimera  of  the  metathorax  have  a  very 
large  development;  they  endtnice  often  the  basis  of  the  al)(h)meu 
from  the  side  to  a  considerable  breadth,  and  extend  as  a  narrow 
stripe  along  the  basis  of  its  uj)per  side. 

The  abdomen  of  tiie  female  has  seven  segments,  the  last  two  of 
which  are  generally  very  narrow  and  contracted  under  the  pre- 
ceding ones,  so  that  only  five  segments  ap])ear  on  the  outside  ;  the 
sevenMi  segment,  in  the  fenuile,  bears  on  its  end  two  snudl  lamellie 
connected  with  it  by  an  articulatit)n  and  fringed  with  hairs  ;  above 
them  there  is,  in  many  species,  a  fau-shajied  row  of  short,  stiff, 
thorn-like  bristles  ;  in  other  species  the  number  of  these  thorns  is 
reduced  to  four  or  two;  sometimes  they  are  altogether  wanting ; 
the  latter  is  es))ecially  the  case  with  those  species  whieh  prefer  dry 
localities,  or  also  those,  the  hind  part  of  the  thorax  of  which  has 
a  flat  usually  concave  declivity;  this  difference  in  the  structure 
of  the  ovipositor  has  certainly  some  relation  to  the  difference  of 
the  locality  where  the  eggs  are  deposited ;  it  is  possible  that  a 
complete  fan  of  thorn-like  bristles  coi\stitutes  a  peculiarity  of  the 
si)ecies  the  larvie  of  which  live  under  ground,  whereas  it  is  wanting 
when  the  eggs  are  laid  in  decayed  wood. 

The  abdomen  of  the  male  can  also  be  considered  as  consisting 


INTRODUCTIO.V, 


of  seven  sepiieiits,  if  tlie  liyjio]iyii'iuiii  lie  ('(lusidered  iis  a  sin<;le 
se;i'iiieiit ;  of  tlie  sixth  se;;'iiieiit  only  the  u|t|iei'  liiilf  is  distinctly 
(leveliiped,  hilt  it  is  niiieli  narrower  niid  sliurter  lliiin  llie  siirlaeo 
of  tlie  iiMiiiediately  iinwediiiji'  seji'ineiits.  \\'lien  this  sixth  seu'ineiit 
Is  eoiicealed  under  the  ujtper  half  (»f  the  lifth,  or  when  it  is  strik- 
iiiii'ly  diil'erent  hy  its  eolDi'ing'  fri.'in  the  iti'eecdiiiji"  seti-ineiits  and 
resenil)les  in  this  respect  the  seventh,  then  the  male  alMldineu 
appears  only  live-jninted.  'JMie  seventh  scj^nient  cimsists  of  the 
proportionally  larn'e  hi/jinpi/ijium,  the  structure  of  which,  near  its 
basis,  is  not  (piite  syninietrieal.  It  consists  of  a  rather  stalU-liko 
hasal  part  and  of  a  clnh-shaped  jHisterior  part  ;  the  stalk-like  part 
is  often  very  ninch  al)breviated,  and  then  not  easily  jterceptililo  ; 
the  cluh-shaped  part  is  nioval)lo  towards  it  ;  the  Jiinctioii  of  hotli 
])arts  lies  always  above,  on  tlie  left  hand  side  of  the  clul)-shaped 
portion. 

The  liyitopy.ti'iiini  is  more  or  less  inflectecl  under  the  alidomen, 
sonieiiines  indjedded  in  an  excavation  of  the  venter  proportionate 
to  its  size.  At  the  tip  of  the  indected  hypopyuMiim,  belnv,  are 
inserted,  l)y  means  of  articulations,  three  pairs  of  appendages  of 
The  outer  jtair  of  these  appeiidau'cs  is  u'eiie- 
the  two  others,  anl  must  1 


manifold  structure 


ruliv  larger  tiiaii 


wootliers,  aiit  must  be  coiisidereu  as  orpins 


of  a  ,u'reat  irritability,  as  the  roots  of  the  hairs  on  their  inside  arc 
connected  with  nerves.  'I'he  liasis  of  this  pair  is  linked  to  the 
hyjxipyu-iiim  by  a  free  articulation.  The  two  other  jiairs,  attaclnd 
))y  u  less  free  articulation,  can  be  considered  as  oru-ans  for  the 
])uri)ose  of  seizinu",  clutching';  they  lie  within  the  former  pair  and 
are  not  .seldom  of  a  very  complicated  structure.  Sometimes  one 
or  the  other  of  these  j)airs  exceeds  in  leiiji-th  the  outer  pair.  Iii- 
U'rmost  betw<'en  them,  coincidinj;  with  the  middle  line  of  the 
tlutchiii,t!;  ajiparatns,  a  sinu'le  aj»i)enda,L;'e  is  inserted,  which  also 
appears  to  be  linked  at  its  basis.  On  the  upper  side  of  the  hvpo- 
jtyji'lum,  which  is  the  side  turned  towards  the  abdomen,  there  are 
two  more  ai)[)enda,ti'es,  usually  in  the  sha|)e  of  a  jrutter;  they  have 
no  link  at  their  insertion.  Above  this  <:iitter,  (U',  more  seldom, 
within  it,  is  aiiotlier  appetida.ti'e,  in  the  shape  of  a  spike,  which  in 
some  eases  is  somewhat  button-shaped  at  the  tip;  it  is  pierced 
lenjithwise  by  a  channel,  and  incloses  mm-e  or  less  con  pletely  the 
]K'\\\ti,  which  prcttrudes  considerably  diirinji-  the  act  ol  copulation. 
This  orsranizatiou  is  most  distinctly  de 


)pe 


Doli- 


chojius,  whereas  it  is  more  dillicult  to  observe  in  the  genera  with 


*■■■.'. 


.'iff  ii.-i 

Aft 


.    ,;      ( 

"."  a- 
■"•.  I. 


■  1    i 


'■^A 


i!i  I 


6  DIPTKIIA  OF  N'OUTII  AMEIUrA.  [PART  IL 

n  small  niul  iinlxddctl  liyiinpy^iiiiii.  In  soino  frcncra  llic  one  oi 
the  otlicr  of  tlic  j)iiirf(l  orjifiiis  tire  so  snuill  as  to  cscaiJO  notict'.  A 
further  and  more  llioroniili  invt'stifi-ation  lias  as  yet  to  show  whe- 
tlicf  in  sonn'  ^i'cncra,  ami  tliis  seems,  for  instanee,  to  lie  the  easo 
with  llijitdjilnjUus,  a  still  larg-er  iiunil»er  of  a|)i)en(la,uTS  <loes  not 
oeeiir,  ami  whether  in  ji'cneral  tiio  orti'anization  of  all  the  g-eneni 
can  he  re(liiee([  to  the  common  type,  descriheil  ahove. 

(M"  the  lirst  aiMhnnimil  seji'inent  often  only  the  upitor  half  is 
]»eice|ttil)le  in  the  nmie  and  the  fennde ;  this  is  cs])e('ially  the  caso 
in  those  g-em-ra  in  which  the  viddlhorncir  cjnmera  cover  a  con- 
siderahle  hrciidth  (tf  the  hasis  of  the  alidnnu'ii;  in  other  fi'enera 
the  inferior  half  of  the  seu'nient  is  iniwh  shortened,  and  in  a  \'(.'\y 
eases  only  ccjual  in  leiiu'th  to  the  upper  half.  In  several  jrenera 
the  lateral  nnirij,'in  of  the  sectmd  and  of  the  fidlowing  segments 
shows  deep  punctures,  arrang'ed  in  a  longitudinal  row. 

The  fore  coxa',  which  are  somewhat  distant  from  the  middle 
ones  and  ])laced  miu'li  higher  than  those,  arc  also  longer,  and  reach 
as  far  as  ahnut  the  middle  of  the  latter.  The  feet  are  in  geiu'ral 
slender,  the  hind  pair  generally  longer  and  stouter  than  the  others  ; 
the  femora  ai'(^  often  rather  strong.  Besides  sliort  hairs,  the  feet 
l)ear  usiuUly  a  numher  of  stiff  bristles,  especially  the  tihiic.  The 
pulvilli  are  oidy  of  moderate  size;  the  em|)  idium  is  linear  and 
always  distinct;  the  claws  (idu/ik's)  are  plain  and  small. 

"We  have  already  e.\|)lained  above  what  is  necessary  for  the 
iinderslanding  of  the  very  characteristic  neuration  of  the  wings. 
The  snrl'ace  of  the  latter  is  microscopically  hairy  upon  its  Avhole 
extent.  The  teguho  are  ciliated  with  bristle-like  hairs,  and  some 
snuUler  ones  besides;  they  are  simide,  as  the  inferior  duplication 
is  wanting  or  only  a])iiarent  as  a  narrow  membranous  stripe  ex- 
tending towards  the  corner  of  the  scutellum. 

The  sexes  of  the  same  si)ecies  show,  besides  the  difference  in 
structure  of  the  genital  (<rgans,  other  important  difl'erences  in  their 
organization  ;  the  coloring  of  the  same  parts  of  the  body  is  often 
different.  Here,  as  in  many  other  families,  it  is  in  the  male  sex 
that  these  peculiarities  assume  the  character  of  variously  modiiied 
ornaments,  and  it  seems  impossilde  to  trace  any  relation  between 
them  and  the  sexual  functions  or  the  sustenance  of  the  male.  The 
only  exception  in  this  respect  is  afforded  by  the  considerable  dif- 
ference in  the  structure  of  the  parts  of  the  mouth,  which  is  much 
more  developed  in  the  females,  in  accordance  with  their  greater 


INTUoniTTIO.V. 


need  of  f((o<l,  and  cuiiscfpu'iitly  tlicir  mure  j)i'i'(l!i('<Miiis  liabit^.     Tlu; 
j)liistic  (lillV-roiicfs  (list inu'iiisliiiijr  tlic  male  sex  rroiii  iUv  (itlicr  iiiuy 


10  f'Vi's  <>[ 


tl 


10  iiiiilo  ar(!  ":oiH'riillv  snuio 


1)0  (U'liiiod  as  ruUuws  :  _ 

wliat  lai'^or,  ilie  faco  and  sonicliinos  also  llio  front  narrower;  ilio 
contijruity  of  tlio  oyos  in  tlic  iinilo  is  not  fro(|iH'nt  ;  still  it  takes 
place  in  some  J)iopJiorns  al)ovo  tlio  antonnu',  and  in  some  (Hir;/- 
t!o/tis  ))elo\v  tlieni.  Tlio  third  Joint  of  the  antenna;  of  the  male  is 
lisnallv   soniewhal    lon"'er,  sometimes   iiineii   l.n'ucr  than    in    the 


female;   likewise  the  antennal   arista  of 


.0   male    i,- 


il'ten   nnieli 


2)i'olon,n'ed,  S(jinetimes  extended  into  a  ehd;  or  hiitton  at  the  tip  or 
t'uiarjjfod  in  tlio  sha])e  of  a  lanu'l,  whereas  in  tlie  fenndo  the  arista 
is  mnch  shorter  and  (init(;  plain.  The  feet  of  the  fenmles  ai'e,  almost 
withont  exception,  plain;  those;  of  the  nuilo  ol'ten  dilVer  eonsider- 
, ably  from  them,  and  hav(,'  varions  handsome  ornaments,  principally 
on  the  fore  and  ndddlo  tibia',  and  the  fore  and  nnddlo  tarsi;  the 
femora  as  well  as  the  himl  tibia'  and  tarsi  very  seldom  show  any- 
thing imt  a  plain  structnro.  To  these  diil'erences  in  the  strnctnro 
of  the  feet  ninst  he  added  those  derived  from  the  hairs  and  bristles 
which  they  bear;  in  the  fenndo  these  aro  nsnally  more  sparse, 
shorter,  and  coarser;  in  the  nnde,  closer,  more  delicate,  and  lonu'er; 
sometinu's  also  they  assume  in  this  sex  some  peculiar  modilled 
structure.  Even  tlu'  ungues  of  the  nude  are  sometimes  of  a  pecu- 
liar irregidar  shape;  the  pulvilli  aro  in  some  cases  (as  in  /h'djihu- 
rus)  larger  in  the  nnde  than  in  the  fenmle.  The  wings  of  the  nude 
often  dilfer  from  those  of  the  fenndo  in  the  outline  and  the  neiira- 
tion,  those  of  the  latter  being  in  geiu'ral  nu)r(!  jdain,  and  repro- 
ducing in  their  neuration  the  characters  common  to  the  genus; 
\vliereas  the  wings  of  the  male  show  in  both  rospoots  more  speeilie 
l)eeuliai'itics.  These  consist  u-iially  in  characteristic  sinuses  of 
the  posterior  margin  and  in  a  stronger  sweej)  of  (lexnre  of  the 
longitudinal  veins ;  somctinu's  the  anterior  nnirgin  also  shows  a 
])ecnliar  curve  in  its  outline,  or  a  local  thickening,  or  an  elegant 
fringe  of  hairs,  all  of  which  do  not  exist  in  the  fenndo. 

The  hairiness  of  the  eyes,  as  well  as  the  hairs  and  bristles  on 
the  other  ])arts  of  the  body,  is  fretiuently  more  dense,     ften  con- 


sideral)ly  longer  in  the  male  than  in  the  fenndo.  Tin;  very  nnnute 
and  dense  lomentum  with  a  silvery  refloctictu,  -which  adorns  the 
abdomen  and  the  thorax  in  most  species  of  .Inji/ra,  also  forms 
spots  on  the  thorax  of  some  other  genera  (as  Pelaaloneiwux)  and, 
in  the  species  of  most  gonoia,  is  perceptible  at  least  on  the  lateral 


i'-;l 


■.■■,1 


'f 


IV-' 


i-    'IS;* 

t ' '  ! 

!:,  -j; 


i!Vh  i; 


<  ll 
I- 


I  I 


\-i 


\  f 


•v 

r* 


8 


MI'TKUA  OF  NOUTII  AMKUICA. 


[part  ir. 


liiiirjfiiis  of  tlie  ulMlitiiicn,  is  likewise  freiienilly  iiioi'l'  exteiuled  ami 
liiiieli  denser  in  the  iiuiles  tliaii  in  tiie  feiiiiiles. 

The  sexual  dillrreiiees  in  the  cdloriiij;  may  he  <]esei'ilie(I  as  Col- 
lows:  The  eyes  of  (he  male  are  fre»|iieiilly  of  a  dilVereiil  eolur  than 
tluise  of   the  female,   ]iai"l icnlurly  so,   for   instance,   in   the  ^^enu^ 


JH 


KIDluU'llS. 


The  enhiruement  of  the  antennai  arista  in  the  nnilu 


instance,  in  an  entire  ^iTonp  of  species  of  /'.'<ilii/>Uft,  (hey  are 


often  has  a  dilVereiit  eoiorin;;,  nsnally  white.  The  color  of  (he  face 
in  tilt.'  nnde  is  !:'cneriilly  of  a  pnrer.  often  a  lii'iiihter  siiade.  In 
many  specie>,  (he  hallercs  tif  l»oth  sexes  are  colored  dlll'erently — 
for  " 

M.ick  in  tin-  male  nnd  yclhtw  in  the  fennde.  I^ven  the  cilia  of  (ho 
tesinhe  have  in  a  few  instances  (as  in  sonu'  species  of  J>nlir/iu/>((s) 
IV  dilferent  colorinji'  in  the  two  sexes.  Diifci'cnces  in  the  <Mi|orinj!; 
of  the  I'cet  are  not  rare;  they  are  especially  slrikin^if  in  the  ii'cnn.s 
I'Kilttjttift,  some  species  of  which  have  altojie(her  yellow  feet  in  (ho 
fennde,  and  Mack  femora  in  (he  nnde;  in  others,  (he  pale  coloring 
of  (Ik'  feel  is  more  ex(endcd  in  the  female  than  in  the  nude.  The 
ornaments  of  the  feet,  pccniiar  to  the  nndes,  also  dilTer  in  their 
eolurinji'  from  the  eorrcspondin};'  parts  of  the  feet  of  the  other  sex, 
lu'inji;  usiudly  Mack,  sonn-tinu's  whitish,  or  with  a  hamlsonie  silvery 
rellec(i(Mi.  Kven  wideid  displaying'  any  pcenliarity  of  s(rnc(nre, 
the  fee(  of  (he  nnile  have  sonn'linu's  white  or  silvery  spo(s,  which 
lire  wantintr  in  (he  fennde.  The  winuv  are  in  some  cases  pic(nred 
in  (he  nude  and  no(  in  (he  fenmle.  8nch  are  sonn'  species  of 
J>i)h'ch(>iii(.i,  Tfirfii/lrrc/iKs  and  Si/filcnus,  (he  males  of  which  have 
11  black  or  white  spo(  a(  the  (ip  of  (he  winii'  or  in  i(s  jiroxinnty, 
whereas  tlu!  fennde  does  not  show  any  trace  of  snch  a  spot.  The 
same  pcenliarity  oecnrs  a!s(»  in  some  other  iz-enera. 

These,  often  so  ('(ms]»icnous  dilferences  l)e(ween  (lie  sexes  of  (he 
same  species,  somedmes  render  the  rccou-nidon  of  (heir  speciiie 
iden(i(y  somewhat  dillicnlt.  In  order  (o  proceed  in  such  cases 
with  some  deu,-ree  of  eertaintv,  it  is  necessary  (o  i)av  a  pardcniar 

>^  «.    '  till 

attention  to  those  characters  winch  are  usnally  common  to  both 
flexes.  The  most  reliable  characters  of  this  kind  are:  the  inurs 
m\  the  antennte,  especially  on  the  first  joint ;  the  shape  of  tlie 
second  antennai  joint;  the  |»osition  of  the  arista;  the  color  of  the 
cilia  on  the  inferior  orbi(  ;  that  of  the  cilia  of  the  tejrnhe,  iiotAvitli- 
standimj  some  exceptional  cases  of  its  diversity  in  the  two  sexes. 
In  most  jrenera,  to  these  charac(ers  nniy  be  added  (he  colorinj^  of 
the  feet  and  of  the  ludtercs  as  well  as  the  neuradou  of  the  winjrs. 


INTUODUCTION.  9 

Tlic  firsl  twi)  (tf  tlicsc  cliiii'iicti'iN  will  Ir.inlly  ever  iiiisIciKJ,  if  it  i.-i 
ItDriic  ill  iiiinil  lliut  llicv  liiivo  lu*  value  in  lln'  jiciiiis  I'.<ili>/>iit<, 
(•s)ii'('iiilly  ill  tli(^  siilxlivisidii  with  Ithu-k  cilia  on  tin-  It^iiilii'.  As 
l(t  till' latter  cliaractcr  (iicnralinii)  it  slioiild  Itc  reinrinliernl  iliat, 
the  periiliaritios  strikinji'ly  »k'Vi'l(»|»('(l  in  tlie  males  as  >|»eeilic  marks 
uru  but  .--liti'litly  indirated  in  the  female,  and  eaii  he  perceived  only 
l»y  a  very  close  oliservation. 

'I'ho  \m\nl^{i\'  \\\{;  J fnlic/iiipDilid/i  are,  as  far  as  known,  ^•crierally 
])rc(hieeous.  ^I(»st  ttl'  them  hunt  I'or  sinallei'  diptera  or  oiher  in.-ects 
with  soft  bodies  and  suck  thcin  (.mt.  They  are  usually  rotiml  in 
dani|)  jihiccs,  covered  with  a  rich  vcLi'cialion  ;  many  are  jiriiicipally 
loniid  on   the  leaves  of  a(|initic  |(laiiis,  on  slmies,  jiaiMly  overlloun 


with  water,  on  dams  and   near  walerla 


II- 


sonie  ol   tlieni  are  able 


to  run  rapidly  over  the  water  even  when  it  is  rippled  by  wind 
{//i/(lr(i/i/i(>ni.t) ;  other;  are  fond  of  salt  or  brackish  waters 
(Aji/irnsi/h/.-f,  Tliiii<)[iliih(!<  and  some  /fi/-h'iiji/inrii.-<) ;  the  species 
of  Mfdifrriis  prefer  dry  situations  and  are  found  on  stumps  of 
trees,  fences,  etc.,  even  in  verv  drv  and  hot  weather. 


Litt 


0  is  as  yet  known  about  their  ino(Ie  of  transfoi'inalioii. 
?t?ost  species  live  as  larva' under  theu'roiind;  «oine  are  f  Mind  in 
the  earth  collected  in  hollow,  rotten  stumps;  others  (as  ,S'_//,s/c//»,>) 
in  wood  underu'oiii<i'  a  process  of  dry  di'cayinu'. 

After  all  that  has  hceu  said  above,  the  natural  characters  of  the 
J)nliclii)ii()(liihr  may  bo  })Ut  down  as  follows  :  (Jeiicrally  metall;(; 
fi'i'eeii,  l)risk  and  restless  diptera  of  small  or  nieilinni  size,  pre(la« 
tory  on  other  insects  and  liviiij;'  principally  in  dami*  situations; 
the  male  sex  are  ]trincipally  distiiiuMiished  from  the  females  by 
dilVereiices  in  the  structure  of  the  feet  ;  the  larvic  livinir  under 
fi'roiind  or  in  decayiuir  wood.  Head  hemispherical,  eyes  larji'e, 
usiiallv  Dot  coutiu-uous  in   both  sexes,  hairv,  feiici'd  iti,  aloiiu,-  the 


hind  border  with  a  row  of  bristles  or  hair; 


Front,  with  bristles  on 


the  vertex  onlv,  and   with  three  ocelli.     Anteiiiia!  strctche(|  out 


strai 


rht, 


wi 


th  a  two-jointed    arista.       Face,    without    mystaciiif 


bristles;  its  inferior  border  not  meri:Mn<r  into  the  lateral  itorder  of 
the  mouth.  Oral  openinir  occupying-  the  wlado  underside  of  the 
liead,  and  often  also  a  considerable  j)ortion  of  its  hind  ]»Iane. 
I*i'o1)oscis  short  and  stout,  concealed  above  l»y  the  sinu'le-joiiitcd, 
usually  scale-shai)ed  palpi,  with  a  wide  openini!,'  which  can  be  .-hut 
by  tho  protrudinj;-  suctorial  flaps.  Labruni  short  and  stout,  with 
coarse  tooth-like  excisions  on  the  sides;  lin":ua  uuicli  more  .sleniler 


J  '.  '  'km 


j, '  * 


■■;iii| 

■  w\ 


''X 

I 


10 


PIITKRA  OP  NORTH  AMKUtrA. 


[PAllT  11. 


It-, 


I* 


V 


•I,  ■  ,;, 


mid  soiiK'wliat  Iniijrcr.  I'ndliorax  mid  iiicliillionix  very  coiilcscoiit, 
with  rows  iif  bristles ;  tin'  usual  Iraiisvcrsi!  suture  indicated  uuly 
nil  the  sides.  AlHlnmeii  with  ^^rvvn  sejiiiieiits,  (iiily  live  (»!"  which 
are  visiMe  oii  the  (tiitside  in  the  leiuale,  whereas  in  the  male  the 
sixth  seirnieiit  is  jfciiefidly  pereeptiMe,  ami  the  seventh  consists  of 
the  liy|)opy;riuni,  usually  inflected  under  the  al)domeii  and  com- 
jtosed  of  two  consecutive!  part<,  licarintr  at  the  end  ein'lir  ()aired 
mid  two  sin;i'l('  appemlau'es.  Willis  iiiieroseopically  hairy  (Ui  their 
whole  suilhce;  auxiliary  vein  not  runninu-  towards  the  anterior 
mai'u'iii;  iintericU'  basal  cell  very  short  ;  discoidal  cell  coalesceiit 
with  the  second  l)asal  cell;  ]tosterior  Iinsal  cell  very  small;  alula 
rudiiuL'iitury ;  tofiulu}  distinct,  simple,  ciliated  with  long  huird. 


TAULE  FOR  THE  DETEUMINATIO.V  OF  THE  UENEIIA. 


11 


TABLK  FOR  TIIK  DKTEUMINATION  OF  TIIK  GI^NKRA. 


3 


2 

IB 

3 

14 

4 


10 
11 
12 
13 


{First  niiti'niml  joint  Imiry  ftbovo. 
First  fiiitcimnl  Joint  i,'livliroiis  above. 
{Ilyjiopyijiuni  (listMiL^aijfil. 
Hyiii)l>y,i,'iinn  nioru  or  Icsh  iniliodiltiil. 
{First  joint  of  tho  hind  tur.ii  luistly. 
First  joint  of  tho  hiiul  tarsi  not  liristly.  5 

Faco  duscundini;  an  far  as  tlie  inferior  angle  of  tho  oyo. 

Ot'ii.  I.  IIviiuoTEMXTura. 
Face  not  descending  as  far  as  tho  Inferior  angle  of  tlic  vyv. 

(>eii.  II.  I)oi,i(  iioiTs. 

(  Palpi  of  the  nialo  unusiiaUy  large  (Sen.  XII.  DiosriiAcrs. 

(  I'alpi  of  the  male  sniall  (j 

[The  last  portion  of  the  fourth  longitmlinal  vein  is  parallel,  or  almost 

J  so,  to  the  third  longitutlinal  vein.  (ion.  III.  («YMN(i:''n;iiNrs. 

The  last  jiortion  of  the  fourth  longitudinal  vein  is  distinctly  convergent 

towards  th(i  third  longitudinal  vein.  7 

Tlie  end  of  the  fourth  longitudinal  vein  is  abruptly,  or  at  least  steeply 

detlected  anteriorly.  8 

The  end  of  the  Jourth  longitudinal  vein  is  only  gradually  dellected 

anteriorly.  9 

Arista  with  the  usual  pubescence ;  the  end  of  the  fourth  longitudinal 

vein,  beyond  the  angular  flexure,  runs  in  a  eurve. 

(ion.  IV.  ?Ai!A<i.ira. 
Arista  short-plumose  ;  the  end  of  the  fourth  longitudinal  vein,  beyond 
the  rounded  llexure,  runs  in  a  straight  line. 

(Jen.  V.  Pelasto.vel'kcs. 
/  Tho  face  reaches  down  to  the  inferior  corner  of  the  eye. 
)  (len.  VI.  TAcnYTKK(  nrs. 

'  The  face  does  not  reach  down  to  tho  inferior  corner  of  tho  eye.         10 
(  Proboscis  and  palpi  very  much  prolonged.         Gen.  VII.   OKTHornii.E. 


(  Proboscis  and  palpi  not  prolonged. 
(  Scutellum  hairy. 
I  Siutellura  not  hairy 

{Hypopygium  sessile. 
Hypopycium  pedunculated. 
f  Second  antennal  joint  of  usual  shape. 
(  Second  antennal  joint  rudimentary. 


11 

Gen.  VIII.  SvnisTBOMA. 

12 

Gen.  IX.  IIkucostomus. 

13 

Gen.  X.  Hypojmivi.lus. 

Gen.  XI.  IIaltekkkucs. 


i  ■ 


-.1.,  1- 


!.  J; 


"     '     *        i 


■'.I- 


I .  i'- 


1:2 


DIITKHA  or  NOUTII  AMKlUfA. 


[I'AItT  jr. 


,  ,  (  AbiliiiiU'ii  of  iii.'ilii  l.itci'.illv  coiiiiiii'ssi'.l. 
*  AliiloiiK '1  of  the  iiialo  not  I'diiipri'^scd. 


If) 


(liMl.   XIII.    AXKI'SIUS. 

iproscd.  15 

f  Si'i:(>nil  autcnn.'il  joint  "(  the  usual  transvorso  sliajn'. 
I  (icii.  XIV.   Ak(iyi:a. 


I  t^oi.'onil  antt'iinal  joint  with  a  tliumli-lilit'  iirojcition  over  llic  insiilo  of 

1^  tllO   tllilli.  (ilMI.    XV.     f^YM'OK>U).V, 

I  Tlilivi  anttMina!  join  'n  both  si'xcs  or  at  least  in  tlio  nialo,  iiroloni;(!il, 
I  i)oint<'il,  anil  \  ith  an  apii-al  arista.  17 

lii  I  riiinl  antiMinal  joint  short  even  in  tlio  male,  and  if  it  shoulil  ho 
I  somewhat  prolon^eil,  then  neither  pointeil  nor  with  an  ajtical,  hut 

(^  at  the  utmost  witii  a  suhapieal  arista.  -:! 

/  Second  antennal  joint  with  a  thunih-like  jirojeetion  over  the  inner 

111  side  of  the  third.  (ien.  XVI.   Sy.naktuui's, 

'■  Seeoud  antennal  joint  without  a  tliumh-likt  projeetion,  transverse.  2S 
f  Posterior  tiansverse  vein  distant  from  the  niaitrin  of  tiie  wini;;   iialpi 

1^  I  ineunihent.  11' 


I  Posterior  transvi-rse  vein  appi'oxiniated  to  the  mari;in  of  the  wimr; 
[  palpi  hauijiui;  down.  (ien.  XXII.   Ai'hkosvi.us. 

.,l  (  llypopygium  i>eiluneulatt(';  free. 

'  lIvpopvt,'iuni  sessile,  more  or  less  iinhedded. 


lypopVi. 

.,  ,  (  The  male  ahdomen  has  live  sej-'nieiils, 
l  The  male  alulomeii  has  six  sei^ments. 


palpi  hauijiui;  down. 

(u  n.    XVII.    iSYHTKNCS. 

•20 

(1.  n.  XXI.  is.MiMoTiTS. 

•21 

/  Third  antennal  joint  jirolonu'ed  also  in  the  female. 
'Jl  ■'  (Jeu.  XVIII.  KuAiMiiiMr. 

V  Third  antennal  joint  of  thi'  female  not  prolonged.  22 

fThird  antennal  joint  of  the  male  very  muih  prolon>j<'d   (small,  lesrf 
.,.,  !  liairy  speeies).  (ien.  XIX.    XiiMiAMUturM. 

I  Third  antennal  joint  of  the  male  moderately  proloiiLred  (larger,  more 
l_  hairy  speeies).  (Ien.  X\.    I'iiiiiMlYliol'.-i. 

,.)  (  Fourth  lounitudinal  vein  forkel. 


2-\ 


i  l''ourth  longitudinal  vein  simple 


(ien.  Xldll.   rsii.oiTS. 
24 

r  I'pper  sidi'  of  the  tluuMx  convex  hehind.  2;") 

24-   Upper  side  of  the  thoiax  hehind  with  a  somewhat  concavo  depre.s- 
^  siou.  40 

.,.  (  Fifth  longitudinal  vein  alt<K'eth(:rwantint!;.    (Ien.  XXXVIII,   AcuAi.ef.-^, 
(  Fifth  longitudinal  vein  distinct.  2*! 

r  Distance  of  the  posterior  transverse  vein  from  the  margin  of  the  wing 
eijual  to  its  own  length  or  longer.  27 

Distance  of  the  posterior  transverse  vein  to  the  margin  of  the  wing 


20 


;is 


I  shorter  than  its  own  length. 

Posterior  transverse  vein  unusually  obli<|ue. 

(ien.  XXXIV.  Pi.AcioNKriii'S. 

Posterior  transverse  vein  but  little  obliipie.  2>> 

llypopygiuni  distinctly  heut  imder  the  venter.  2!) 

28  "I  llypopygi urn  uot  distinctly  heut  under  the  veuter  or  entirely  imhed- 

ded.  30 


2!) 


TAIJLE  FOn  TIIK  DFTKIlMtNATFoN  OV  TIIK  (iFAKUA.  13 

'Tlio  faco  of  both  si'xos  very  bnvul,  not  nairowi'il  siiiu-rioily. 

(■I'M.  XXIIl.  TiiiNoiMiu.rs. 
The  f'ai'o  of  hoth  hc-xcs  rather  narrow,  sonunvhat  narroweil  suiieriorly. 

(it'll.  XXIV.   l'i:iii)i;:!i. 


30 


in 


Outer  apiieudages  of  the  liypopy^iiim  loni:,  lilil'or 


(ieii.  XXV.   \i;M.\'roi'KotTfM. 


;i 


Outer  appendaires  of  thi^  hypopVLrimn  not  iong,  nor  lilifornt. 
Tliiril  joint  of  the  male  antenna'  conspicuously  lari^'e. 


(ien.  XXVI.   Li;i'i()STor..\. 


fhiril  joint  of  the  niahf  antenna'  small. 


o.)  (  I'ulvilli  cif  the  male  fore  tarsi  conspicuously  enlarged 


:U 


S3 


34 


O!) 


(  I'ulvilli  of  the  male  fore  tarsi  not,  or  vt'ry  slii^litly,  enlarged. 

f  I'ulvilli  of  th(>  male  fore  tarsi  not  prolonged.     (Ien.  XXVII.    iM'TAi;si's. 


I'ulvilli  of  the  mahj  f 


ore  tarsi  proloiigei 


1.       (it'll.  XXVllI.   DiAnioiu-; 


I 

(  Arista  altogether  or  almost  altogether  apical, 
(  Arista  dorsal. 

(  AViiigs  of  considerahle  size  (larger  sjx'cies).    (Ien.  XXIX 
'  Wings  of  small  si/.e  (smaller  species).  (ieu.  XX 

Foet  of  the  male  with  isolated,  strong,  spine-like  liristles 


:it) 
vKoxKrurs. 


X.  Ciiuvsori'.-*. 


36 


f  I'oel  ot  tlie  male  witli  isolateil,  strong,  spme-liUe  iiristies. 
}}  (iiMi.  XXXI.  Turciioi'iioKCS. 

y  Feet  of  th(^  se\es  without  isolated,  strong,  spiiit'-like  hristles.  37 

„-  (  Face  not  narrowed  ahovt^  (ien.  XXXII.   Svmi'vcxis. 

I  Face  considerahly  narrowed  ahov(>.  (ien.  XXXIII.  ('Avi'sicxKMrs. 

1- All  femora  slendt^r,  ahdominal  segments  with  hristles  liefore  the  hiiKl 
38  -J  margin.  (Jen.  XXXV.   IjIaxcam-s. 

V  Fore  femora  incrassated  towards  the  hasin.  '.]'.) 

..,.  (  Fore  tihia'  with  long  thorns.  Gen.  XXXVI.   ScEi.i.i'.ui. 

(  Fore  tihia!  with  very  shoit  little  thorns.    Gen.  XXXVI 1,   IIvDUoriioiii's. 
.  .  (  Arista  apical,  or  at  least  suhapical,  41 

(  Arista  distinctly  dorsal.  42 

/-Third  and  •ourth  longitudinal  veins  ;,irongly  convergent. 
41  j  (ien.  XXXIX.  MiMtKTKKi-s. 

*.  Third  and  fourth  huigitudinal  veins  ])aiMllcl.    (ien.  XI,.   f^iiuvsoTiMr.'^. 
,„  f  Male  ahdoinen  with  six  distinct  segments.    (Jon.  Xld.   X  ANiiioiiii.diu'.-*, 

(  iMalo  ahdomeu  with  ilvo  distinct  scgmeiita.        (jeu.  XLIl.  Saucuui'L'.s. 


,,    i-i  Mh 


.•  H:< 

^  ^i^^i^ 

M,- 

'  ^bhIf 

*■   --i^l, 

!     I  SfH. 

^  ''•'■' 

'      ''"! .' 

m 

.  ».:_TV- 

;  ■*■.<>>-. 

*4f 

^'' "ti^L 

4' 

'  '^W 

.  !^|  '; 

■!^:i^ 

:.-  -■: 

''■■!■        '(■        '       ^ 


.  I  ?<•• 


11 


u 


DIPTERA  OF  NORTH  AMERICA. 


[part  II. 


ill 


I   :!' 


SYSTEMATIC  ARRAXGEMEXT  OF  THE  GENERA. 

I.  First  joint  of  the  antenna  with  hairs  ou  its  upper  side. 

A.   llypopytriuiii  dist'iigagt'il. 
A.  Palpi  of  tli(3  male  small. 

1.  First  joint  of  tho  hind  tarsi  hristly. 

Ueu.  I.  Ilygi-oceleiitliiiH.  Gun.  II.  llolicliopus* 

2.  First  joint  of  the  hind  tarsi  not  bristly. 

(I.  Third  and  fourth  longitudinal  veins  parallel  or  sub* 
parallel. 

Gen.  III.  Cliyiniiopterniis. 

h.  Third  and  fourth  longitudinal  veins  convergent. 

Gen.    IV.  Parat-lliis.  (Jen.  VIII.  Syliistroiiia. 

Gen.     V.  l*(>lastoiieui'U$.  Gen.     IX.  llei'costuiuiis. 

(!(Mi.   VI.  Tacliyti-ci'liiis.  (Un.       X.  II5 popliylliis. 

(ien.  VII.  Oi'tliocliile.  Gen.     XI.  Ilultei'iceriis. 

1!.  Palpi  of  the  male  conspicuously  large. 
Geii.  XII.  Iliustraciis. 

I?.   Hypopygium  more  or  less  imbedded. 
Gen.  XIII.  AllO|>sills.  Gen.  XV.   Syiltorinoit. 

Gen.  XIV.  Al'gyra. 

II.  First  joint  of  the  antennaj  entirely  bare  on  its  upper  side. 

A.  Third  antennal  joint  in  both  sexes,  or  at  least  in  the  male,  elon- 
gated, tapering  in  a  i)oini,  with  an  apical  arista. 

A.  Posterior  transverse  vein  distant  from  tlie  margin  of  the  wing, 

palj)!  incumbent. 

Gen.     XVI.  !<iyiiarthi'iis.  Gen.  XIX.  Xipliaiidrniiil. 

Gen.    XVll.   Nystcillis.  Gen.    XX.   l*oi-|»liyi'01»S. 

Geu.  XVIII.  Kliaiillilini.  Gen.  XXI.  Kiuiliotlis. 

B.  Posti'rior  transverse  vein  approximated  to  the  margin  of  the 

wing;  pal}ii  hanging  down. 

Gen.  XXII.  Aplli'osylus. 


■:V*.T'-V 


SYSTEMATIC  ARRANGEMENT  OF  THE  GENERA. 


15 


B.  Third  antennal  joint  short  even  in  the  male,  or  if  somewhat  elon- 
gated, then  neither  pointed  at  tip  nor  with  an  apical,  but,  at 
the  utmost,  with  a  subapical  arista. 
A.  Fourth  longitudinal  vein  simple. 

1.  Upper  side  of  the  thorax  convex  posteriorly. 
«.  Fifth  longitud'nal  vein  distinct. 

a.  Distance  of  the  posterior  tranaverso  vein  from  the 
liind  margin  of  the  wing  e^ual  to  its  own  length 
or  longer. 

XXIII.  Tliiiiopliilus.  Gen.  XXIX.  T.yroiiriiruH. 
,     XXIV.  PeodCH.  Gen.      XXX.  C  liiysotiis. 

XXV.  A'eiuatoproctiis.Gen.    XXXI.  Teiielio|»hoi-iis. 

XXVI.  I^eucostola.  Gen.  XXXII.  t^yiiipyciiUK. 

,   XXVII.  Eiltai'siis.  Gen.  XXXIII.  t'aiiipsiciieiiius. 


G<m 
Gen 
Gen 
Gen 
Gen 
Gen.  XXVIII.  Diapliortis. 


Gen.  XXXIV.  I'lugioiieurtis. 


S.  Distance  of  the  posterior  transverse  vein  from  the 
margin  of  wing  shorter  than  its  own  length. 

Gen.   XXXV.  Liaiicalus.  Gen.  XXXVII.  Ilydiophoriis. 

Gen.  XXXVI.  Ncellus. 

/).  Fifth  longitudinal  vein  altogether  wanting. 
Gen.  XXXVIII.  Aclialcus. 

2.  Upper  side  of  the  thorax  posteriorly  with  a  Hat,  somewhat 
concave,  declivity. 

Gen.  XXXIX.  9Iedeteius.  Gen.   XLI.  Xaiitliocliloi'Us. 

Gen.  XL.  Clll'ysotillllis.        Gen.  XLII.  Sauci'opus. 

B.  Fourth  longitudinal  vein  forked. 
Gen.  XLIII.  Psilopus. 


'  '  ,-  ■'■'1 


i  .   If 


1- 


:*!'! 


m 


.'■.'■Mi  '"Wft'il 


UYGnOCELEUTIIUS. 


17 


Gen.  I.     IIY(;R0C  ELELTIXITS. 

Tho  jrcnora  Ifi/f/rucelrii/lndi  and  Jtolifhojxi.'^  nro  tlir  only  ones 
which  liavo  sitinc-likf  bristles  on  the  lii'st  joint  of  tlio  hind  tarsi, 
and  this  ciiaracter  helps  to  distinn'uish  them  most  easily  I'voin  all 
other  Dijlir/nijxxliih'e.  They  have  also  the  tblhtwinj^  charnrters  in 
conmion  :  first  antennsd  Joint  beset  with  hairs  aliove  ;  third  Joint 
not  prolonu'cd  ;  arista  dorsal  ;  hyiiopyii'iiim  eidirely  diseiiii'au'ed; 
its  outer  appendau'es  jtroporlionally  larii'o  or  m(»dei'ately  lartro, 
lamellilorm.  The  diiVereneo  between  the  two  fj;enera  is  to  1)0 
Tound  in  the  lenji'th  of  the  face,  which,  in  JL/gmceleuthus,  reacrhes 
do",  n  to  the  inferior  corner  of  the  eye,  and  which  is  shorter  in 
l)ulir/iopu.<.  In  the  tyjiical  species  of  IIij(/rocclt'itl/ii(ti  the  first, 
and  sometimes  also  the  !'ec<)nd  joints  of  the  antennie  are  consider- 
ai)ly  lonsi'er  than  in  Dulic/iojiui^.  As  on  one  side  the  Kuntpeaii 
ILjijnjc.  Diadetna  Hal.  a[)proacl»es  Dolic/ioinin  by  the  structure 
of  its  antenuie,  so,  on  the  other  side,  some  species  of  Jkilicliojuii^, 
for  instance,  I),  jilinnipcs  Seop.,  a  sjx'cies  common  to  Europe  and 
North  America,  are  related  to  ILjgrureleulhuH  by  the  somewluit 
jrreater  len.^'th  of  their  face. 

1  know  as  yet  only  four  species  .)f  iri/i/roccleiilJius ;  of  the  three 
typical  species,  one  iidiabits  northern  and  middle  Kurope;  the 
second  Sil)eria;  the  third  North  America.  The  fourth  si)ecies  of 
the  ifcuus  is  spread  over  all  Kurope. 

The  name  JIi/yrorcleut/iuH  (iycoxiuv^o^,  livin<>'  in  the  wet)  has 
been  fjiven  to  the  genus  on  account  of  the  species  being  found  ia 
moist  localities. 


.■.■■:>. 


1.  II.  latipes  LoEW.  %  and  9. — Aeneo-viriflis,  aiiteiinis  lufis,  ciliis 
oeiilonnu  inferioribus  palliilis,  tegularum  ciliis  nigris,  tarsis  iiiteriueiliis 
maris  compressis. 

Brassy  green  ;  antenna;  red  ;  cilia  of  the  inferior  orbit  pale ;  cilia  of  tlie 
tegulie  black ;  middle  tarsi  of  the  male  compressed.  Long.  corp.  0.2(3. 
Long.  al.  0.23. 

Syn.  IIij(jrocdcuthus  latipes  LoEW,  Neue  Beitr.  VIII,  5. 
2 


18 


DIPTKRA  OF  NOHTII  AMERICA. 


[part  II. 


.■^'i 


w 


Clrccn,  sliiiiinji:.  Aiiti'iiiiic  rcMldisli-yclIow,  with  a  black  suj)c- 
rior  odf^e  and  witli  the  tip  of'tlie  third  juiiit  hliiclc;  first  j(jint  nar- 
row and  elonji'atod.  Face  white,  y<'Ii()wish  al)()V<',  much  hroador 
in  tlic  9  tiian  in  the  J*.  Cilia  (if  llie  inferior  orhit  pale.  Fore 
coxa",  tip  ofthe  middle  and  hind  cox  se  and  feet  yellow;  tarsi  black 
from  the  tip  ofthe  first  joint ;  the  lirst  joint  of  tlie  fore  tarsi  some- 
times altotrether  diiskv :  the  root  of  the  second  joint  of  the  hind 
tarsi,  on  the  contrary,  is  pale.  On  the  up]ier  side  of  tlie  nuddlo 
til)i!e  a  bristle  is  conspicuons  by  its  frrcater  lentrth;  tliere  are  two 
bristles  i)efore  the  tip  ofthe  hind  tibiiu.  Tejruhu  with  black  cilia. 
Wings  tinned  with  l)rownish;  fourth  longitudinal  vein  not  broken; 
hind  transverse  vein  straight  and  steep.  Four  last  joints  of  the 
middle  tarsi  comitressed  in  the  J*,  beset  on  the  upper  side  with 
incumbent  l)lack  hairs;  the  fifth  joint  much  narrower  than  the  pre- 
ceding ones.  Costa  with  a  .stout  swelling  near  the  tip  ofthe  first 
longitudinal  vein.  Ijamelhe  of  the  hyi)oj»ygium  of  moderate  size, 
white,  bordered  with  black  at  the  tip,  jagged  and  fringed  with 
black  bristles. 

JIab.  Xorth  Red  Hiver.     (Kennicott.) 


Gen.  11.     DOLICIIOPL'S. 

The  ])rincipnl  characters  of  the  genus  DolicJiopus,  as  it  foll(^,ws 
already  from  what  has  been  said  al)oiit  it  in  the  genus  I/i/yro- 
celiiutltuH.  are:  the  ])resence  of  hairs  on  the  np)>er  side  ofthe  first 
antennal  joint,  the  shai)e  of  the  third  joint,  which  is  hardly  ever 
very  much  elongated,  the  dorsal  position  of  the  arista,  the  en- 
tirely disengaged  hypo])ygium,  the  lamelliform  shape  of  its  rather 
large  outer  appendages  and  the  presence  of  spine-like  bristles  on 
the  first  joint  ofthe  hind  tarsi. 

The  genus  Dolifhopux,  established  by  liatreille  already  in  ITOl), 
is  the  oldest  of  the  family.  It  comprised  at  that  time  all  the 
J)oIich()pi)'li(hi',  so  that  all  the  other  genera  have  been  gradually 
formed  l)y  the  se])aratiou  of  some  groups  ami  by  further  subdivision 
of  the  latter.  T,i  the  sense  in  which  this  genus  was  ado])ted  liy 
Wiedemann  ami  Meigen,  it  still  included  the  present  genera  (!i/m- 
nojito-nxK,  Pavaclin:^,  rdnntoneurus  and  Tachnlrcchua,  besides 
some  isolated  species  belonging  to  other  genera,  which  had  l)een 
erroneously  located  in  it.  (Such  was  the  case,  for  instance,  with 
D.  adudua  Wied.,  which  belongs  to  Lyroneurus.)     The  dcliiii- 


1  -  ' 


roLiciioi'us. 


19 


tioii  of  DoVichopm^,  iti  its  iircsciit  limited  i-^ctisc,  ^vils  jrivcii  liy  nit.' 
in  iSf)".  Still,  t'vi'it  now,  tliis  is  one  di'  tlic  iiii'.n-cst  uciicra  dl'iliis 
family.  Altli()U,u'li  ixtsscssiiiu'  iihiiiKliiiit  jiiid  striklnj:'  spcciric  dif- 
fcrt'iin-s,  its  iiiimcniiis  sjiccics  show  iit  the  siimc  time  so  much 
nuM'ct'mciit  ill  tlicir  •i'l'iici'id  oi'u'iiiii/atinn,  tlint  n  suiidiv  isioii  into 
f^imdlcr  u-ciicrii  is  imitossihlc  iil  iircsmt,  and  in  fntnri'  an  attcmjit 
of  that  kind  will  I'ccinirc^  a  jrrcat  deal  of  i-antion.  One  is  easily 
tempted  here  1o  establish  jrenerie  jiTonps  founded  upon  charaelers 
<ir  a  purely  speeifn'  Aalne.  The  ^i'enns  IthdtjDiicin'a.  fornu'd  liv 
Jxondani.  is  diu'  to  a  mistake  of  this  kind.  'J'o  found  a  new  u-eiuis 
on  I),  zirzdr,  wliieli  species  a]>parently  rcfpiires  it  on  aee()unt  of 
!>ome  dilVerenees  in  the  nenration  and  in  the  structure  of  the  an- 
tenna%  seems  hardly  worth  wiiile,  as  this  is  as  yet  the  only  species 
showiau'  such  dill'erences. 

The  .u'eotiTaphical  distribution  of  tlie  jrenns  Jhlirhopx.^  cannot 
1)0  inferred  from  the  data  found  in  older  authors,  as  this  <j,-eiuis  con- 
tained at  that  time  very  lieteroL''eneous  elenn-nts.  Ni'ithcr  can  Mr. 
AValker's  sujierlicial  publications  on  exotic  species  be  considered 
in  tills  respect  as  a  source  of  information,  as  it  is  impossilile  to 
tell  from  his  descriptions  which  of  his  species  beloiiLr  to  /hilicJiii/nm 
in  the  restricted  sense.  Those  species  from  the  soiitliern  liemis- 
jihere,  and  from  the  southern  parts  of  the  northern,  which  I  hail 
occasion  to  oxamino  at  ditferent  times,  ]»roved  not  to  belonu'"  to 
JfoIicJiopus  in  that  sense.  FFence  we  may  safely  ciiucjude  that 
the  li'cnns  DoIicJmpK.^.  in  the  lar^'e  majority  of  its  species,  belongs 
to  the  cold  and  temperate  zones  of  the  northern  hemisphere;  it 
can,  at  least,  be  positively  asserted  that  the  nunii)er  of  sjiecies,  in 
l']urope  as  well  as  in  America,  goes  on  dimiiiisliinii-  toward  the 
South. 

The  name  of  the  geinis  (5oxi;^dj,  lonpr,  and  /tovj,  fool)  lias  refe- 
rence to  the  lenu'th  of  the  feet  of  its  siiecies. 

Thirty-one  North  American  sjx'cies  u['  ])njiihn}i}i.<  liave  been 
described  by  former  authors;  some  of  them,  however,  do  not  belonir 
to  this  <i-enns  in  the  restricted  sense  adopted  here.  Of  these 
species  three  have  been  described  by  Say,  one  l)y  Zetterstedt,  one 
by  .Mac(iuart,  and  twi'iity-six  by  Walker.  1'Iie  descriptions  given 
by  ]\rr.  Walker  are,  for  the  most  part,  very  bad,  and  \\\v  wor-t 
are  those  i)ublished  in  the  l)i[itrra  Saunder/^idD'i,  as  they  con- 
tain only  such  characters  as  are  common  to  all  the  species,  or  at 
least  to  entire  groups,  without  paying  the  least  attention  to  tlioso 


'"  ii 


v'Ka 


W' 

iC ' 

Wi^ 

'■'■«■: 

*■  .i 

(■1 

.  ^  \'y..A 

:"-Jk1 

■'•I'i-lll; 


■ 

,', '  ■'  ■  '■     ' 

1   ,.' 

1  ...'■;, 


20 


DIPTERA  OF  NORTir  AMERICA. 


[I'ART  II. 


I  IP"' 


I 


■m 

■111! 
M 


'I'm 


marks  wliicli  serve  to  distiiifyuish  cue  speeies  from  another.  Tlio 
cij^hteeii  descriptions  contained  in  tlie  />/.s/  of  Di'iilcni  of  t/u; 
Jh'iliHh  Mufit'uni  mention  at  least  occasionally  sncli  spi'cilic  cha- 
racters, and  nniy  tiu'relore  contain  some  (hita  for  identifMation ; 
but  their  great  defect  is  tliat  Mr.  Wailcer  has  not  given  u  coniph'to 
descrii)tion  of  those  peculiar  marks  whicli  distinguish  the  males  of 
many  species,  so  that,  from  his  silence  alumt  these  marks,  one  can- 
not with  safety  conclude  that  they  are  really  wanting.  This  accu- 
racy is  ahsolntely  necessary  in  order  to  nud\e  a  description  avail- 
able. Among  tli(!  forty-one  North  American  hDlichupodidn  now 
known  to  me,  I  recognize  with  certainty  only  a  i<iutil('  ft/ifcics 
already  desc'ibed  before  (besides  the  three  species  which  Morth 
America  has  in  common  with  Knrojie,  J),  jilinin'in's  Scop.,  J>. 
brcrijicnuiii  Meig.,  and  />.  (/<Vc//tv  Staiin.);  it  is  the  />.  vtijin'niDi 
W'h'd.  (=  capn'tis  Say).  This  striking  result  induces  me  to 
give  a  separate  account  of  all  the  other  sj>ecies  [»ublished  by  former 
authors,  in  the  order  of  their  publication. 

1.  obscuriis  .S«_//.     This  species,  also  described   by  Wiedemann,  evi- 

dently belongs  to  tlio  genus  (ii/iniiojiteniiis  and  will  be  diseu.ssed 
there.  Wiedeuiann'r:  colh-ction  alFords  no  liglit  upon  this  species. 
It  contains,  it  is  true,  two  specimens  of  a  /Julif/injiiis  marked  olisriirH.<, 
but  this  is  no  other  than  a  species  of  Tuchijtrtchiis,  from  the  Cape, 
described  by  Wiedemann  himself  under  the  name  of  vlixcwmiti.  It 
is  prol)ablo  that  Wiedemann  named  this  species,  as  he  was  in  tho 
habit  of  doing,  as  soon  as  ho  received  it  in  his  collection,  and  that 
when  he  described  it  afterwards,  he  dianged  its  name  to  oliscinnis, 
on  account  of  the  already  existing  vhscunis  Say,  neglecting,  at  the 
same  time,  to  change  the  etiipiette  in  his  collection. 

2.  abdominalis   Sa;/.     The   abdomen  is   said   to  be   reddish.      If  Say 

means  a  reddisli,  non-metallic  color,  iheu  it  is  a  distinct  species, 
entirely  unknown  to  me,  which  will  lie  easily  recognizable  even  if  it 
is  no  true  Dulic/iu/iiis,  as  may  very  probably  l)e  tlie  case.  If,  how- 
ever, he  means  a  metallic,  copi)ery-red  coloring,  then  the  descrip- 
tion is  too  unmeaning  to  jjronounce  even  about  its  belonging  to 
DoHchojt\is  in  the  restricted  sense ;  as  to  the  identification  of  tho 
species,  it  is  altogether  out  of  question. 

3.  groenlandicus  Zett.     A  true  DdlicliD/iKs  with  black  as  the  prevailing 

color  of  its  feet.  It  is  not  among  tlie  number  of  the  species  known 
'o  me. 

4.  heteroneurus  Murq.  is  either  a  Piltistonennm  or  a  Paraclins. 

5.  bifrons  Wal/c.     Di)>t.  Saund.     It  may  be  inferred,  from  the  peculiar 

coloring   of  the   face  of  this   species,  that  it   is   a  I'elastonenrus, 


^ym 


roi.iciioi'rs. 


21 


Rltlioutrli  no  mention  is  made  of  tlm  ptH'uli.ar  rourso  ot  tho  fourth 
loii.'.'itiicliiial  vein,  wliicli  cliaradttMi/t's  tliis  pcnus. 
6-0.    consore,    contingens,  hebes,   ineptus,    all    lour  (Inscribed   hy 
Wiilkir  in    till'  liijit.  ^^aullll.  tVoiii  t'l'inale  spccjiHcns.     Tlie  tlt'serip- 
tions  aie  so  nrctcliril  tliat  tlie  iilciitili  ation  is  iiii))ossilili'. 

10.  maculipes   W'nlk.     I)ii>t.  Saund.     Tlie  si)ots  on  tlie  tiliia',  niciitioned 

liy  W'alknr,  seem  to  iiulicate  tliaf  this  is  a  I'l  /h.i/dih  iivii!i.  But  tlio 
Iteeiiiiar  course  of  the  fourth  loiiL'ituilinal  vein,  the  chief  character 
of  the  1,'onus,  is  again  not  mentioned. 

11.  piilchcr   \\'ii//r.     Dijit.    Saund.     I  take  this  to  lie  a  true  Jiolicliupiin^ 

allli'iiiiih  the  datum  of  the  fouith  longitudinal  vein  lieyond  its 
flexure  not  converging,  hut  lieiiii,'  ]iarallel  to  tlie  third,  seems  tw  in- 
dicate a  (I'l/iitiiiijiii  runs.  It  lit'lonu's  to  tlic  species  with  hlack  femora, 
but  nniontj  the  species  of  this  description  wliit  h  I  possess  from 
>.'orth  America,  there  is  none  to  whi(di  .Mr.  Walker's  description  of 
thH  fourth  longituilinal  vein  is  apiili(al>li'. 

12.  variiis  II'k//,-.     Dipt.  Saund.     A  very  distinct  species  on  account  of 

its  sjiotted  wings  and  which  will  he  easily  recognizahle  even  if,  as 
it  seems  jirohalile,  it  does  not  hidong  to  the  genus  I hilirhdjins. 

13.  aflinis   W(tlk.      This  and  the  following  sjieci'  •  have  heen  (leserihed  hy 

Mr.  Walker  in  the  IJ<t  of  Jh'/ilcni,  itc.  All  helong  very  jirohahly 
to  the  genus  .OiJii/injiic:,  :\\mI  to  tlie  STihdirision  with  yellow  feet, 
except  the  cases  which  I  have  expressly  meiitioueil  helow.  It  is 
not  said  whetlier  tlie  teguL'c  of  IK  (ijliiu's  arc?  ciliated  with  hlack  or 
pale  hairs.  If  the  latter  is  the  case,  and  if,  as  it  ajipe.'irs  from  Mr. 
Walker's  data,  the  hind  tarsi  are  altogether  hlack,  my  />.  s/ih  ndidi/.i 
might  alone  be  taken  in  consideration  ;  but  it  is  hardly  iiossilile  that 
it  should  be  this  species,  as  Mr.  Walker's  description  of  the  color- 
ing does  not  apply  to  it,  and  as  tin;  hind  femora  of  the  'J,  of  J). 
ojfinin  Walk,  are  ciliated  with  only  a  few  hairs,  whereas  in  I). 
splcnilidiis  these  liairs  are  very  numerous.  If  />.  aflinis  has  black 
cilia  on  the  teguhe,  then  /.*.  ilisrifr  and  Inlmtiis  could  he  thought 
of,  but  tlie  hind  femora  of  their  males  are  entirely  destitute  of 
bristles,  so  that  the  description  of  Jk  affinis  cannot  be  applied  to 
either  of  them. 

14.  lamellipes  W(tlk.      It   has   the   inferior  orbit  ciliated   with    black. 

Among  the  North  American  species  of  Jhiliiluijins  with  pahscolorcid 
feet  D.  jiiirliyciK mils  and  D.  Iircripi  nnis  alone  partake  of  this  cha- 
racter. The  other  data  of  Mr.  Walker  (h)  not  aj>ply  at  all  to  these 
species,  as  neither  of  them  has  a  white  face,  the  first  antennal  joint 
red  and  the  third  joint  very  long. 

15.  ciliatus  Wall..     Very  poorly  characterized.     I  suppose  that  the  cilia 

of  the  inferior  orbit  are  pale.  If  the  tegulie  are  likewise  ciliated 
with  pale  hairs,  then  IJ.  niiidliiUs  and  />.  liit< ijicnuis  might  be  taken 
in  consideration.  Ibit  I},  raridhi/is  has  no  golden-yellow  face,  its 
fore  tarsi  are  not  "dark  tawny,"  but  always  black  from  the  tip  of 


Hi 

t  ■     !■  ■ 


oo 


ni'TEUA  OP  NORTH  AMEIlirA. 


[I'AHT  11. 


I 


tho  first  joint;  Iwsitlos,  its  iiinlo  lia.s  ciliati'd  liin.l  foiiora,  which 
Mr.  ^\^'Uk»■r  ilops  not  as(3rilu)  to  his  sjit'cics.  />.  In/i  i/iciinls  hait  a 
wliito  fat  o  ;ui(l  tho  hist  joint  of  its  I'orc  tarsi  Ma(.'l\  ;  its  wiiiu's  aro 
yt'Uowisli  iuiil  not  i,'ray,  tho  veins  art-  luti'oiis  ami  not  Macl<  ;  liiiaily 
tho  liiml  IV'niora  of  its  maio  aro  also  ciliatfil.  If  tlic  ti'triila'  of  />. 
viliiiht!<  an.'  L'iliati'il  witli  hl.ack,  tln'ii  ««?  niiulit  jicrhajiS  iilnitilV  it 
■witli  /).  rilldliis;  hut  tin'  .-iizt'  of  tlio  hitter  is  too  laii^c  to  ailiiiit 
«if  tiiis  i(h'ntilicntion,  anil  its  faic,  insti^'iil  of  hciim  ^rolih-n-vi'llow,  is 
whitisli;  its  fori"  tarsi  aro  not  dark  tawny  hut  always  hlaik  fioiu 
the  tip  of  till'  third  joint. 

Ifi.  adjacens  Wall:.  Very  poorly  descrihed  from  a  fcniah'  spiciincn,  so 
tliat  it  would  ho  cntiri'ly  useless  to  nttoni]>t  its  iilt'iitilluation. 

17.  coercens  Walh.  Mr.  Walker  ^vs  that  the  coxa' are  hlackisli-LTfcn 
towards  tho  hasis.  'J'his  uhaiaeter,  conihined  with  tin-  others  which 
aio  ^ivun,  excludtis  at  once  all  the  species  with  the  teLriilie  frin!.'e(l 
with  hlack,  which  are  known  to  \m  ,  If  the  te.L'uhe  are  fiint:ed  with 
yellow,  this  species  niicht  he  taken  for  JK  liiiH/iinnitiis ;  hut  tho  last 
joint  of  tho  foro  tarsi  of  the  latter  is  only  moderately  enlarged, 
assuming  tho  shape  of  a  very  small  lamella,  and  its  hi  ml  tarsi  aro 
colored  hhiek  in  a  rather  striking  manner  from  tho  very  root  of  tho 
first  joint;  whereas  Mr.  Walker  says  that  in  liis  species  they  aro 
pitch  hrown  towards  the  end.  Under  such  cirenmstanees  the  des- 
cription of  IJ.  Ci.ircdis  Walk,  cannot  possihly  he  referred  to  D. 
loiuiiiiKinna. 

IS.  finitus  W'lilh.  If  the  tegnhe  ai'o  fringed  with  pale,  then,  among  the 
species  known  to  me,  D,  loiii/iimuius,  D.  sjilciuliilii.i  and  L>.  Iiniilli/'cr 
■  have  to  ho  taken  in  consideration.  The  face  of  D.  loiniininiius  is 
not  whitish,  hut  pale  ochie-yellowish  in  the  %  and  yellowish  gray 
in  the  9  the  cilia  of  the  inferior  orhit  aie  not  white,  hut  yellowish, 
and  the  hind  tai'si  are  not  }iale  at  the  hasis,  as  in  D.jiiiitnn,  hut  en- 
tirely hlack.  D.  .iiilciulidiis  is  distinguished  from  IK  jiiiitus  hy  its 
hind  tarsi,  which  are  not  pale  at  tlie  hase,  and  hy  the  ciliated  hind 
femora  of  tho  male.  The  face  t)f  D.  hittillifcr  is  not  white  ;  the  hind 
femora  of  tho  male  are  ciliated  and  tlie  hind  tihi.'c  incrassated  in  a 
very  striking  manner;  therefore  this  sj)ecies  is  also  distinct  from 
D.  finitus.  If  the  cilia  of  the  teguhu  of  D.  jinitus  are  hlack,  then  we 
might  compare  />.  thsrifrr  and  lolidtiits  witli  it.  The  hind  taisi  of 
D.  (liacifir  are  not  pale  at  the  hase,  and  the  first  joint  of  the  an- 
tenna) is  tinged  with  hlack  only  on  its  upper  edge,  so  that  it  is 
hardly  prohahle  that  Mr.  Walker  should  have  overlooked  its 
striking  red  coloring.  This  also  excludes  this  species  from  tho 
identification  with  1).  Jlnitut^.  The  hind  tarsi  of  IJ.  IoIkiIhs  likewise 
aro  not  pale  at  the  hase,  and  the  first  joint  of  the  anteinne  is  red, 
and  only  somewhat  dusky  on  its  iipi)er  edge,  so  that  it  has  also  to 
te  considered  as  difl'erent  from  D.jiuilus, 


:'l'i'!i\ 


roLinioprs. 


'>3 


19. 


20. 


21. 


22. 

23. 

24. 


distractiiB  Wnik:  Walker  s;iy-i  notliiiij;  almnt  tlio  «ox  of  tin)  ilo- 
HcribtMl  Hi>t'cliiii'n ;  it  si'ciiis  to  liavti  hccii  a  t'cinalc  Tim  (lc>iiij). 
tion  ilduH  nut  nlloi'il  any  data  lt>r  own  an  aiiin'oxiiuiitivu  iilriitilica- 
tion. 

discessua  11 '(///.-.  Mr.  Walker  gives  a  very  unsatisfactory  il«'serii>- 
tion  uf  a  female.  It  is  u  rather  surpri^in^  datinu  that  the  ii|>iier 
si<li!  i)f  the  tliciax  has  two  longitnilinal  coiiiiery-reil  stripes,  whereas 
all  the  species  known  to  iin',  ami  marked  with  .--tiiiies  of  this  eolor, 
liave  always  three,  that  is,  a  naiiow  intermeiliate  one,  and  two 
ljroa<l  lateral  ones.  This  character  might  peiliaps  seive  as  a  clu(! 
for  identilication. 

coutiguus  W'dl/c,  Nolliing  is  said  ;il)(int  the  color  of  the  cilia  of  the 
inl'eiior  orbit.  If  tliey  are  lil;uk,  then  it  is  certain  that  I).  <iiiiliiiiiun 
is  not  among  the  sjiecies  from  North  Ameiica  known  to  me.  If 
they  are  pale,  it  still  remains  to  lie  known  of  what  color  are  tho 
cilia  of  the  tegula-  ahout  which  Mr.  Walker  is  also  silent.  Sup- 
posing that  they  are  jialtf,  then  J).  Kjiliinlidn.'i  woiil<l  hav(>  to  hn 
taken  in  consideration ;  hut  its  male  has  fringed  Iiinil  femura  and 
cannot  tliereforo  he  identilied  with  /K  ciiiiti'iiius.  U  the  cilia  of  the 
tegul;e  are  black  then  we  would  have  to  comjiare  JK  (lisii/'> r  iiiul 
lubiitiis.  Hut  the  last  joint  of  the  fore  tarsi  of  IK  ili.~rij'<  r  is  not  at 
all  nmcli  enlarged,  and  forms  only  a  small  pallet ;  tlierefore  it  can- 
not be  taken  for  D.  coiiti(/i!iis.  I),  lolititus  has  a  very  much  enlarged 
last  joint  of  the  niale  fore  tarsi,  but  as  the  first  joint  of  the  antennx' 
is  red  and  only  slightly  dusky  on  the  upjier  edge,  and  as  the 
lamellre  of  the  hypopygium  have  a  broad  black  margin,  whereas 
AValker  describes  the  lamelhe  of  />.  rinit'Kjitun  simply  as  whiti.-h,  as 
the  wings  of  1).  /ulmhis,  in  the  male  sex,  are  distingui.-heil  by  their 
peculiar  sliape,  which  is  not  mentioned  in  the  descrijition  of  /'.  foii- 
ti(jiiiis,  on  account  of  all  this  we  cannot  consider  these  species  as 
being  identical. 

exclusus  11 '((//.-.  Very  poorly  described  from  a  female,  so  that  all 
ell'ort  to  identify  the  sjiecies  must  remain  fruitless. 

COnfinis   Wail:.     The  s^ame  may  be  said  of  this  sjiecieiJ. 

COUtermiiius  11''//.'.  Mr.  Walker  does  not  mention  the  color  of  the 
cilia  on  the  tegnliv,  and  this  renders  the  identilication  impossible. 
If  they  are  black,  then  the  species  is  not  among  those  known  to  me. 
/>.  iHscijir  and  /'.  IhIkiIus  are  here  again  the  species  with  which  Mr. 
Walker's  descrijttion  agrees  in  most  jiarticulars,  but  both  aie  ea.-ily 
distinguished  by  the  absence  of  fring(f  on  tlu'  bind  femora  of  the 
male.  If,  on  the  contrary,  the  cilia  of  tb(i  tegiita*  of  I>.  cdiit.  rmiims 
are  pale,  then  1).  sph  lu/idus  might  iinssibJy  be  identified  witli  it, 
although  it  must  be  admitted  that  the  eoloriiiLr  of  this  sjieeies  as 
well  as  some  other  characters,  somewhat  disagree  with  Mr.  Walker's 
description. 


,1'^ 


u 


\:'h  I 


!    I 


^'>v'.<-  .' 


li;  i 


24 


DIPTKIIA  OF  N»»UTII  A^FKHICA. 


[I'MIT  ir. 


ilMl 


nir 


2f).  separatuB  H'x'/.  Hail  (If.sriiiitiuii  of  a  ffinalo,  romlurin^  iilciitilluu- 
tidii  iiii|>iissil>li>, 

Uii.  terminatus  W'nlL-.  Also  n  ffinalo  ilfsciilicd.  The  only  HjoTicH  to 
whicli  it  may  jiosHJlily  lio  ri'lVircil  is  />.  rliri/snsliiiiiiis,  ami  I  would 
liavu  no  itotilit  alxiiit  it  it'  I  knew  that  the  rilia  of  tho  tt'^iilii^  of  /), 
t' niiiiiiihis  art'  black.  Hut  Mr.  Walkci'.s  (icsciiiitiou  is  silftit  ahout 
this;  lU'itluT  <lo<'H  it  lut'Utiou  tho  very  HtrikiuLj  lilack  incisures 
which  till)  aliilonu'U  of  /'.  ihri/siislniiiiis  shows;  Ihwilly,  tho  tliiiil 
joint  of  till'  aiitcunic  of  tlio  latter  sjiccics  is  {lointcil  at  tlio  tip.  Con- 
hiiltMini,'  all  this,  it  woiihl  ho  |ii'cniatiii'o  to  assunio  the  iilenlity  of 
those  species.  Thoso  who,  in  the  dotonnination  of  tlio  species,  rely 
upon  possiltilities  ami  vague  reas(iniiiL;s,  would  iierhaps  do  so.  And 
douhtless  it  is  th;it  the  adi'jition  of  this  synonymy  would  be  nioro 
reliable  than  tliat  of  any  other  of  \\'alkei''s  .spucierf  with  one  of  thoso 
described  by  nio. 

27.  sequax  Walk:     Mr.  Walkor  says  tli.'tt  this  sjiecies  has  small  tufts  of 

lilack  haiis  at  the  basis  of  tlio  middle  tibi;e.  He  does  not  mention, 
however,  whether  this  pecnliarity  is  to  bo  found  in  tlio  male  alone, 
or  in  both  si^xes.  At  all  events  this  is  a  vtjry  unusual  distinctiou 
amont;  tho  sjiecies  of  Ihilirhtijiiilw,  which  will  render  tho  ideiitillca- 
tion  easy.     This  species  is  not  among  thoso  described  by  me. 

28.  Boccatus  11'"//-.     Tho  sex  of  tho  described  specimen  is  not  men- 

tioneil ;  it  seems  to  have  been  a  fi'Uialo.  Tho  description  is  too  in» 
complete  to  allow  rccoi,'iiitii)n. 

29.  remotuB  J!'"//:.     Descrijition  of  a  male  with  plain  tarsi.     The  cha- 

racters given  allow  a  comparison  merely  with  l>,  iin-isurnlis,  tho 
male  of  which,  however,  has  fringed  hind  femora  and  cannot  there- 
fore bo  identical  with  I>.  niimiiix. 

30.  D.  irrasxis  Walk.     This  is  a  small  sjiecies,  distinguished  by  its  dark 

blue  color  and  unusually  short  abdomen,  which  is  certainly  not  to 
be  found  among  tho  spei'ies  known  to  mo.  It  suoms  probable  that 
it  is  no  true  Duhchopus  at  all. 

The  slender  result  of  the  foregoinpf  (liscnssion  of  Mr.  "Walker's 
species  is,  tliiit  there  are  only  Uro  aiuoiig-  them  which,  witli  cer- 
tain prohleiiuitical  aduiissiuns,  may  perhaps  be  identified  with 
species  described  liy  me,  namely,  I),  conlvrminua  Walk,  with  my 
1).  splendidus,  and  D.  (crminalus  with  1).  cJn-ijsodomKS. 


To  facilitate  tho  determination  of  the  species  I  privo,  first,  a 
dichotomic  tal)le.  I  (uiinil  it  impossible  to  briiifj  it  down  to  tho 
single  species  without  making  use  of  characters  peculiar  to  tho 


iSi: 


lifi,- 


."Ill 


i>(>i,irrt(»iMM. 


SK 


iiiaU'  sex  (.Illy.  Tlic  systciimtic  iuTiiii;rt'Mifiit  wliidi  rulluu>  llic 
ilirliutiiiiiir  taltl*'  suliilisMlt's  tin*  ^^'iiiis  in  ^Tulips,  rmiiHlol  ii|iiiii 
easily  pcrcjiililili'  (•lini'iictcrs  imihiiiiihi  to  luiili  x'Xts.  I  tliiiik  it 
will  lie  iiscriil  10  retain  tli(".t!  n'ruiips,  (ir,  at  least,  llie  ]iriiiei|ial 
aiuoii^  tlieiii. 

Tnhlf  for  ihlfimhiiiiij  the  Sjii  tif!<, 
(  I'ri'vailinu'  color  of  tin-  f'-ft  Mai'k.  2 


=  { 


(  I'rcvailim:  culor  of  tlin  ftti-t  yellowish, 

(ilia  of  tlid  inferior  orl)it  black. 

Cilia  of  the  inferior  orbit  whitish. 

Face  ochre  yellowi>h. 

l''act'  silvery  white. 

I'irst  joint  of  hind  tar>i  with  nntnerons  bristles, 
,  First  ioint  of  hiiul  tarsi  with  but  ftjw  bristlus. 


1  {j'r^t^^ts  /. 

2  laticornis  A 

:i  setifer  A 


j^  (  LanielliB  of  the  hypopygiuni  jwiuted. 

(  Lanielhe  of  tho  hypopyifiuni  roundud  ovate. 
(.  (  Cilia  of  the  inferior  orl)it  black. 

I  Cilia  of  the  inferior  orbit  palo, 
I'ore  coxiu  blackish. 


ow. 


f  (  nin<l  tibia'  lilu'k  only  at  tho  tij).  0 

(  Hind  tibiic  (luite  black.  7 

("Tlio  black  at  tho  tip  of  tho  hind  tibi.o  rather  oxtendod  and  not  very 
j  sharjily  liniittMl.  4  albiciliatiis  Am-. 

I  The  black  at  the  tij)  of  tho  hind  tibia'  but  little  extended  and  sharply 
(.         limited.  •>  xaiithocneniuB,  n.  .-i). 

^  (  A  considerable  extent  of  the  tip  of  the  femora  yellow,    (i  tetricus,  n.  sp. 
I  The  extreme  tip  of  tho  femora  only  somewhat  yellow.  8 

LamelliB  of  the  hypopygium  jwiutod.  7  acuminatus  I.n', 

fs  ovatuB  /■"•. 
10 
11 
!^  pachycnemus  f.w. 
10  brevipennia  Mn'ij. 
12 
23 

,.,  f  Antennie  black,  at  tho  utmost,  tho  first  joint  almost  red.  1)5 

t.  Antonna»  altogether,  or  at  least  their  larger  portion,  yellowish  red.     121 
f  Fore  coxiB  dark  beyond  tho  mid<llo.  11  longimaiius  /.ir, 

14 
16 
t  Tip  of  tho  hind  tibiio  not  or  very  slightly  infuscated.  16 

,,.  f  Fore  tarsi  only  ferruginous-brownish.  12  brevimanus  f.w. 

\  Fore  tarsi  blackened  from  tho  tip  of  the  first  joint.         liJ  socius  /.n: 
.  (  Hind  tarsi  entirely  black.  17 

•■  Hasis  of  the  hind  tarsi  i)ale  to  <a  considerable  extent.  19 

f  Hind  femora  of  tho  male  not  ciliated.  14  nudus,  n.  sp. 

I  Hind  femora  of  the  male  ciliated.  18 


,..  (  F'oro  coxio  blac 

'  Fore  cox;o  yell 
, .  (  Tegulio  with  jialo  cilia. 

(  Teiiubo  with  black  cilia, 


13  , 

t  Fore  coxae  pale. 

-J  ,  f  Tip  of  tho  hind  tibiio  decidedly  blackish 


It 
17 


pi 


I  . 


'•I 

mi 


» '  j  ■  'Iff* 


f;     C.-l 


ill 


!  I 


I!  ; 


til!iJ:ll.i 


!  •'!;!' 'I 'I 


26 

IS 

lit 

2l» 
21 

O.) 

23 
24 


DIPTEllA  OF  NORTir  AMERICA. 


[I'AKT  II. 


I 


18  eudactylus  /.lo. 

Ill  tonsils  Lw. 

2u  tener  /."•. 

-1  variabilis  /.»•. 

22  luteipeiiuis  /.ic 

2-4 

28 

23  ramifer  f.iv. 

25 


20 
27 

28 

29 

30 
31 
32 

33 

34 
35 

30 


Hind  femora  of  tho  male  with  spar.su  ami  rather  short  cilia. 

15  subciliatus,  ii.  sp. 
Hind  femora  of  tho  male  with  very  long  and  dense  cilia. 

Ill  splendidus  /-«;. 
Only  the  last  joint  of  the  foro  tarsi  of  tho  male  is  enlaigcd. 

17  batillifer  Lw. 
The  two  last  joints  of  the  fore  tai'si  of  the  male  are  cnLuged.  20 

Hind  femora  of  the  male  eiliatt'd. 
Hind  femora  of  tho  male  nut  ciliated. 
Last  joint  of  the  fore  tarsi  of  tlie  male  enlarged. 
Fore  tarsi  or  the  male  iilain. 
Willis  hyaline  with  a  yrayisli  tinge. 
Wings  hyalim;  with  a  .-cUowish  tinge. 
Fourth  longitudinal  vein  broken. 
Fourth  longitudinal  vein  not  broken. 
Antjnnju  black. 
Antenna;  yellowish-red. 
Fourth  longitudinal  vein  broken  twice  at  right  angles.  24  bifractusAw. 
The  inferior  angle  of  the  fourth  longitudinal  vein  sharp,  the  superior 

one  roundeii.  2G 

Tarsi  of  the  male  plain.  25  vittatus  Lir. 

Tarsi  of  the  male  eiilartretl  at  the  tip.  27 

Hind  femcra  of  the  male  ciliated.  20  cuprinus  ]\le(l. 

Hind  femo'a  of  the  male  not  ciliate<l.  27  loiigipennis  /.iv. 

Antenna;   red,  at  the   utmost  the  third  joint  somewhat  or  altogether 

blackened  at  the  tip.  29 

AntenniB  black,  at  the  utnuist  the  first  joint  partly  red.  30 

Humeral  callosity  of  the  same  color  with  the  u'>'>er  side  of  the  thorax. 

30 
Humeral  callosity  yellowish.  35 

Ai'ista  much  enlarged  towards  tin;  tip  in  the  male.  2S  hastatus,  n.  sp. 
Arista  of  the  male  not  enlarge<l.  31 

Last  joint  of  the  fori^  tarsi  not  eidarged  in  tho  male.  32 

Last  joint  of  the  foi'e  taisi  enlargi'd  in  the  male.  33 

First  joint  of  the  male  middle  taisi  feathered.  211  pltimipes  Scop. 
First  joint  of  tho  male  middle  tarsi  not  feathered.  3(i  fvilvipes  Lir. 
Last  joint  of  the  male  fore  tiirsi  with  a  lamellifurm  iiiipendage. 

Ill  sexarticulatus,  n.  sp. 
Last  joint  of  the  male  fore  tarsi  without  lamelliform  appendage.       34 


Last  joint  of  the  male  fore  tarsi  small. 

I^ast  joint  of  the  male  fore  tarsi  largo. 

Fere  tarsi  of  the  male  j>lain. 

I''ore  t/usi  of  the  male  eidarged  at  the  tij). 

Face  dark  gohlcn-ycliow. 

Face  not  golden-yello\7. 


32  ruficoniis  Ac. 

(411  lobatus  /.»'.) 

33  scapularis  /.«'. 

34  funditor  Lw. 

35  chrysostomus  Lw. 

37 


}'^ 


DOLICIIOPIS. 


27 


37 

38 
3'J 


40  \ 


41 
42 


Tip  of  the  liiiul  fomora  iiifuscated  above.  38 

Tip  of  tho  liiiul  femora  not  iiifuseated  above.  39 

Fore  femora  on  tlu!  under  side  witlx  a  blaek  stripe.  3G  praeustus  Lir. 
Fore  femora  witliout  blaek  streak.  i>7  comatus  />«•. 

Fore  tarsi  black  only  at  the  tip.  40 

Fore  tarsi  black  from  the  tip  of  the  first  joint.  41 

Two  last  joints  of  the  male  fore  tarsi  but  little  enlarged,  feathered 
with  black.  158  scoparius,  n.  sp. 

Two  last  joints  of  the  male  fore  tar^i  enlarged,  not  feathered. 

31t  discifer  S/aun. 
Last  joint  of  the  male  fore  tarsi  very  mucdi  enlarged.  40  lobatus  /./'•. 
Fore  tarsi  of  tho  male  plain.  4'1 

Bristles  of  the  hind  tibiic  longer  than  usual.  41  setusus  Lw, 

Bristles  of  the  hind  tibi.e  uot  lon^rer  than  usual.     42  incisuralis  Liv. 


>Mi 


i>.» 


Systematic  distrlbittlon  of  the  Species, 


I.  Prevailing  color  of  the  feet  black. 
A.  Cilia  of  tlie  inferior  orbit  black. 


1.  gf^tus  Lw. 


2.  laticornis  Lw, 


B.  Cilia  of  tho  inferior  orbit  whitish. 

3.  setifer  Lio.  (!.  tetricus,  n.  sp, 

4.  albiciliatus  Lw.  7.  acuminatus  Ltc. 

5.  xanthocnemus,  n.  sp.  8.  ovatus  Liv, 


II.   Prevailing  color  of  the  feet  yellowish. 

A.  Cilia  of  ihe  inferior  orbit  black. 

9.  pachycnemus  f.w.        10.  brevipennis  Mclij, 

B.  Cilia  of  the  infeiior  orbit  pale. 

A.  Cilia  of  tho  teguhe  pale. 

1.  Antenn.'o  black,  the  first  joint  at  the  utmost  partly  red. 
11.  longimainiB  Lir.  10.  splendidus  f.w. 


17.  batillifer  A»', 

18.  eudactylus  Lie. 
I'd.  tonsus  Lw. 


12.  brevimanus  Jjw. 
iS.  socius  /.»'. 

14.  nudus,  n.  sp. 

15.  subciliatus,  u.  sp. 

2.  Antonnne  entiiuly,  or  their  greater  portion,  yellowish  red. 

20.  tener  Lw.  22.  luteipennia  Lw, 

21.  variabilis  Lw. 


:i:-      V\    ■" 


■  l-  ■ 


II   •; 


28 


DlI'TKllA  OP  NORTH  AMKUICA. 


[I'AIIT  II. 


B.  Cilia  of  tlie  tcguhe  black. 

1.  Fourth  longitudinal  vein  broken. 

a.  Antenna)  black. 

23.  ramifer  Lw. 

I.  Antennae  yellowish-red. 

24.  bifractus  A>(t'.  2(j.  cuprinuB  Lw. 

25.  vittatuB  Ari'.  27.  longipenuis  Lw. 

2.  Fourth  longitudinal  vein  not  broken. 

a.  Antenn;e  red,  at  the  utmost  the  third  joint  at  the  tip 
almost  entirely  red. 

a.  Humeral  callosity  of  the   same  color  with  the 
thorax. 

28.  hastatus,  n.  sp.  31.  sexarticulatUB,  u.  sp. 

2d.  plumipes  Scnp.  32.  ruficorniB  Lii\ 

30.  fulvipes  Lie. 

B.  Humeral  callosity  yellowish. 
33.  Bcapularis  /-"•.  34.  funditor  Tao. 

h.  Antennre  black,  at  the  utmost  theifirst  joint  partly  red. 
35.  chrysostomus  Lw.     3!).  discifer  Stmin. 
3(5.  praeuatus  /av.  40.  lobatUB  Lw. 

37.  comatus  Lw.  41.  setosus  Lw. 

38.  acopariuB  Lw,  42.  incisuralis  Lw, 


mm 


;;if 


':y" 


DOLICIIOI'US. 


PESCIUPTION  OF  THE  SPECIES. 

I.    PUEVAII.INa    COLOR   OP    TIIE    FEKT    IJLACK. 

A.    Cilia  of  the  inferior  orbit  blarl: 

1.  D.  [;ratlis  Loew.  %  . — Kx  viridi  ch.ilybinis,  pedum  nigrorum  tiMFs 
anterioribiis  totis  tibianiimnie  jiosticiirum  diiiiidio  basali  llavis,  facie 
ochracea,  eilii.s  ouulorum  inferioribus   tcgulaiuuujiio  ciliiri  nigiiis. 

Bluisli-areen,  feet  black,  the  four  anterior  tibia'  cntiicly,  tlie  two  liiiid  oiiei* 
upon  the  basal  half  j'ellow;  face  ochre-brownisli ;  cilia  of  tlie  inferior 
orbit  and  of  the  teguUe  black.    Long.  corp.  (1.23 — U.24.    Lung.  al.  0.21. 

Svx.  Dolicliopiis  ijrutiis  Loew,  Neue  Beitriige,  VIII,  11,  1. 

IJluish-orcen.  Tlie  narrow  face  ocliro-brownisli.  AntonnaJ 
black;  tlie  lirst  joint  rather  niirrow.  Front  metallic  liluisli-<rreen. 
The  cilia  of  the  inferior  orhit  l>lack.  Laniellte  of  the  liypo|iyn'iiini 
whitish,  of  moderate  size,  on  the  ni)i)er  and  the  apical  nuu\uiii  with 
a  moderately  l)road  hlack  border;  the  apical  nnir.u'in  somewhat 
jagfred  anil  frinj>H'd  with  numerous  black  l)ristles.  FeuKU'a  black, 
with  yellow  tip;  the  hind  femora  rather  stout,  ])rovidcd  with  a 
bristle  before  the  tip;  upon  the  under  side  ciliated  with  lon,<r  black 
liair;  the  four  anterior  tiltiie  and  tarsi  yellowish,  the  latter  ones 
l)ut  little  darker  towards  the  tip;  hind  tibiie  sonn-what  thickened, 
the  apical  half  and  the  whole  of  their  hind  .<ide  l)hick,  the  remain- 
inj^  parts  yellowish;  hind  tiirsi  »piite  I)lack,  the  lirst  joint  with  \'v\v 
bristles.  Teii'uhe  with  stroiijr  black  cilia.  Winti-s  hyaline,  the 
eosla  is  thickened  before  the  tip  of  the  lirst  lonii'itudinal  vein,  and 
only  very  <rradually  attenmited  beyond;  the  end  of  thi'  fourth  lon- 
gitutlinal  vein  converu'es  towards  the  third. 

llah.  Trenton  Falls,  West  Point,  Fali-sades,  etc.,  X.  Y.  (O.s- 
ten-Sacken.) 


7...>-  '■■■  :*  \IA\i\ 


^m. 


wmm 


1-^^ 
h:^ 


n 


3«  D.  laticoi'ilis  Lokw.  ^  . — Viridi.s  pedum  niarorum  tibiirf,  oxcepto 
posticarum  apice,  llavia,  facie  alba,  ciliis  oculorum  inferioribus  uigrid, 
tegularum  ciliis  albis. 

Green,  feet  black;  tibia-,  excepting  the  tip  of  the  hind  ones,  yellow;  face 


'f\-^ 

r  » 


so  ■  DirXERA  OF  NORTH  AMKHICA.  [PAKT  II. 

white  ;  cilia  of  the  inferior  orbit  hliick  ;  cilia  of  the  teguhe  white.    Long. 
Corp.  (1.17.     Long.  al.  (Mri. 


Sin. 


I' 


iliclb 


'!'• 


I'iti 


is  Loew,  Neiie  Heitr.  VIII,  12,  2. 


net'   \v 


liitc,   ratlu'V   broad   lor  ii  iiiii]( 


Aiiteiniii!  black;    the 


third  joint  laru-e  and  hn;  id,  ovate;  arista  iiisortfd  upon  its  second 
tliird.  Front  metallic  jri'cen.  'J'he  cilia  of  the  inferior  orl)it 
lilacii.  lianielke  of  the  hypoityfiMiiin  rather  small,  of  u  trape/oidal 
form,  the  upper  and  apical  iimrti'in  are  hut  very  little  bordered 
with  black;  their  mar<j,'in  is  not  jaji\u'ed  but  only  frin<>-ed  with 
minute  black  hairs.  Tij)  of  the  co.\;e  yellow.  Femora  black, 
with  a  faint  ji'reenish  reflection  and  yellow  ti}).  Tibise  yellowish, 
('riio  middle  til)iie  are  wantinjjj  in  the  described  specimen.)  Tho 
tip  of  the  hind  tibia',  which  are  not  thickened  at  all,  is  black. 
I'ore  tarsi  from  the  tip  of  the  first  joint  black;  hind  tarsi  entirely 
l)lack  ;  the  first  joiid  is  beset  with  a  \V\v  tiiorn-like  bristles.  Ifind 
femora  before  the  tij)  with  a  stout  bristle.  Teji-uhe  with  whitish 
cilia.  AVinii's  hyaline;  the  costa  ))ut  scarcely  thickened  about  tho 
tip  of  the  first  lonji'itudinal  vein  ;  the  end  of  the  fourth  lonjritii- 
dinal  vein  conver<i"es  towards  the  third. 
JJab.   Connecticut.     (Xorton.) 


m. 


.in 

k 


m. 


B.   Cilia  of  the  infer  ii)!'  orbit  pale. 

3.  I>.  SCtifc'l'  Loiav.  %  . — Obscure  viriilis,  pedum  nigvonim  tihiis  an- 
terioribus  piisticiuinnque  diiiiidio  basiili  llavis,  facie  alba,  ciliis  oculoriuu 
inferioribus  tegularuuique  ciliis  albidis,  nietatarso  postico  valde  setoso. 

Dark  green;  feet  black,  the  four  anterior  tibia'  ,'ind  the  basal  half  of  tlio 
two  hind  ones  yellow;  face  white;  the  cilia  of  the  lower  orbit  and  of  the 
tetrul.'c  whitish  ;  the  first  joint  of  tin;  hind  tarsi  with  many  thorn-like 
bristles.     Long.  corp.  0.17.     Long.  al.  0.1.'. 

Syn.  Doliclmiiiis  sctifrr  Loew,  Neue  Ueitr.  VIII,  12,  3. 

Face  silvery-white,  lutrrow.  Antenna'  black,  third  joint  sliort. 
Front  metallic  a-reen.  The  cilia  of  the  iiiferi(jr  orbit  whitish. 
The  lamella'  of  the  liyi)opy<iium  whitish;  their  lone:  apical  umrfin 
is  finely  jau'u'ed  only  l)elow  and  frinu'cd  with  lonu,"  bristles,  above 
only  finely  hairy;  its  lower  corner  has  a  narrow  black  border. 
The  l)hick  femora  show  a  ji'reen  reflection  and  have  a  clayish-yel- 
lowti]);  the  hind  femora  have  a  bristle  Itefore  their  tip  and  are 
ciliated  on  their  under  side  with  lonji'  black  hairs  ;  the  four  anterior 
tibitu  are  ehiyish-yellow;  the  first  joint  of  tho  four  anterior  tarsi 


,■  '■'A'. 


i: 


DOLiciroptrs. 


31 


is  of  tlio  same  color;  its  tip  mid  tlic  rt'iiiainiiiu:  joints  arc  Muck. 
Tilt!  liiiul  tibiiP  arc  Itlack;  upon  tiicir  nppci-  side,  IVom  the  l)aso 
beyond  the  middh",  chiyisii-yenow ;  towiirds  their  tip  I)iit  little 
tliickcncd;  tlio  first  jnint  of  the  hind  tiirsi  is  covered  with  iiiuny 
tlionidikc  ))ristles.  Tco'idn;  with  whitish  ciliii.  Winn's  entiivly 
hyaline,  towards  the  l)asc  soinewluit  wcdu'c-sliapcd,  with  a  lihudc 
8})ot  wliicli  occupies  tlieir  very  tij).  Tho  c(Kta  is  hardly  tliickcncd 
near  the  tip  of  the  first  l()ii<j;itndinal  vein;  the  end  of  the  Innrth 
lonii'itndinal  vein  convcr;i:es  towards  the  third. 

llab.  District  (Jolnnil)ia;  Trenton  Falls,  X.  V.  (Ostcn-Sacken.) 


:  ;•?': 


4.  I>.  albiciliatiiH  Lok' 


9. — 01)scure   viridis,   poflnin    iiitriornni 


tiliiis,  posticarum  apice  taiui'ii  exc('))to,  tarsorumiiue  aiitcrionmi  l)asi 
fiavis,  facie  alba,  cilii.s  ociilonim  iiitV'rioribus  all)is,  tegularuiu  ciliiij 
nigris. 

Dark  groen  ;  feet  Mack,  tibi.T,  oxoepting  tho  tip  of  the  liiiid  ones,  and  tlie 
basis  of  tlie  four  anterior  tarsi,  yellow;  face  wliite ;  cilia  of  the  inferior 
orbit  white;  cilia  of  tin?  tegulie  l)lack.    hong.  corp.  (MiO.    hong.  al.  l».20. 

Syn.  Diilichujius  alliiciHalus  hoEW,  Berl.  hnt.  Monatschr.  VI,  211,  f)!). 

Dark  preen.  Face  jiroportionally  rather  broad,  white.  An- 
tcnnii;  black,  third  joint  short.  Front  nietalb"  u'reen.  Cilia  on 
the  inferior  orltit  white.  Femora  black,  with  a  fi'rcenisli  reflection, 
their  extreme  tip  brownish-yellow;  (Mi  tli<  under  side  of  the  hind 
femora  the  hairs  are  somewhat  lonj^-cr  than  in  the  related  species, 
and  of  such  a  kind  as  to  lead  to  the  sniiiiositiini  that  the  male  has 
the  hind  femora  ciliated  with  black.  Tibiie  yellow,  the  tip  ol"  the 
hind  ones  l)lack;  this  black  colorin.ti'  occupies  on  the  anterior  side 
perhaps  the  fourth,  on  the  hind  side  nearly  the  third  ])art.  On 
the  four  anterior  tarsi  the  four  last  joints,  includint;'  the  tip  of  the 
first  joint,  are  black;  the  hind  tarsi  iirc  entirely  lilack  ;  their  first 
joint  is  as  long'  as  the  second,  upon  its  upper  side  with  two  bi'is- 
tlcs,  and  ui)on  its  under  side  with  one.  Cilia  of  the  teyuUe  black. 
"Winji's  hyaline. 

Jlah.  Illinois.     (Le  ]>aron.) 

5.  D.  xailtliocneinus,  n.  sp.  %  and  9.— 01)scnre  viriiHs,  pedum 
iiigrornm  tibiis,  posticarura  apice  tamen  excepto,  tars()vnni(|ue  anterionnn 
hasi  tlavis,  facie  alba,  ciliis  nculoruni  inferiori\)US  albis,  tegularuiu  ciliis 
nigris,  fenioribus  maris  posticis  aU)0-ciliatis. 

Dark  green;  feet  black,  tibia-,  excepting  the  tip  of  the  hind  ones,  and  tht) 


i    .'I 


^k:     IP^ 


!:>■       il 


,1 


•   (I 
I 


I-; 


4!'' 


32 


Ml'TEUA  <»P  NOllTir  AAIKRTCA. 


[l>AUT  II. 


Ij.isg  of  the  four  anterior  tarsi,  yi-llow  ;  face  white;  cilia  of  the  inferior 
oihit  white;  cilia  of  Uie  tetrulie  black;  hind  femora  of  the  male  ciliated 
with  white.     Long.  corp.  0.1") — U.IO.     Long.  al.  0.17 — 0.18. 

Ill  the  color  and  cvon  tlie  structure  of  the  body  this  sjjccios  rc- 
scnildcs  />.  (ilhlcilialun ;  but  it  is  much  smaller.  Face  white,  that 
of  the  male  rather  narrow,  that  of  the  female  jtroportionally  rather 
brnad.  Paljii  blackish  at  the  base,  at  the  ti})  more  yellowish  and 
with  a  somewhat  whitish  reflection.  Antenme  black;  third  Joint 
railicr  short,  in  the  J*  somewhat  larji'cr  than  in  the  9.  Front 
metallic  {rreen.  Cilia  of  the  posterior  orbit  black  alxne,  white  on 
the  sif'e  and  l)elow.  Coxic  black,  trochanters  brownish-yellow. 
The  fore  co.xtc  dusted  on  their  fore  side  and  beset  with  black  hair. 
Femora  ))lack,  with  ))rownish-yell(JW  tip,  the  hind  ones  before  the 
ti|)  with  a  l)ristle.  The  hairs  of  the  femora  are  ])lack,  but  there 
are  on  the  under  side  of  the  four  anterior  femora  of  the  male  some 
delicate  and  short  white  Iniirs.  The  under  side  of  their  hind 
femora  is  ciliated  with  very  long  white  hairs;  upon  the  under  side 
of  the  anterior  femora  of  the  female  the  hairs  are  chjser  than  in  the 
male,  and  show  a  whitish  a])])earaiice  only  in  a  certain  direction, 
whilst  in  another  direction  they  a])i)ear  rather  blackish.  Tibia) 
yellowish  ;  the  land  tibio)  are  colored  with  black  at  the  tip;  this 
l)lack  coloriuff  has  but  a  moderate  extent  and  is  rather  sharply 
linnted.  Tarsi  plain  in  both  sexes;  on  the  four  anterior  ones 
the  tip  of  the  first  joint  and  the  four  f(dlowinji-  joints  arc  co- 
lored black;  the  hind  tarsi  are  entirely  black ;  in  the  male  their 
first  joint  has  more  thorn-like  bristles  than  in  the  female.  Cilia 
of  the  tcfi'ula)  black,  but  mixed  with  nunnte  white  hairs,  as  it  is 
also  the  case  with  the  related  species,  for  instance  with  />.  alhici' 
lintus.  "Wings  grayish  hyaline;  in  the  nude  the  anterior  margin 
has  at  the  tip  of  the  first  longitudinal  vein  a  small  knot-shaped 
swelling.  The  white  lamelhe  of  the  hyj)oi)ygium  are  of  a  rounded- 
ovate  form,  bordered  with  black,  jagged  on  the  ujiper  and  apical 
margins  and  friyged  with  black  bristles. 

Hab.  Sitka.     (Sahlberg.) 

OJiticrvafion. — Between  the  diagnosis  of  this  species  and  that 
of  I),  albiciliatus  there  is  no  difference  with  regard  to  the  female 
sex  except  in  the  size.  Indeed  the  females  of  both  species  are 
very  'Much  alike.  In  order  to  distinguish  them  it  will  be  well  to 
bear  in  mind  that  the  female  of  D.  a-anthocnemus  is  not  only 


i:i^. 


DoLicnorus. 


83 


imicli  smaller,  but  that  the  iiKMsurcs  of  its  ahdonion  nro  loss 
l>lafkeiieil,  that  the  black  coloriiifr  uii  the  tii»  of  its  hind  tibiiu  is 
less  extended  and  more  sliar])!}'  limited,  and  that  liinilly  the  short 
liairs  nj)on  the  under  side  of  its  fore  and  middle  femora  have,  in 
a  reflected  light,  for  the  most  l)art  a  whitish  appearance,  whilst  in 
the  fenmle  oi  1>.  ulhicilialiiK  this  is  the  case  univ  in  the  proxinutv 
of  the  base  of  the  fure  femora. 

6.  I).  tl'tricilA,  n.  sp.  %  and  $> . — Obscure  viridix,  rariua  cni.ipus, 
antennis  pediluisiiue  nigiis,  ai)icali  ffinoiuui  tiieiite  testaceo,  inlV'iiuiilni* 
oculorum  ciliis  llavicantilxis,  alls  cinoreis.  ^.  Facio  exochraceo-ciiie- 
rea,  laiiitdlis  hypopycii  alliidis,  ultimo  tarsoruin  anticoriim  articiilo 
dilatato,  tibiis  posticis  cnisi.siusculi^s.  ^.  Faciu  albiila,  pedibus  simpli- 
cibus. 

Dark  green,  seblom  coppery;  antenn.T  and  feet  black,  the  last  tliird  of  the 
femora  brownish-yellow;  cilia  of  the  inferior  orliit  yellowish;  wings 
grayish.  ^  .  Facre  yellowish-gray  ;  laiiiellie  of  the  hypopygiuni  whitisli ; 
the  last  joint  of  the  fore  tarsi  enlarged  :  hin<l  til>iie  somewhat  thickened. 
9.  Face  white;  feet  plain.  Long.  corp.  0.18— 0.20.  Long.  aL  0.20— 
0.22. 

Dark  jrroen,  Ijrijrht ;  the  last  se<iineii{s  of  the  abdomen  are 
usually  dark  bronze-colored,  and  sometimes  the  color  of  the  body 
is  everywhere  very  coi)pery.  Anteniue  black;  the  third  joint 
almost  ronml,  still  with  a  sharp  projection  at  the  tip.  Front  me- 
tallic o'reen.  The  face  of  the  male  not  very  narrow,  yellowish  trray ; 
the  face  of  the  female  much  broader,  whitish.  J'alpi  bhick,  dusted 
with  whitish  on  the  edjic,  jjarticuhirly  in  the  fenmle.  Cilia  of  the 
inferior  orbit  yellowish,  sometimes  nearly  whitish.  Ilypopyjiiuni 
with  elliptic,  whitish  lamclhe  of  moderate  size,  which  are  bordered 
with  black  on  the  upper  and  apica'  inaririn  ;  the  latter  is  somewhat 
jajrjiod.  Coxie  black  ;  fore  coxte  with  black  hair.s  and  bristles,  only 
very  slightly  dusted  with  white.  I<\'et  black;  the  last  third  of  the 
fore  aud  middle  femora,  as  also  somewhat  nu)re  than  the  last  (piar- 
ter  of  the  hind  *"emora,  reddish  luteous-yellow  or  almost  yellowish- 
red;  the  hind  femora  before  the  tip  with  a  seta,  not  ciliated  uj)oii 
their  under  side,  even  in  the  J*.  The  tibiie  show  only  at  the  very 
extreme  base  a  lighter  color;  in  the  9  all  til)iie  are  of  a  i)laiii 
structure,  in  the  (^  the  hind  tibiae  are  conspicuously  thickened. 
The  9  has  plain  tarsi,  in  the  male  the  last  joint  of  the  fore  tarsi 
is  flattened  from  the  side,  and  enlarged  above  into  a  lobe;  the 
first  joint  of  the  hind  tarsi  in  both  sex-s  is  but  little  fringed  witU 


Xj  I 


'     H 


'    !l 


:.'  ■;   i 


1 

m 


■!!■;• 
■  li' . 

5^'  ■; 

i' 

1 

! 

1 

34 


PIPTKUA  OF  XoKTII  A'.II.KICA. 


[I'AUT  M 


tlioni-likc  bristles.  Cilia  of  tlic  tcjrulic  black.  'Wings  grayish 
with  hrowiiish-ltlat'k  veins;  the  hi.vt  section  of  the  fourth  longi- 
tudinal vein  has  a  ralher  ^lrong  tlexure  in  tin;  middle,  but  from 
that  jioint  runs  nearly  parallel  with  the  third  longitudinal  vein; 
the  J"  has  no  swelling  of  the  eosta  at  the  tip  of  the  first  loi!j;:- 
tudinal  vein. 

JIah.   Fori  llesolutlon,  lluds.  IJay  Territory.     (Ivennicott.)' 


T.  !)•  acilllliiiatlls  Loew.  %  nnd  9. — Obsruro  viriflis,  piHlnni  nf- 
grorum  tibiis  anticis  ex  flavo  fiiscis,  tacie  allul,  ciliis  ociiloruiu  inferiori- 
bus  alliis,  tegularum  ciliis  iiigris,  laiiicllis  l»y[)opyj5ii  iiiagnirt,  auiitis. 

Dark  green ;  tlio  fet*t  black,  fore  tiliia;  biowiiish-yHllow  ;  fice  whito;  cilia 
of  tilt)  inferior  orbit  wliite,  of  tlie  teguhf  black ;  tlie  large  lanieli;e  of  tb« 
Iiypo'iygium  pointed  at  the  enil.  Long.  corp.  0.15.  Long.  al.  0.14 — 
Clf). 

Sy.n.  Dolirhopus  nruinlndfus  LoEW,  Nene  Beitr.  VIII,  12,  4. 

3fah'.  Dark  green.  Face  tmrrow,  white.  .;\ntenna;  black; 
their  third  j\)int  short.  Front  metallic  green.  Lamelhe  of  tlit; 
liypopyginm  white,  large,  spatide-shnped,  pointed,  so  that  tht» 
upper  and  the  lower  nuirgin  strike  together  and  there  is  no  dis- 
tinct apical  margin ;  the  upper  one  has  a  narrow  black  border 
and  is  ciliated  with  minute  blai-k  hairs.  The  black  femora  with 
a  bluish-green  reflection,  and  their  extreme  tip  brownish-yellow; 
fore  t'bisc  upon  the  greatest  jjart  of  the  u])per  side  brownish-yel- 
low,  dark  brown  beneath;  fore  tarsi  brownish-black  with  yellow 
base;  middle  til)ia>  and  middle  tarsi  browni^l!-l)lack.  still  the  base 
<»f  the  latter  yellowish-Iirown ;  hind  tibiae  and  himl  tarsi  entirely 
black,  the  latter  sparsely  bristly  upon  the  first  joint.  Cilia  of  the 
teguUe  black.  Wings  hyaline ;  the  costa  at  the  tip  of  the  first 
longitudinal  vein  not  thickened  ;  the  end  of  the  fourth  vein  con- 
vertring  towards  the  third;  the  hind  transverse  vein  somewhat 
less  steep  than  in  D.  ovnfus. 

Female.  Very  much  like  the  male.  The  white  face  much 
broader  than  in  the  male,  still  not  so  Ijroad  as  in  the  female  of 
7).  albieiliafi(s.  The  yellow  coloring  upon  the  upper  side  of  tli*' 
fore  tibiic  is  not  only  generally  lighter  than  in  the  J*,  but  also 
often  distinctly  observable  upon  the  first  half  of  the  U])per  side  of 
the  middle  tibiic. 

Hub.  Washington.     (Osten-Sacken.)     Illinois.     (Lo  13aron.) 


;■■   '*'K  . 


Imr.TfllniMS. 


J.y 


8.  D.  ovntlls  liOFW.  %  . — Ohscive  viiiilis,  pt'dinn  Tiiu'i-oruiii  tiliiis  nn- 
ticis  ex  ti/ivo  fusi-is,  f.icii'  alliil,  I'iliir^  ofulonim  iiit'eriorilpiis  alhidis,  teuu- 
l.irum  ciliis  nigris,  lainellirf  liyjiopygii  parvis,  rotuiidato-ovntis. 

Dark  green  ;  feet  lilafk,  forci  tiliiie  Itrowiiisli-yellow  ;  face  wliite  ;  ciliiv  of  tlnj 
inferii-r  orbit  wliitisli,  of  the  teculje  Mack;  luiiiellai  of  tiie  liyimpvLiiiim 
small,  rouiiiU'd-ovate.     Loiij^.  corp.  (Mfi.     Long,  al.  tM4 — U.l.'j. 

Syn.  Dolirlin/Dis  nnitiis  LoKw,  NeuH  Beitr.  VIII,  13,  5. 

Fiu'c  narrow,  white.  Aiilciiiiii'  Idnck,  lliinl  juiiit  sliort.  Frniit 
liK'tallic  frrt'*'!).  Ciliii  of  the  iiiferior  nrhit  whitish.  I.iUiii'llie  of 
the  hypopyiriuin  while,  rntlier  siiiiill.  rotiiKlisli-ovate,  on  tlie  iiii|i('r 
and  ai»ieal  iiiar}j;in  with  a  narrow  black  lionler,  on  tlie  hitter  split 
into  a  ))ristle-like  lohe  and  t'rinired  with  hlaek  lirislles.  I''ect, 
bhiek  ;  the  femora  with  a  .>ioinewhat  jrreenish  reflect  inn  ;  their  e\- 
trenie  ti^»  hrownish-yellow;  the  root  of  the  fore  and  inidtlle  tarsi 
are  of  the  «anie  color.  Fore  til)ia'  npon  the  jrreatest  jiart  of  the 
upper  side  hrowiusli-yellow.  l)eneath  dark  brown.  Middle  iii)i;i; 
and  middle  tarsi  l)rownish-bla('k.  Hind  tibiu'  and  hind  tarsi 
Ijlaek.  Cilia  of  the  teo-nhe  l)lack.  Wings  hyaline  ;  tlie  cnsta  iif. 
the  tip  of  the  first  longitudinal  vein  not  tinckened.  The  end  of 
the  fourth  longitudinal  vein  converges  towards  the  third  ;  the  liind 
transverse  vein  straight  and  steep. 

JTab.   Middle  States.      (Osten-Sacken.) 

Observation. — The  J  of  J>.  (>r(ili(f>,  wliicli  is  not  known  to  me, 
must  resemble  very  much  that  of  /).  aciimindlnK.  IJcsides  the 
but  slight  discrepancy  in  the  color  of  the  feet,  the  dilference  con- 
sists i)robab!y  in  the  coarser  hairs  on  the  fore  co.xie ;  at  least  ih" 
hairs  in  the  ^^  of  D.  ov(ifii!<  i<re  coarser  and  also  longci'  than  in 
that  of  ./A  (tciiii>iit(itii.-i.  The  difference  in  the  direi'll<in  of  the 
hind  transverse  vein,  in  the  males  of  both  species  is  not  suHieient, 
to  be  relied  upon  for  an  easy  discrimination  of  the  J  of  llie  same 
species. 


I.  : 


!  ;(!■ 


.; ,  '  »'n 


■f. 


1^     li 


II.   Prevailing  roi,ou  of  the  feet  VELLowisir. 
A.    Cilia  (if  the  inferior  orhit  hla<h\ 

9.  D.  pacliycneiniis  Lomv.  %,  and  9- — Aeneo-viiidis,  antennn, 
oculonirn  tegularunnnie  ciliis  nigris,  coxis  oninilms  totis  <il>S(iiiis,  ju'di- 
bus  flavis,  diniidio  tibiarutn  posticarum  apicali,  tarsi.s  inteiniediis  indrt 
ab  articuli  primi  ajiioe,  posticis(]ne  totis  nigris. 

%.  Tarsis  anticis  attenuatis,  artieulis  tribus  ultiniis   atri.-^,  conipressi.s, 


■■  (■' 


J,-     ■■ 

i':.':i ' 

■  -■; 

;,■■■■    ''  ■•'  "" 

.,■'■' 

't-4 


m 


u. 


8G 


DTPTEUA  OF  NoRTir  AMKRIPA. 


[part  It, 


dunbufl  ultitnis  valde  diliitiitiH,  feiuoril)U!i  i)OHt!uia  nigro-uiliutiH,  tibiit 

9*  IVdibud  HiiiiplivibuH,  tai'!ti8  autiuL-i  iiide  ab  nrtiuuli  primi  apice  iiigrld. 

Metallic  gruttn  ;  aiiteiinnD,  ciliu  nf  tlie  iiift* rior  orbit  and  of  tliu  tHgulio  black  ; 

all  coMu  untiivly  diuk  ;   Unai  yellow  ;  tlic  wliolu  Hucuiid  liult'  ut  tbc  hind 

tibiiv,  tliH  middle  turui  from  tlin  tip  of  the  liriit  joint  iind  the  whole  hind 

tarxi  bluck. 
^  .  Fore  tarsi  attenuated ;  the  three  last  joints  black,  compressed,  tlie  two 

last  joints  much  enlarged;  hind  femora  ciliated  with  bluck;  hind  tiliiu) 

incrassated. 
5  •  Feet  plain,  fore  tarsi  from  the  tip  of  the  lirst  joint  blackened.     Long. 

Corp.  0.25— 0.2t).     Long.  al.  0.22. 

Syn.  Dolichopus  parhyr.nemna  LoKW,  Neue  Beitr.  VIII,  13,  6. 

Dark  metallic  grocii,  brijrht.  Face  of  the  J*  narrow,  ocliri'-ycl- 
low;  face  of  the  9  l)r()a(l,  •rrayish-ycllow.  Aiittiiiiio  entirely 
Mack;  the  third  joint  ovate.  Front  hrij^ht,  {generally  for  the  most 
l)art  steel-blue.  The  cilia  of  the  inferior  orl)it  Ithick.  Thorax 
with  a  rather  broad  brass-cohjred  middle  line.  i\bdomen  cojjjtery 
towards  the  end.  All  the  coxiu  black,  only  their  extreme  tip 
somewhat  brownish-yellow.  Feet  dark  yellow ;  hind  femora  on 
the  extreme  tip  darker,  before  the  same  with  a  stronj;-  l)ristle;  all 
tibiie  with  numerous  bristles;  hind  til)iiu  upon  the  entire  second 
half  i)lack;  middle  tarsi  from  the  tip  of  the  lirst  joint  black; 
hind  tarsi  entirely  black.  Teji'uke  with  black  cilia.  Wii\{?s  some- 
what shorter  than  usual,  in  the  9  somewhat  more  dusky  than  iix 
the  male,  esj)ecially  somewhat  darker  towards^  the  fore  nmrgin. 

Male.  Fore  tarsi  not  very  much  loiijfcr  than  the  fore  tibiae; 
their  lirst  and  second  joints  slender,  stalk-like,  yellow;  the  first 
one  much  lonfjer  than  the  second;  the  following  joints  black,  flat- 
tened; the  third  iSomewhat  broader  towards  the  end;  the  fourth 
much  enlarged,  of  a  nearly  triangular  form,  beset  upon  the  ui)per 
side  with  short,  close,  minute  black  hairs;  the  fourth  joint  is  like- 
wise much  enlarged,  still  not  as  broad  as  the  third,  and  of  a  more 
ovate  form.  Hind  tibise  much  thickened,  stoutest  in  the  middle, 
and  marked  upon  the  ujtjjcr  side  with  a  narrow  pale  line  running 
from  the  middle  to  the  tip;  hind  femora  ciliated  beneath  with  long 
black  hairs.  Lamella)  of  the  hypopygium  dingy  yellow,  with  a 
broad  black  border,  of  moderate  size  and  of  a  rather  round  shape, 
jagged  on  the  apical  margin  and  fringed  with  I)lack  bristles. 

jfemale.     Feet  jdain  ;  the  fore  tarsi  rather  blackish  already  from 


^'di 


DOLiciiorrs. 


37 


the  tip  of  tlic  first  joint,  which  is  si»iiictiiiu'.s  tho  case  in  ^ ,  l»ul 
only  in  vcrv  (iiirk-culitrcil  siicrinicns. 

Jlub.   Mi(Ulle  Slutt's.    (OnlLU-.Suri\(.'n.)     liiinitis.    (Konnifoit.) 

lO.  I>.  brevlpeiiniH  Mi;io.  %  and  $>. — Aonco-viridis,  nutfiuiiy, 
mnilorum  tcgulaiuiiKiiiu  ciliis  tiigiis,  coxiH  anticiH  prnetei-  liiisiiii  ptMli- 
t)usi|u*!  tliivis,  tiii'Mtti  tiliianim  ]M)sticai'iiia  a|iii'.'ili,  tiirsis  inttMini-ilii.i 
indf  all  ai'ticiili  {niiiii  aiiice,  ]io>ti(!isijiit;  totis  iiigris. 

^.  Tai'sis  aiitiuis  atteiiuati!«,  nrticulis  duoluis  iiltiiiiis  atris,  coniprMSsi*, 
ultiiiKi  ••\iiiii»'  (lilatato,  feiiioriliiis  ]i(isti(us  palliile-riliatis, 

9'  IV(libii8  »imtilicil>U:j,  tarsiH  aiitiii.s  indu  ab  articuli  ]iriiui  a{iicH  iiii;rifl. 

Metallic-gre»'n  ;  aiitenniP,  cilia  of  Uih  inffiior  orbit  and  of  tlin  tcgul.'e  Mack ; 

foiH  coxa?,  exit'pting  tlie  basin,  and  feet  ytdiow  ;  tbe  last  tiiird  of  tlit» 

hind  tibia',  the  iiiiddlu  tarsii  from  thu  tip  of  thu  lirst  Joint  and  the  wliolt) 

hind  tarsi  blac^k. 
%  .  Fore  tarsi  attenuated,  tho  two  Inst  joints  black,  llattened,  the  last  one 

extreinely  enlarged;  tlie  hin<l  femora  ciliateil  with  pale  liairs. 
5.    Feet  plain;  the  fore  tarsi  from  the  tip  of  tlie  first  joint  black.     Long, 

Corp.  0.24— 0.25.     Long.  al.  %  0.22;  9  0.24—0.25. 

Syn.  Dolirhopns pliiviilorsi'x  (var.  B.)  Fallkn,  Did.  10,4. 

IJollrfiiipiifi  hreriptnniis  MKroKN,  Syst.  Ueschr.  IV,  8!*,  27. — SxANNirs,  Isis, 
1831,  GO,  12. — ZiCTTKiisTKiiT,  Ins.  Lapjf,  700,  8. — SxAWfKU,  Krilyer 
Tidsskr.  IV,  2:?,  13.— ZKrrEUSTiiDT,  Dipt,  ticand.  II,  eo:5,— Wai.kkk, 
Dipt.  Urit.  I,  100,  10. 

l)jirk  mctullic  frnrti,  hrifrht.  Front  jriTon.  Antoiiine  l)hick. 
Face  of  till'  (^  frrnyisli-yt'llow ;  that  of  tho  9  frrayisii-whitc, 
slitrhtly  yollowisli,  nmcli  broaih'r  than  in  the  (^ .  J'alpi  brown. 
Cilia  of  the  inferior  orhit  bhick.  ]Iyiio]»yfri  in  black.  Lainclhe 
larire,  ol)lon.<r-ovate.  iliim-y-yellowisli,  witii  a  broad  black  border, 
on  llie  a])ical  nnirfrin  somewhat  Jajrjred  and  frinjred  with  crooked 
black  bristles.  Tlie  hind  coxie  lihickish,  only  (jn  the  e.xtrcnie  tip 
yellow.  Fore  coxai  yellow,  hairy  with  black;  on  the  outside  of 
the  basis  witli  a  somewhat  trian<rnhir  frreenish-bhick  sjiot.  Feet 
yellow,  Hind  femora  before  the  end  oidy  with  one  bristle;  in  tho 
J*  tliey  are  s))arsely  ciliated  beneath  with  very  lon^.  yellowish 
hairs.  On  the  liind  tibiie  the  hist  third  at  least  is  Itlack:  hin<l 
tibia;  of  the  J'  perceptibly  stron!>-cr  than  those  of  the  9,  but  not 
near  so  stronjjj  as  those  of  the  nnile  of  J>.  jni<-h;/<'iu'ntnx ;  they 
have  no  lar<re  bare  spot  upon  their  hind  side,  but  at  the  end  of 
the  upper  side  a  straijrht,  pale,  longitudinal  line  occupyinj^  the 
whole  of  their  last  third.     The  fore  tarsi  of  the  ^^  are  about  1^ 


•I 

.'it 


\\''     ■I:  ;■ 


M      i       ^ 


M 


88 


nil'TKIlA  op  NOHTir  AMKIUCA. 


[I'AKT  IT. 


'  1 


tlie  leiijftli  of  the  tiltiii';  tlnir  llin-c  lirst  juiiits  are  slylc-like, 
very  allciiimled,  t^eiienilly  lii«t\viii.<li-yelltj\v  ;  llieir  iwn  lii>l  joints 
an-  liliu'k,  lltilteiicti  IVoiii  the  side,  tlie  iii'iiultiiimlt;  l)iit  liltle,  the 
lust  Jiiiiit  on  the  coiilrary  vei'y  iiiiich  eiihirfred.  'I'lie  t'oiv  tai^i  of 
IIk;  9  lire  phiiii,  bhickish  IVolii  the  tip  of  th(!  lirst  joint.  Miildle 
tursi  of  liotli  sexes  pluin,  Maek  from  tiie  tip  of  tiie  first  joint  ;  upon 
llie  second  iiiilf  ttf  the  upper  side  id'  their  first  joint  a  single  stnuijicr 
l)rislie  is  inserted.  Hind  tarsi  always  aitoji-ftlHr  Idaek.  Cilia  of 
the  teu'iihe  Idaek.  AVinjrs  id'  the  J*  somewhat  le<s  grayish  than 
those  of  the  ?,  proportionally  somewhat  shorter  and  more  ptdiited, 
with  a  struiij^  .swellinij:  of  the  eosta  near  the  tip  of  the  lirst  loii^i- 
tmlinal  vein.  The  hind  transverse  vein  almost  perpendieular ; 
the  last  pnrlioM  of  the  fourth  loii<jiitudinal  vein  not  lirokni. 

JJdIi.    Fort  llesolution,  Hudson's  l»ay  Territory.     (Keiinieott.) 
Oltsi'rralion. — The  identity  of  Mr.  Keiiiueolt's  spceiniens  with 
tlic   European  7>.    Iircri/icniiia  may  ho  cuusidored   us  doubtless, 
after  the  must  careful  t'oiuparisun. 


'■•',11'  I 


'r- 


1>.    Cilia  of' I  he  iiifcriar  orbit  pale. 

A.    Cllhi  'if  till'  t(  i/iil:r  jin'f. 

1.  AnttMime  black,  at  tlm  utmost  tiio  liuucr  jmrtion  of  the  first  joint  rod. 

1  i.  1>.  lUllgilliailllM  I.oKW.  %  anil  f. — Avnco-viiiilis,  fai'io  maris 
palliile  Ofliraut'tl,  fconuiifo  e.v  Uavo  ciner/tsccntt',  aiitfnni.s  iiimis,  ciijis 
oculnruni  ititVriorilius  ti'unlarunniiiH  cilii.s  (lavit-atitiiius  coxaruni  aiiti- 
carum  lUmiilio  hasali  oliscuro,  jx-iiiiius  tlavis,  tarsis  ]p(isticis  totis  iiicris; 
maris  ultimo  tardorum  anticoriun  artieulo  vaUle  dilatato  IVmori basque 
posticis  ciliatis. 

Metallic  gn'i'n  ;  the  fare  of  tbo  %  pal"  ochrt'-yt'llowisli,  that  of  the  9  yel- 
l(i\visli-i.'i-ay  ;  aiitiMiiia'  black  ;  cilia  of  tlic  inlVrior  orbit  ajid  of  the  tepub-n 
yfllowish  ;  basal  half  of  the  fore  coxiu  ilaik  ;  feet  yellow  witli  entirely 
black  hiiiil  tarsi,  last  joints  of  the  %  fore  tarsi  enl,ir;,'eil  ami  ^  hiud 
femora  ciliateil.     Long.  eorp.  0.2(! — 0.27.     Long.  al.  0.27 — 0.28, 

SvN.  DolithoiniA  liini/imaniis  LoKW,  Neue  Heitr.  VIII,  14,  7. 

Uronze-ji'reen,  rather  bri^ilit.  Taee  of  the  ^  narrow,  pale 
oehre-yellow;  face  of  the  9  rather  hroad,  liii'ht  yellow-gTiiyish, 
Antenme  entirely  black,  lower  corner  of  the  third  joint  with  a 
scarcely  ])ereeptil)le  lifrhter  colorinii';  third  joint  of  the  antenna! 
in  the  ^  short  ovate,  in  the  9  almost  round.  Front  bria'ht, 
green    or   blue-green.     The   cilia    of  the    inferior   orbit   yellow. 


iHll.h    ||Ol>l'S. 


3'.> 


Vitpcr  siilc  i»r  till'  tlioi'iix  .sniiu'wliiii  |»riiiiiuso,  witli  a  ('(ipiK'n' 
iniililk*  stripi'  iiiid  whii  u  sonu'wliiit  ((iiiptry-nilorcd  murk  (Hi  each 
n'uU'  In'Inrc  till'  triiii>\fi's<'  Mitiiir,  suiuciiiiu'.s  cuppcry  on  a  lai^irr 
I'Xtfiil.  IJasiil  pDrtioii  (if  thu  Unv  cuxu'  lilarkisli  licynml  tlif  initl- 
illc;  on  tiK'  iiiidillc  ami  liiiid  ones  lliis  ciiloi-iii^'  cMtinIs  aliao.st  as 
far  as  1  lie  cM nine  tip.  Feet  ydlitw  ;  lore  tarsi  liinck  at  the  tip 
only,  initMIc  nm-s  I'nim  tlii<  tip  of  the  first  Jnini  ;  liiiHl  tarsi  ciilinly 
lilack;  till'  liiml  IV'imira  Im-Ioit  tlic  tip  with  a  hrisilc.  Tt-jrulu'  with 
yt'llnwisli  cilia.  Winers  ratlifi'  lar^c,  liyalim- ;  tlio  lourtli  Innji'i- 
tmlimil  vi'iii  not  l)rok<'ii. 

Male.  Till'  lamcllii'  of  the  liypopyuMiim  wliitisli.  on  the  Ul»p('r 
mai'u'iii  with  a  narrow,  on  the  apical  one  with  a  liroadcr  Itlack 
liordcr,  ovate ;  their  apical  marjiin  is  frinj^'cd  with  lilack  Itristles 
and  jaji'f^ed  on  its  lower  part.  Fore  larsi  slender  and  nearly  twice 
ns  lonj?  ns  the  tibite  ;  the  four  lirst  joints  yellow  ;  first  joint  as  lonu; 
as  foiir-lil'ths  of  the  tibiie;  second  j<iint  half  as  lonj;  as  the  first; 
the  third  one  bnt  little  shorter  than  tin  second;  the  fourth  only 
nl)oia  half  as  lonj;  as  the  third;  the  tilth  joint  but  little  loiipT 
than  the  fourth,  black,  flattened,  beset  upon  the  upper  imirjrin 
with  appressed  black  hairs.  JlimI  femora  upon  the  second  half 
of  the  under  side  closely  ciliated  with  yellow  hairs.  Jlind  tibiie 
somewhat  stout,  without,  bciii^^  actuiilly  thickened  ;  they  an; 
irlabrous  upon  the  anterior  Imlf  of  their  hind  side.  Costa  near 
the  tip  of  the  lirst  longitudinal  vein  with  an  elongated  swellin<;. 

JIdh.  F]n<iTish  river.  (Kennicott.)  West  Point,  N.  V.  (Us- 
leii-Saekeii.) 


k'Xi 


'l    >'■ 


Mf 


1"1.  D.  bl'«»vilimiHJS  LiiKW.  %. — Aeni'o-viii<lis,  fncin  .iltiil,  nnti'ima- 
luai  iiigrai'Uiu  articulo  priino  tsiilitus  luto,  (.'iliis  (iculonim  iiit'i'iiorilius 
all)is,  ti'gularuin  ciliis  pallida  tlavifaiitilnis,  iii'dilms  tlavis,  enxis  aiiticis 
coiicdloiilius,  tarsis  aiiticis  n.\  tlavo  jiallide  I'tTiiiijiiifis,  iiitiTuieiliis  inde 
alt  ailii'uii  in-iini  ajiice  j)ostii;is()Ue  totis  {•iiiu  tilii.imiii  n\tui'  iii^'iis. 

Mftallic-gifeii ;  face  \vliitn  ;  tlie  tlist  joint  of  tin-  Idaidi  antenna'  ujtoii  tlie 
uiidtT  side  r»'d  ;  cilia  of  tlie  iiitVrior  orliit  white,  of  tlie  tcuala?  yeljowisli ; 
tlie  fdiv  ci).\;c  ;niil  fV.'t  yellow  ;  tljc  fore  tai>i  i>;ile  rnsty-ln'owiiisli  ;  inid- 
dle  oiit's  from  tlie  tip  of  tlic  lirst  joint  and  tlu'  wliolt-  hin^  onfs,  including 
tlie  tip  of  liie  tilii.i',  lilack.      I.onL.'.  corp.  0.17.      l.oni,'.  al.  U.17. 

y-i-.v.   holichojiita  lin  ri  IIIU  litis  LoKW,  Neue  Hoitr.  VIII,  14,  8. 

Metallie-,trreeu,    brijjfht.      Face    white.     Anteniiie    black;    the 
whole  lower  nnirgin  of  the  lirst  joint  red ;  third  joint  ovate,  not 


T    f      ■ 


i 


n.  ti 


i'-r  iHI 


40 


DII'TKUA  OF  NOUTII  AMLllICA 


[part  Jl. 


rduiidc'd  at  the  tip.  Front  hrijrlit  l)luisli-}rrc('ii.  Ciliaof  tin*  in- 
ferior orl»il  white.  Laiiieilsi'  of  tlie  liypopyfiiiiiu  wliitc,  of  incdiiim 
sixe  and  of  oviite  form,  upon  tli*'  upper  and  a|iieal  nniruin  with  a 
narrow  blaciv  Itonh'i',  and  friiifred  wilii  I)lael<  l)risties;  on  the 
apical  marfrin  somewhat  jajrfi-ed.  Fore  ('oxa>  vellowisii-wliite,  with- 
out minute  hlacl<  Imivs  ni»on  tli"  anterior  side;  miiMIe  and  hind 
coxie  l)lael<isl»  witii  wliitisli-yelhiw  tip.  Feet  lifilit  yellow ;  hind 
femora  l)eset  with  somewhat  lonjrer  minule  l)laek  hairs,  without 
heinjr  actually  ciliated.  Hind  tihiie  ])\i\\u,  upon  the  hind  side 
without  glal»rous  stripe,  at  the  tip  hiaekish.  Fore  tarsi  only 
as  loiij?  as  the  tihise  and  hut  little  darker  than  those,  yellow- 
lirownish ;  middle  tarsi  hlack  from  the  ti|)  of  the  first  joint;  hind 
tarsi  entirely  bhiek.  're<;:uhe  with  pale  yellowish  cilia.  Wings 
hyaline,  towards  the  fore  marii'in  with  a  faint  l)rownish-<j:raY 
tiufj^e;  eosta  near  the  tip  of  the  first  loiijritudinal  vein  allhouu'h 
.somewhat  stouter,  not  actually  thickeneJ;  the  fourth  longitu- 
dinal vein  not  broken. 

Hab.  Washington.     (Osten-Saeken.) 


.:-M^^ 


m.i> 


■i) 


.  |! 


iiiiiiillljiii;. 


i;j.  D.  socilis  LoKW.  %. — A;'ni>o-v!  idis,  facMe  alba,  mitcnnnnnn  ni- 
granim  artii'iilo  i)iinio  siil  tus  lufo.  .  ,liis  ociiloruin  infcrioriliiis  alliis, 
teirularniu  ciliis  tliluti!  lla»-it"aiitilpus,  jifdilius  llavis,  coxis  aiiticis  con- 
coloril)Us,  tai'sis  antfrieiilnts  iiidn  al)  artiiaili  i)riiiii  a]>ice,  apice  tibiaruiu 
postioa.uiu  tarsis(iui!  post^'Ms  totis  iiigris. 

Metallic-grot'ii ;  fai'f  wliito  ;  the  livst  joint  of  tlio  Mack  niitcDn.T  njinn  tlie 
under  side  red  ;  eilia  of  tlie  inferior  oibit  white  ;  eiiia  of  the  tegulic  pain 
yellowisli  ;  fore  eoxiv  and  feet  yellow,  the  four  anterior  t.'irsi  from  tlie 
tip  of  the  lirst  joint,  ilie  tip  of  the  hind  til)i;e  and  the  whole  hind  tars-i 
lilaek.     Long.  corp.  (•.  17.     bong.  al.  tl.lT. 

Syn.   Doiirliopiis  suciiis  liOHiV,  BimI.  Miitoni.  Zelt>:ehr.  VI,  211,  tiO. 

Metallic-green,  bright.  Face  white.  Antenmo  l)lack ;  the 
whole  lower  margin  of  the  first  joint  red,  the  third  joint  ovate,  not 
rounded  at  the  tip.  Front  hrighf,  liluisli-green.  Cilia  of  tln^  in- 
ferior orltit  white.  Tjamelhe  of  the  hypopygium  white,  of  medium 
size,  ovale,  on  the  '.ipper  ami  apical  nnirgin  with  a  iiarrow  black 
liorder  and  fringed  with  black  I)risth>s,  on  the  sipical  margin 
somewhat  jagged.  P'ore  coxa^  yellowish-white,  without  minute 
black  hairs  upon  the  froi-.  side;  middle  ami  hind  co.xse  blackish, 
with  yellowish  tip.  Feet  pale  yellow;  himl  femora  ui)on  the  un- 
der side  with  but  extremely  short  liardly  visible  hairs;  hind  tibise 


DOLU'IIOI'US. 


41 


MiU'kish  at  the  tip;  \}\)(m  the  lii'ul  side  witliout  jrlahrons  sti'ipi", 
I'oro  tarsi  hut  littlo  h)n{f('r  than  tiu!  tihitu,  ratlicr  sloii(h'r,  hiackciicil 
from  tiu!  tip  of  tiie  first  joint,  still  so  that  tlio  extreme  hasis  of  tlio 
second  and  sometimes  even  tliat  of  the  third  joint  remain  pale ; 
the  last  joint  of  the  fore  tarsi  is  lijrht  rusty-hrownish  ;  middle  tarsi 
from  the  tip  of  the  llrst.  joint  hlaek ;  hind  tarsi  entirely  Itiaclv. 
Cilia  of  the  tefruhe  i)ale  yellowish.  Winjrs  hyaline,  towards  tlK3 
fore  inarji'in  with  a  faint  brownish-frray  tin<;e;  the  eosta  near  the 
tip  of  the  lirst  longitudinal  vein  only  very  little  stouter,  but  not 
thiekened;  fourth  loni^itudiiial  vein  not  broken. 

Hah.    lU-nois.      (Ii(;  lianii.) 

ObfierraliDn. — In  order  to  distinfruisli  D.  .^onus  from  the  very 
like  J).  I>rcvii)ia»u.'<,  it  is  only  neeessary  to  ])ay  attention  to  the 
dilferenee  in  the  length  and  coloring  of  the  fore  tarsi  and  also  to 
the  diflerent  nature  of  the  hairs  <mi  the  under  side  of  the  hind 
femora.  Krom  JJ.  xi(hfili(i( !(.•<,  nid'us  and  xphnidiilKx,  J).  .-^x/Ks 
dilfers  by  its  hind  tibisc,  which  arc  distinctly  blackish  at  tlu  tip, 
whereas  in  7>.  Hiibcili(iti(!<  and  »«a/».s  they  are  only  slightly  infus- 
eated  at  the  tii),  and  altogether  vellow  as  far  as  the  extreme  tip 


in 


D.  Kplcndidus.  From  J),  t^uhviliafus  and  />.  f<iilc)uh'(li(s  it 
further  dilfers  by  the  I'cd  coloring  of  the  lower  margin  of  the  first 
joint  of  the  antenin«  and  by  the  hind  femora  of  the  ^  which  are 
not  ciliated ;  from  all  three  al)ove  mimed  species  it  differs  by  the 
plain  fore  tarsi  of  the  J*. 

14.  D.  nudlis,  n.  sp.  %  and  9- — Viridis,  nitidn.i,  poxi's  anticis  pcdi- 
busqiie  rtiivis,  apice  tibianini  posticaruni  siibfiisfo,  antiMiiiis  pia'tcr  iii- 
fei'Uin  articuli  priini  inargiiu-iii  tarsiscjue  jjostici.s  iiigris,  ciliis  ouulorum 
inferioi'ilms  teLMilariiUKiiie  cnliis  llavicantibus. 

%.  Tarsis  anticis  elongatis  tunuiljus,  aiticulo  ultimo  dilatato  atio,  ftnuori- 
bus  posticis  lion  ciliatis. 

9.   P»Hlibus  siuiplicibus,  tarsis  anticis  in<l(«  ab  articuli  prinii  apice  niirris. 

Green,  bright ;  fore  coxne  and  feet  yellow  ;  tip  of  tlm  hind  tibia-  brownisli  ; 

hind   tarsi  lilack;  lower  margin  of  the  first  joint  of  the  black  anteiniie 

red  ;  cilia  of  the  inferior  orbit  and  of  the  teuiibe  yellowish. 
%,   Fore  tarsi   elongateil,  slemler,   their  eiihirged  last  joint   black;  hind 

femora  not  ciliated. 
9  .   Feet  plain  ;  fore  tarsi  from  tlie  tip  of  tlie  first  joint  blackened.     Long. 

Corp.  0.21—0.22.     Long.  al.  0.2.'). 

Male.  Metallic-green,  b.ight.  Front  nn'tallic-gre;-!).  An- 
tenna; black  ;  the  under  side  of  the  first  joint  yellowish-red  ,  third 


•f-.  > 


I 


1 


fU 


f!> 
■1'  < 


'J ' 


'1 


'    in 


r 


]''■■■  I   ii 


ti;- 

1:^ 

1        • 

IK''*' 

5| 

i 

«■. 

'  , 

W' ' 

r 

1: 

■-  1 

H 

y^ 


42 


DIPTEUA   OP  NOHTII  AMKRICA. 


[part  It 


I       '•ll'ti'.^ 


jniiit  rather  l)lui»t  at  the  tip.  race  odire-yolh)\v  ;  palpi  yellow, 
{'iliu  of  the  inferior  orhit  pale  yellowish.  IJypoiiygiiiiii  black; 
laiiieihe  of  medimii  .size,  ovate,  white,  with  a  rather  narrow  hlaek 
hordcr,  on  the  apical  niaru'in  Ja<iji,'e(l  and  friiifred  with  hlaek  bristles. 
F  Jiir  posterior  eoxiu  l)hickisli  with  yellow  tip.  Fore  coxa)  yellow, 
only  somewhat  blackened  at  the  extreme  basis,  l)eset  upon  the  an- 
terior side  with  delicate  ])iack  hairs,  which  reach  nearly  to  their 
l»ase  Feet  pale  yellow.  Hind  femora  before  the  tij»  with  a  bris- 
tle, npon  the  under  side  only  with  very  short  niinute  pale  hairs. 
Hind  til)iie  stout  but  not  exactly  thickened,  U})()n  the  lirst  half  of 
the  hind  side  without  hairs,  at  the  extreme  tip  brownish.  Fore 
tarsi  twice  as  long  as  the  til)ia! ;  their  four  first  joints  very  thin, 
yellow  ;  lirst  joint  nearly  as  loiiu:  as  the  three  following  oue.s 
together;  the  third  somewhat  shorter  than  the  second;  the  fourth 
hardly  half  as  long  as  the  third;  the  lifth  joint  black,  flattened, 
bi'oad,  still  not  as  large  as  in  J>.  haliUij'cv ;  \\\nm  its  upper  margin 
it  is  beset  with  appressed  minute  black  heirs,  ^liddle  tarsi  from 
the  tip  <tf  the  first  joint  blackened  ;  hind  tarsi  entirely  black.  Cilia 
of  the  teguhe  yellowish-white.  "Wings  hyaline  ;  near  the  tip  of  the 
lirst  longitudinal  vein  with  a  long  but  iiot  very  thick  swelling, 
which  gradually  merges  into  the  costa ;  fourth  longitudinal  vein 
not  broken. 

FvDKtlf.     AVings  and  feet   jtlain,  fore  tarsi  from  the  tip  of  the 
first  joint  l)lackeiie(l.     All  the  rest  as  in  the  male. 

Jhib.  Fort  Resolution,  ITiidson's  IJay  Territory.  (Kennioott.) 
Ohftfrra/ion. — The  resemljhuice  of  the  })resent  sjiecies  with  D. 
snhrih'(i/((s  is  so  great  that,  as  Itoth  occiir  in  the  same  region,  I 
was  for  a  long  time  in  doubt  wlu'ther  I  should  consider  them  as 
two  species.  As  the  unfringed  under  side  of  the  hind  femora  of 
my  two  J'  of  />.  mtdu'  does  not  seem  to  be  rubbed  off;  as,  in  both 
sexes,  the  lirst  joint  of  the  aiitennie  is  tinged  with  red  on  the  under 
side,  and  as  there  ar<'  soiiu'  other  dilferences  besides  (which  will  be 
seen  by  the  comparison  of  the  descrijitions  of  both  species),  I  am 
leil  to  the  conclusiou  that  there  is  a  specilie  diflerenee  Iietween  I). 
vinlii.-<  and  />.  suixu'lid/us.  It  is  very  striking  how  closely  allied 
the  species  of  some  groups  of  >'orth  American  Dolichopus  are. 


Im'^%' 

\    "■' 

M| 

\ 

Is- 

R^ 

f'-w'^i?W>'    ' 

\ 

:vM-4»;  '"n 

i!>>WT 

ikxefi''^^^ 

,  J 

■Hi^ 

" 

\ 

15.  n.  silbriliiltllH,  n.  sp.      %. — Viiidis,  iiitiiliis.  ooxis  anticis  jitnli- 
liusi]ue  llavis,  apico  tibiiirum  posticaruui  subfusco,  aiiteiiuis  tarsisciue 


DOLTCirOPUS. 


43 


pnsticis  nigris,  ciliis  oculoiuia  jiifeiioribus  tegularumque  ciliis  flavican- 
tibus. 
%  .  Tfirsift  aiiticis  eloiigatis  tenuihus,  articulo  altiiiio  diliitato  atro,  femo- 
rilius  posticis  rare  tiavo-ciliatis. 

9 

Green,  shining  ;  foro  coxje  and  feet  yellow  ;  tip  of  tlie  hind  tihi.T  lirowiiish  ; 

antennse  and  hind  tarsi  black  ;  cilia  of  the  inferior  orbit  and  of  the  tegulie 

yellowish. 
%  .   Fore  tarsi  elongated,  slender  ;  thn  enlarged  last  joint  black  ;  the  hiuJ 

femora  sparsely  ciliated  with  yellow. 
9 Long.  Corp.  0.21— 0.22.     Long.  al.  0.2'). 

M('tallii--jrrcon,  l)rit;lit.  Front  iiR'tallic-fii'ecii.  Anteniiii;  black; 
on  till'  uiidcr  sido  t»f  the  first  joint  I  am  not  ai)lc  to  discover  any 
li^'liter  colorinjj:;  third  joint  ratlior  hlunt  at  the  tijt.  Kiicc  g-rav- 
isli-yellow,  nearly  oclire-ycllow.  Palpi  yellow.  Cilia  of  tlio  in- 
I'urior orbit  palL'-yellowisli.  IIyi»oi)y<>;inni  black;  lanit.-lla'ornicdinnj 
size,  ovate,  wliitc,  with  narrow  black  border,  on  the  apical  niarji'iii 
somewhat  ja,aj>ed  and  frin<>'ed  witli  black  bristles.  The  tonr  poste- 
rior coxiL'  l)lackish  witii  yellow  tip.  Fore  coxie  yellow,  oidv  at 
the  extn'me  basis  somewhiit  blackened,  upon  the  anterior  sid(> 
beset  with  very  delicate  black  hairs,  wliicii  do  n((t  reach  to  their 
base.  Feet  pale  yellow.  Hind  femora  with  a  bristle  before  the 
tip,  u])on  the  jrreater  part  of  the  under  side  sparsely  ciliated  with 
moderately  lonji'  yellowish  hairs.  ]Iind  tibiiu  slont,  but  not 
exactly  thickened,  not  hairy  n[)on  the  liist  half  of  the  hind  side; 
)»rownisli  at  the  extreme  end.  Fore  tarsi  twice  as  loiio-  ns  the 
til)iie;  their  four  first  joints  very  slender,  yellow;  the  lirst  joint 
nearly  as  loiijr  as  the  three  followinj,'  ones  too^iher;  the  third 
somewhat  shorter  than  the  second;  the  fourth  hardly  half  as  lonj; 
its  the  third  ;  the  liftii  joint  black,  flattened,  broad,  still  not  ns  lai'fi'e 
as  in  J>.  hriliUifer  ;  upon  its  upper  edji'e  it  i  ■  beset  with  apjiressed 
minute  black  hairs,  ^liddle  tarsi  from  the  tip  of  the  lirst  joint 
Idackeiied.  Hind  tarsi  entirely  black.  Cilia  of  the  tefiula- yel- 
lowish-white. AVinjis  hyaline,  somewhat  li'rayish,  at  the  tip  of  the 
first  loufritudinal  vein  with  a  lonf>'  but  not  very  stout  swcllinir, 
which  fxradually  mer,ii-es  into  the  eosta ;  fourth  long'itudiiml  velu 
not  broken. 

Jlab.    Fort  iresi>lution,  lluilson's  Ibiy  Territory.      ( F\ennic<itt.) 
Obttn'rntion. — Tiio  necessary  data  for  the  distinction   of  this 
species  from  the  forogoiug,  is  contained  iu  the  description  of  Iho 
latter. 


■,  ,■'■<-,• 


I,',::  .■■(: 


>!■?:*{ 


.m 


:-4 


t':i'- 


i  n 


'?W 


44 


DIPTERA  OF  NORTH  AMERICA. 


[part  IX. 


16.  D.  Hplendidlis  Loew.  %  . — Aeneo-viridis,  liptissime  oupreo  mi- 
cans,  pedibiis  Uavis,  coxis  anticis  tiliiisiiim  jiosticis  totis  conuoloribiiH, 
antennis  tarsis(jue  posticia  nigris,  ciliis  oculorum  iiifuiiuribud  teii^ula* 
ruinqiie  ciliis  tiavicantiliiis. 

%  .  Tarsis  anticis  iiiodict!  elongatis.  articulo  ultimo  dilatato  atro,  femoribua 
posticis  confeitira  flavido-cilia^is. 

9 

Metallic-green,  with  a  brilliant  coppery-red  reflection  ;  feet  and  fore  coxae 
yellow,  bind  tibise  not  darker  at  the  tip;  anteniue  and  hind  tarsi  black; 
cilia  of  the  inferior  orbit  and  of  tlie  tefuhe  yellowish. 

%.  Fore  tarsi  but  moderately  elongated  ;  the  enlarged  last  joint  black; 
liind  femora  closely  ciliated  with  yellowish. 

5 Long.  corp.  0.24.     Long.  al.  0.23— 0.24. 

Syn.  Dolichopns  splctiilidns  Loew,  Neue  Beitr.  VIII,  14,  9. 

Bronze-frrecn,  with  a  brilliant  eoppcrv-rod  reflootion,  very 
bright.  Face  pale-yollowish.  Anteiiiue  entirely  blaek  ;  the  third 
joint  short-ovate.  Front  hrifxht  jrreen  with  a  eoppery-red  reflect 
tion.  Cilia  of  the  inferior  orbit  ])ale  yellowisli.  Ui»per  side  of 
the  thorax  with  an  almost  i)nrplish  spot  on  eaeh  side  l)efore  the 
transverse  suture.  liamellie  of  the  hypo|)yfriuin  dinjry  whitish, 
rather  larji ;  and  of  an  oval  form,  on  the  ui)i>er  and  apieal  niarfriu 
narrowly  lio'dered  with  blaek,  on  the  latter  ja<r,<iTd  and  friiijrcd 
with  blaek  bristles.  The  four  posterior  eoxaj  blackish,  yellow  only 
at  the  extreme  tip.  Fore  eox«  entirely  yellow,  beset  U)ion  their 
anterior  side  with  ratlier  minute  black  hairs,  which  do  not  reach 
to  their  base.  Feet  yellow.  Hind  femora  before  the  tip  with  a 
bristle  and  upon  the  greater  part  of  their  under  side  closely 
eiliated  with  very  long  yellowish  hairs.  Hind  tibite  although 
stout,  but  not  exactly  thickened,  without  liairs  upon  the  anterior 
half  of  the  hind  side.  Fore  tarsi  not  cpiite  1^  times  the  length  of 
the  tibia) ;  the  four  first  joints  yellow  ;  the  first  to  the  third  stalk  like, 
still  not  (piite  as  slender  as  in  the  previous  and  in  the  three  fol- 
lowing species ;  the  fourth  joint  somev.hat  liroader,  i)articularly 
towards  its  tip  ;  the  first  joint  nearly  as  long  as  the  three  following 
taken  together,  the  third  somewhat  shorter  than  the  second  and 
the  fourth  distinctly  shorter  than  the  third  ;  the  fifth  joint  black,  f^ot- 
tened,  broad,  particularly  towards  its  tip,  still  by  far  not  as  large  as 
in  I),  hnlillifer;  upon  its  ui)per  margin  it  is  beset  with  ai)j)ressed 
minute  black  hairs.  Middle  tarsi  blackened  from  the  tij)  of  the 
first  joint ;  hind  tarsi  entirely  l)lack.  Cilia  of  the  tegulaj  whitish. 
Wings  hyaline,  a  little  grayish,  of  a  rather  equal  breadth;  th* 


i 


■f- 


Doijciiopua 


45 


costa  near  the  tip  of  tlie  lirst  longitudinal  vein  with  an  elongated 
but  not  very  stout  swelling ;  the  fourth  longitudinal  vein  not 
broken. 

Bab.  Illinois.  White  Mountains,  N.  II.  (Osten-Saeken.) 
Obaervulioa  1. — I  believe  I  J)()^^sess  also  the  9  of  this  species 
in  a  single  specimen,  and  would  not  doul)t  it  at  all  if  the  tip  of 
the  hind  tibia;  did  lutt  show  a  rather  distinct  brown  coloring, 
which  is  not  perceptible  in  the  J*.  All  the  other  marks  in  the 
9  are  precisely  as  they  might  l)e  expected  in  the  9  of  the  above 
described  J*.  The  fore  tarsi  are  blackened  from  the  tij)  of  the 
first  joint. 

(Hm'rvotion  2. — D.  itplendUhia  differs  from  7>.  sitbciliatus  not 
only  by  being  much  brighter,  but  i)articidarly  by  the  much  less 
perceptible  lengthening  of  the  fore  tarsi  and  by  the  much  longer 
and  much  closer  ciliation  of  the  hind  femora  of  the  male. 


'III 


'-■•• ' . 


MM 


■fWK 

mm 


IT.  D.  batillifer  LoRW.  %  and  9- — Aeneo-viridis,  pedibus  flavis, 
coxis  aiiticig  tibiij-tjue  posticis  totis  concoloribus,  antennis  tarsisque 
posticis  nigi'is,  honiin  basi  tlava,  ciliis  oculoruin  iiifeiioribus  teirnla- 
riuuque  ciliis  flaviuaiitibus,  maris  ultiuto  tarsoruiu  antiuorum  articulo 
adiuoduni  ililatato. 

Metallic-green  ;  fore  coxae  and  feet  yellow  ;  the  tip  of  tbe  hind  tibiie  not 
darker ;  antennse  and  hind  tarsi  black,  the  latter  at  tluj  base  yellow  ; 
cilia  of  the  inferior  orbit  and  of  the  tegulfc  yellowish  ;  the  last  joint  of 
the  fore  tarsi  of  the  %  remarkably  enlarged.  Long.  corp.  0.-(J.  Long. 
al.  0.J5. 

Syn.   Dolichopus  latillifer  Loew,  Neue  Beitr.  VIII,  If,     \ 

Metallic-green,  bright.  Face  of  the  ^  narrow,  more  light 
ochre-yellowish  than  golden-yellow  ;  the  face  of  the  9  broader  and 
yellowish-white.  Antenme  quite  black,  the  lower  corner  of  the 
first  joint  only  some\\ hat  lighter ;  ihe  third  joint  short.  Front 
green,  or  bluish-green,  bright.  Cilia  of  the  inferior  orbit  yellow- 
ish. The  more  bronze-colored  middle  line  of  the  thorax  often 
hardly  percei)tible ;  on  each  side  before  the  transverse  suture  a 
bronze-colored  spot.  Fore  coxse  yellow,  upon  the  whole  anterior 
side  with  a  black  ))ubescence.  Hind  coxie  only  at  the  extreme  tij) 
yellow.  Hind  femora  with  a  bristle  before  the  tijt.  Fore  tarsi 
black  only  at  the  tip.  Middle  tarsi  blackened  from  the  tip  of  the 
first  joint,  still  the  base  of  the  lirst  and  of  the  second  joints  is  often 
not  quite  black.     The  hind  tarsi  are  of  the  same  color.     Cilia  of 


'Ua 


1. 


I.  ) 


■!    i: 


,    ■!. 


"PP 


I'^'i.: 


46 


DIPTEllA  OF  NORTH  AMKKICA. 


[part  11 


the  tcfrnlto  yollowi^li.     Wings  grayi.sli-liyaliiie ;  tlio  fourth  luugN 
tudiiial  vein  not  broken. 

jMalc.  liiniielhe  of  ihehypopyfrium  whitish,  (jf  moderate  size  and 
of  a  ratlicr  oviil  sliape ;  on  tlie  n|)i»er  and  apieal  nuirgin  tliey  aro 
narrowly  hor(h'red  witli  l)hiek ;  on  the  hitter  very  niucli  jan'tifd 
and  frihtrcd  witli  black  lu'lstles.  Jlind  femora  very  ('h)sely  ciliated 
with  yellow  Iniirs  on  the  middle  of  the  under  side.  Fore  tarsi 
al>out  l}j  limes  the  length  of  the  tibise  ;  their  three  first  joint >  slender 
and  stalk-like,  the  first  as  long  as  the  second  and  third  taken 
together  ;  the  second  about  !{;  times  the  length  of  the  third  ;  tin) 
fourth  joint  somewhat  more  than  half  as  long  as  the  third  and 
somewhat  broader;  upon  the  whole  under  side  and  u"  the  upper 
side,  excepting  the  tip,  whitish  ;  the  lifth  joint  somewhat  longer 
than  the  third  and  fourth  taken  together,  flattened,  extrenu'ly 
broad,  black  with  a  silk-like  reflection  ;  U])'>n  its  outside  this  reflec- 
tion takes  a  handsome  silvery  hue  when  viewed  in  a  very  oR- 
li(pie  direction.  Hind  tibiie  considerably  thickened,  the  greatest 
thickness  somewhat  before  the  midd'o  ;  the  anterior  half  of  their 
hind  side  without  i)ubescence.  The  costa  near  the  tip  of  the  first 
lonsj-itudiual  vein  with  a  rather  elonti'ated  swelling. 


JIab.    West  Point,   X.  V. ;   Illinois.     (Osten-Sacken.)      C 


on- 


nccticut.  (Norton.)    White  Mountains,  N.  H.    (Oston-8aeken.) 


Ifu: 


IS.  D.  eiKlactylus  LoKW.  %  ami  9- — Aeneo-viridis,  pedibus  tlavis, 
coxis  anticMS  til)iis<|ue  pc-^ticis  totis  coiicoloribufi,  niiteiiiiis  tarsiscjim 
postifis  iiicris,  lioruni  hasi  tlava,  ciliis  oculoiuiii  inferiorilius  tcirula- 
niiJHiue  ciliis  Havicantilms,  tnaris  duohtis  ultimis  tarsoruiu  anticorum 
articulis  dilatatis  et  feiiioribu.s  po^iticid  ciliatis. 

Metalli(^-creen  ;  fore  cox se  and  t'oet  yellow;  hind  tilii.T  not  darker  at  tlm 
tip;  the  black  liind  tarsi  with  yellow  root;  cilia  of  the  interior  oibit 
and  of  the  teaul*  yellowisli;  the  two  last  joints  of  the  fore  tarsi  of  tlirt 
%  enlarged  and  the  hind  femora  ciliated.  Long.  corp.  0.2ij.  Long. 
al.  0.■2^^. 

Sy.\.  Dolirhopus  eudnctylns  LoKW,  Meue  Reitr.  VIII,  16,  11. 

Metallic-green,  bright.  Face  of  the  J*  narrow,  ochre-yellow- 
ish ;  the  face  of  the  9  broader  and  yellowish-white.  Antenna; 
entirely  black,  the  lower  corner  of  the  first  joint  hardly  somewhat 
lighter;  third  joint  short.  Front  green,  or  bluish-green,  bright, 
(^ilia  of  the  inferior  orbit  yellowish.  The  more  bronze-colored 
middle  line  of  t''e  thorax  usually  but  little  distinct ;  on  each  side 


iflfl 


DOLiciropirs. 


47 


before  the  Kiiture  a  br  tizc-cdlored  sjxit.  Fore  cox.t  ycllnw,  npun 
the  aiiteriur  side  witli  Ijlaek  imltescciice.  Tlie  lour  posterior  cu.xie 
yellow  only  at  the  extreme  tip.  Feet  yellow  ;  hind  t'cniora  w  ith  ti 
bristle  before  the  tij).  The  color  of  the  fore  tarsi  ehaiijics  frnm 
brown  into  black  towards  the  ti|);  middle  tarsi  l)!a<kciicd  from 
the  tip  of  the  lirst  Joint  ;  the  hind  tarsi  are  of  the  same  color. 
Cilia  of  the  teirnhe  yellowisli.  AVings  g-rayish-hyaline,  the  lonrth 
luiigitiidinal  vein  not  Itroken. 

Mali:.  The  lameliii)  of  the  hypopyjjfium  whitish,  of  medium  size 
and  of  an  eloii<;ated,  ovate  shai»e,  on  the  njjper  and  a|)ical  marjiiii 
narrowly  bordered  with  black,  on  the  latter  much  jaji-fi-cd  and  Iriiiucd 
with  partly  black,  partly  yellowish  bristles.  Hind  femora  upon 
the  under  side  s|iarsely  ciliated  with  very  loiij;  yellowish  hairs. 
Hind  tibite  althon<ih  somewhat  .stout,  but  not  thickened  ;  the  two- 
thirds  of  their  hind  side  from  the  base  are  without  hairs.  Foro 
tarsi  over  1  ^-  times  the  lenjith  of  the  til)ite  ;  their  three  lirst  joints 
slender,  stalk-like;  the  second  Joint  measures  nearly  three-fourths 
of  the  lenjrth  of  the  first,  and  the  third  more  than  three-fonrths  of 
the  lentrth  of  the  second  ;  the  fourth  Joint  is  almost  as  lont;-  as  tho 
third,  flattened  .somewhat  broader  at  the  end,  still  even  here  not 
lialf  as  broad  as  it  is  loufr,  white,  with  a  handsome  silvery  rellec- 
tioii ;  tipon  its  upper  mar<.(in  witn  hardly  visilde  short  minute 
black  hairs;  the  fifth  joint  is  hardly  shorter  than  the  fourth,  flat- 
tened, and  somewhat  br(»ader  than  the  previous  one,  black,  beset 
upon  the  upper  nmr{>;in  with  short  api)ressed  minute  black  hair.s. 
The  costa  near  the  tip  of  the  first  htnjritudinal  vein  with  a  not 
very  considerable  l)ut  quite  di  tinct  swelliiifr ;  the  nniririn  of  the 
wiiifr  iietween  the  apex  and  tlu  tij)  of  the  fifth  lonu'itudinal  vein  is 
less  rounded  than  usua',,  so  i  uit  there  is  a  trace  of  a  shallow 
sinus. 

Hah.  New  York.     (O.iten-Sacken.)     Mass.   (Sanborn.) 


.:» 


W: 


■  ■■im- 


fir- 


::Mm 


)•■  ■•''. 


\y-' 


1!>.  D.  tonsMS  LoEw.  %  and  9- — Aeneo-viridis,  pedibns  flavis,  mxis 
anticis  tiliiisiiun  postiuis  fotis  concolorilms.  antennis  tarsis(nie  postiuis 
iii^ris,  Imruni  basi  llava,  ciliiH  oculonun  iiitVriorilxis  teu'iilariuiKine  ciliis 
rtavicantibns,  maris  duobus  ultiinis  taisonnu  anticoium  aiticulis  dila- 
tatis  et  femoiibus  posticis  non  ciliati.s. 

Metallic-green:  fore  coxne  and  feet  yellow,  tlie  liind  tit)ia^  not  darker  nt 
tlie  tip  ;  antennae  and  liind  tarsi  blaclc,  tbe  latter  at  tlie  basis  yclldw  ; 
cilia  of  the  inferior  orbit  and  of  the  tegulae  yellowislj ;  in  the  %  the  two 


. 1i"  ■: 


m^ 


48 


DIPTEUA  OF  NUllTlI  AMKllICA. 


[I'AKT  II. 


■  'its 


i  !iii,:.    r 


.:|:'^" 


last  Joints  of  tlie  fore  tnrsi  t-ulargeil,  uud  the  liitul  ft-inora  uot  ciliututi. 
Loug.  curp.  0.20.     Long.  iil.  0.25. 

Sv.N.   Dulicliupus  tunsiis  Loew,  Neue  lieitr.  VIII,  16,  12. 

Mftallic-gToeii,  bright.  Face  of  the  J*  narrow,  iiioro  light, 
oclire-yt'llowish  than  guKlon-ye'lhnv  ;  the  fuoeof  the  9  hruaUcr  and 
yellowihh-white.  Anteniue  entirely  hhick,  the  lower  corner  of  the 
lirst  joint  only  lighter;  the  third  joint  short.  Front  green,  *)r 
liluish-green,  bright.  Cilia  of  the  inferior  orbit  yellowish.  A 
bronze-colored  middle  line  of  the  thoiax  is  not  distinct  ;  on  each 
side  before  the  transverse  snture  a  bronze-colored  sjtot.  Fore 
C0XU3  yellow,  upon  the  anterior  side  with  rather  delicate  minute 
black  hairs,  which  gradually  disappear  towards  their  base.  Jlind 
toxie  only  at  the  extreni  >  tij*  yellow.  Feet  yellowy  hind  femora 
with  a  bristle  before  the  tip.  The  coloring  of  the  fore  tarsi  in  the 
J  gradually  changes  towards  the  tip  into  brown  antl  black  ;  nud- 
dlo  and  hind  tarsi  black  fntm  the  tip  of  the  first  j<(int,  still  the 
base  of  the  second  joint  yellow.  Cilia  of  the  teguhe  yellowish. 
Wings  grayish-hyaline ;  the  ftturth  longitudinal  vein  !n)t  broken. 

Jlalc.  Lamella)  of  the  hypopygium  v,hitish,  of  medium  size  and 
of  an  elongated  ovate  fin'ni,  on  the  upper  and  apical  margin  nar- 
rowly bordered  with  black,  on  the  latter  much  jagged  and  fringed 
with  partly  black,  i)artly  yellowish  l)ristles.  Hind  femora  not 
ciliated  upon  the  under  side.  Hind  tibise  of  ordinary  stoutness; 
their  whole  hind  side  uniformly  beset  with  minute  black  hairs. 
The  fore  tarsi  more  than  H  times  the  length  of  the  tibia; ;  the  three 
first  joints  slender,  stalk-like  ;  the  second  joint  is  o(pml  to  about 
two-thirds  of  the  length  of  the  first,  and  the  third  to  about  three- 
fourths  of  the  length  of  the  second ;  the  fourth  joint  is  nearly  as 
long  as  the  third,  flattened,  at  the  end  somewhat  broader,  still 
even  here  not  half  so  broad  as  long,  white,  with  a  handsome  sil- 
very reflection  ;  ui)on  its  up))er  margin  with  hardly  visible  and 
short  minute  black  hairs  ;  the  fifth  joint  as  long  as  the  fourth,  flat- 
tened, and  somewhat  broader  than  the  previous  one,  Itlack,  l)eset 
upon  its  upper  nnirgin  with  short  and  appressed  nunute  black 
hairs.  Costa  near  the  tip  of  the  first  longitudinal  vein  without 
swelling ;  between  the  apex  of  the  wing  and  the  tip  of  the  fifth 
longitudinal  vein  the  margin  shows  a  shallow  sinus. 

Ilab.  Washington.      (Osten-Sacken.) 

Obsercafion. — The  9  of  the  three  species  described  above  are 


i\^'m 


DOI.K'IIOIT.S. 


49 


very  cn^y  to  rotifound.  Tlio  clianictors  l»y  whicli  tlicy  cnn  Itc  dis- 
tinjriiislicd  arc  as  fnllows  :  1.  fur  />.  Uiitillifvr  ?  :  ']l\w  costu  iiciir 
the  tip  of  till'  lirst  loiifi'itiKliiial  vein  witli  ii  slit;lit  trace  nf  a  swcll- 
iiiu",  |»i'r('('i)til)li'  (inly  to  a  very  attfiitivc  uhstTvcr ;  tliis  swclliiij^'  is 
ratlicr  cloiiu'atcd  ;  tliu  ajicx  of  tin;  wiiifjf  soiia'wlial  Iiroadcr  than  in 
tlio  9  nf  the  two  otluT  species;  tlie  Ion;  coxa;  Itcsct  with  ratlier 
coarse  minute  l)hicl<  liairs  reachinfx  almost  to  the  base.  '1.  for  I). 
ciidiiffi/lttti  9  :  'I'lio  costii  nc.ir  the  tip  of  the  lirst:  lonjritudinal 
vein  with  a  sliu'ht  'r-iceot'a  swelIin'^  which  has  only  a  vcrv  trilling 
extent  in  lenji'lh;  the  apex  of  the  winjr  sonu'what  narrower  tiiait 
in  j'K  bdliUifrr,  Itut  i'loniewhat  ItroaiU'r  than  in  J>.  Iij)ixiix ;  tho 
fore  coX'.e  covered  with  rather  coarse  minute  Mack  Iniirs  reachinif 
till  very  near  ilu;  l>ase.  .'}.  for  />.  totisit.s  9  :  The  costu  near  the 
tip  of  the  lirst  lonu-itudinal  vein  witliout  any  trace  of  a  swellinj;  ; 
tlio  tip  of  the  winjr  somewluit  narrower  than  in  the  two  other  spe- 
cies ;  tho  bhick  i)ubescence  of  the  fore  coxa;  more  delicate  and  not 
reachinji;  as  far  towards  tho  base  as  in  tho  two  latter  species. 
AVhether  the  slidit  dill'erences  in  tho  coloriiifj^  (tf  tho  tarsi,  percepti- 
ble in  tho  specimens  (tf  these  sjiecies  c(»mpared  by  me,  are  sullicient 
for  their  sure  distinction,  can  only  bo  decided  by  tho  oxamluatiuii 
of  u  larjjor  number  of  specimens. 

2.  Antenna?  altogiftlier  or  for  the  most  part  yellowish-red. 

20.  I),  teller  Lokw.  %  . — Viridis,  facie  ex  llavo  albidil,  antennis  .-ufi;», 
ociiloruni  ciliis  inferiorilms  tcgularumque  ciliis  albiilis,  iiciHIms  paliiile 
flavis,  ultimo  tarsorunianticorum  articulo  maris  niodice  dilatato,  nigra. 

Green;  face  yellowish-white  ;  antennic  red  ;  cilia  of  the  inferior  orbit  and 
of  the  tegnlfe  whitish  ;  feet  pale  yellow  ;  tho  enlarged  last  joint  of  the 
fore  tarsi  of  tho  male  black.     Long.  corp.  O.ir;.     Long.  al.  0.17. 

Syn.  Dollchopus  teller  Loew,  Neue  Beitr.  VIII,  17,  13. 

Green,  brijrht.  Face  yellowis.i-whi'.';.  i\ntenntc  yollowisli-rod, 
the  apical  inarji'in  of  tho  third  joint  Ijlacicenti  ;  arista  with  a  very 
short  but  still  perccptiblo  pubosconce.  Front  metallic-frroeii, 
In'itiht.  Cilia  of  the  inferior  orbit  whitish.  Fppor  side  of  the 
thorax  not  very  bright.  liamolUe  of  tho  hy])opyj>:ium  white, 
rounded,  sliirhtly  bordered  with  black,  on  the  apical  imirfrin  some- 
what ja!ir<red  and  frinjred  with  black  bristles.  Coxtc  whitish-yellow, 
the  middle  ones  upon  the  outside  partly  jrray  ;  the  fore  ones  have, 
besides  the  black  bristles  near  their  tip,  only  a  very  short  and  deli- 


* 


■:■  (':' 


U' 


•■  .'.Mi 


\^  :r 


■'    '^::;'l■' 


\:a^ 


t . 


60 


DII'TKUA  OF  NOIITII  AMEllIC'A. 


A 


'11  !l 


[part  II. 


'  i 


ctitc  white  i)ul)('S('onco.  Feet  whit isli-yellow  ;  hind  fcniora  Ix-foro 
tilt'  tip  with  a  l)i'istk',  and  npon  tiio  second  half  of  their  nnder  .side 
I'iliiited  witii  six  to  seven  very  hinj?  yeilowish-wliite  hairs.  Fore 
til)ia!  Ion<;  and  slen(h'r  ;  hind  tiltiiu  rather  stout,  ImU  not  thickened, 
only  lit  tlie  huso  of  tiie  liind  side  somewhat  glaltrous.  Fore  tarsi 
fdil'orin,  over  l.^  limes  tiie  ienjjth  of  the  tihiat ;  the  four  first 
joints  pah'-yellowish,  their  relative  leiifrth  about  as  T) :  4:  .'5:  1,^; 
their  lifth  joint  i>ut  little  shorter  than  the  fourth,  somewhat  flat- 
tened, Mack,  beset  upon  its  upi)er  side  with  rather  ajipressed  I)la('k 
hairs.  .Middle  and  hind  tarsi  from  the  tip  of  the  first  joint  brown- 
ish. Cilia  of  the  tefruhe  yellowish-white.  Wiiiji's  hyaline,  rather 
narrow;  the  costa  near  the  tip  of  the  first  loiipjitudinnl  vein  with  a 
distinct  swellinj::;  tin;  third  lon<ritudinal  vein  not  broken  ;  the  hind 
transverse;  vein  ]»erpendicular  and  st"<iight, 
JJub.  Chicago.     (Osten-Saelven.) 

21.  D.  variabilis  LoKW.  %  and  9. — Laete  virirlis,  facie  mnris  pal- 
lido  aurea,  jhoik!  os  all'idii,  facie  lu'iniiifc  toti\  allm,  antennis  rufis,  ocu- 
lorum  ciliis  iiifcrioribus  albidis,  tegularum  ciliis  llavicantibus,  pedibu.s 
flavis,  alis  ciiiereo-hyalinis. 

Ilandsoino  green  ;  tho  face  of  the  %  pale  polden-yellow,  whitish  l)elow  ; 
the  face  of  tli(»  J  white  ;  antenna!  red  :  cilia  of  the  inferior  orbit  whitish, 
cilia  of  the  tepuL-e  yellowish  ;  feet  yellow  ;  wings  grayish-hyaline.  Long. 
Corp.  0.1!).     Long.  al.  0.1!). 

Syx.  Dolichopus  vnrtublUs  Loew,  Neue  Peitr.  VIII,  17,  14. 

nandsome  green,  bright.  Face  of  the  J*  more  pale  gold-colored 
than  (jchre-yellowish,  near  the  oral  liorder  whitish  ;  face  of  the  9 
proportionally  narrow,  white.  Anteniue  yellowish-red  ;  their  third 
joint  short,  f»vate,  generally  red  oidy  at  the  base  and  on  the  under 
side,  (dherwise  l)rownish-l)hu'k,  sometimes  brown  oidy  at  the  tip  or 
entirely  reddish-yellow.  Front  l>right  green.  Fore  coxjc  yellow- 
ish-white, beset,  besides  the  black  bristles  near  their  tip,  with  very 
(ielicate  minute  whitish  liairs.  ^liddlc  and  hind  coxa?  of  the  same 
color,  but  colored  with  black  u]ion  the  greater  part  of  the  outside. 
Feet  yellowish  ;  hind  femora  before  the  tip  with  a  bristle,  in  the 
J*  ciliated  upon  the  under  side  with  very  long  pale-yellowish 
hairs.  Fore  tarsi  of  the  ^^  about  1^  times  the  length  of  the  tibitc  ; 
those  of  the  9  hardly  as  long  as  the  tibitc,  blackened  from  the  tip 
of  the  first  joint,  i)laiii  also  in  the  J*.  Middle  tarsi  of  the  same 
color  as  the  fore  tarsi.     Hind  tibia;  also  in  the  J*  not  stout,  l)ut 


,  ■■'•\, 


rm 


pmjriroT'l's. 


il 


liltoii  tlicir  basal  half  nii  tlic  inside  <:-]a1tr(ms.  Hind  tnrsi  usually 
«[uito  black;  SdMit'tiincs  tjicii'  \\v<\  Juint,  with  tin-  ('.Nccptiun  (if  the 
tip,  i.s  (inly  hniwnisli  or  even  yrlldwisli  ;   uku'i'  Sfldnni  the  liasi.>  <if 


Uifir 


si'<'(iu(l  jdint  liiis  also  tlic  same  li^ilitcr  colonnji'.     (,'ilia  of  1  lie 


tc'Tulio  vcll'iwisli. 


Wii 


i'j:s  yravisli  livalinc.  of  rather  a 


ual  lir 


ead 


the  eosta  luis  in  the  J*  near  the  lip  of  the  lirst  louj;'itu(linal  vein  a 


^ll 


H'lit  swelliny: ;  the  fourth  louiritudinal  vein  is  not  liroken 


some- 


times the  apical  j)ortiou  of  the  anterior  part  of  tin;  w.nji's  show 


s  a 


<iinu'\vliat  stronger  u'ravi 


-h  t 


nitre, 


JIdb.   New  York.      (Osten-Saeken.) 


0/> 


IM- 


t'val 


Kill. 


■I).  I 


(iridhiliA 


is  more  variable  in  tin*  colorinir  of 


the  ])ostei'ior  tarsi  than  is  usually  the  ci 


se  \vi 


Ih  tl 


le  siieeies  o 


111! 


genus  l>iiJirli(qnif(.  \  have  received  a  female  as  lieloiiu'iiiLr  to  the 
\ariety  of  I),  varidhilix,  havinjr  li.u'ht  feet,  which  has  the  tei;ulio 
ciliated  with  bhu'k,  and  dillVrs  besides  from  the  other  females  un- 
doubtedly beloii^'ing  to  />.  varialiiliK,  by  tlu!  iiion;  clayisli-yellow 
color  of  its  win.^s.  I  cannot  take  it  for  the  9  tif  tiic  present  spe- 
cies. In  the  colorinjr  of  the  wiiiu's  and  in  several  other  characters  it 
apiiroaches  very  much  I>.  Itilripeinii.-^,  but  as  its  hind  tibia'  are 
without  b,  ;ts,  it  may  pcrhajis  not  even  IicIoult  to  this  specie 


I 


jiossess  also  some  other  females  which  I  can  only  distinii'iiisli  from 
the  above  described  9  of  7>.  rdrinbili.-^  liy  their  black  ciliated  teunhe. 
It  seems  therefore  that  either  the  females  vary  in  the  coloriim'  of 
the  cilia,  or  that  wo  have  here  two  exceedinji'ly  similar  species. 


.)  H 


»»ri. 


■   I 

■J  f'' 

'~  '-i. 

■  r 

■  i 

m 


i 


If 


M 


*Z'i.  D.  liitt'ipeniiis  T. 


oi;\v. 


%  . — Laete  viridi;?,  fi 


U'le 


alliidf 


niitoniiift 


I  nil- 


ocaloi'uui  ciliis  iiiferioriburt  albidis,  tt-gulaniiii  ciliis  llavicaiit 


ihii.-;, 


IH'ilibiiH  Ihivis,  tarsis  maris  simplicibus,  alis  lutescentilius. 


llanilsduie  green;  face  whitisli ;  aiitoniiju  reil  ;  cilia  (if  tbo  inferior  orbit 
wliitish  ;  cilia  of  the  tcgubo  yellcw  ish  ;  feet  yellow  ;  the  fort^  tarsi  of  (he 
%  plain  ;  wings  yellowish.     Long.  corp.  0.10.     Long.  ;l1.  O.l!). 


,N,   J)(ilirli()jius  lutcijicniiis  LoEW,  Neiie  Beitr.  VIII,  IS,  l.' 


iraiidsome  green,  moderately  liright.     The 


CO|( 


ir  of  the  face 


whitish,  only  upon  its  iqijier  jiart  somewhat  more  yellowish.  Aii- 
teuiuc  yellowi>h-red ;  their  third  Joint  short-ovate,  perceplilily  iii- 
fuseated  at  the  tip.  Front  bright,  green-blue.  Cilia  of  the  in- 
ferior orl)it  whitish.  I'pper  side  of  the  tlionix  dusted,  and  henctj 
somewhat  dull,  with  a  rather  distinct  brassy-yellow  niiddli;  line. 
The  pidiesceuce  of  the  abdomen  is  whitish,  not  only  oii  the  lateral 


ii'?ii 


52 


liII'TEUA  OF  NOllTIC  AMEllICA. 


[I'Aiir  ir. 

Jiiurj^nii,  as  ill  tlio  rcst'iiililiiiu:  spcfics,  hut  also  ii|)(iii  tlii'  ^i'lTutcr 
Jiai'l  ((t'llic  iii»|»iT  sitlc.  liaiiirllu'  of  llii;  liypDpvji'iiilii  of  oi'iliiiai'V 
si/.f,  rouiidiMl-ovuto,  on  llif  iippri'  and  apical  niai'i^iii  iiarmw  ly  Imr- 
(it'i't'd  willi  l)iai-l<,  liii'  ialtiT  ja;ii;'(Ml  and  IViiiffi'd  willi  hlark  lii'islks. 
Fort'  ••i).\iu  }('llt)wish-\vliilt',  and  i'.\('('|it  sunii'  i)laclv  i»ri,>tl('s  nrar 
tlicir  lip.  I)('si't  witli  (tnly  very  delicate  nunnti'  uliiti>li  luiirs.  Mid- 
dle and  liind  coxiu  of  the  same  color,  the  I'ornii'r  darker  only  at  tin; 
liasis.  Hind  femora  liefore  the  lip  with  a  hiaek  hrislle,  n|Min  llio 
nndei"  side  ciliated  with  ai)out  ('»  to  7  yellowish  hairs;  hind  tihiiu 
rather  stont,  hnt  not  thickeiu'd  ;  in  very  dark  colored  specimens 
.sometimes  near  the  tip  and  also  n[>on  the  fore  and  hind  side  with 
a  little  hruwii  blot;  upon  their  hind  side  only  a  short  ^lalirons 
stripe,  which  does  not  reach  to  their  nuddle;  fore  tarsi  slender, 
l>lain,  al)ont  I.',  times  the  len,u-th  (d'ihe  tibia";  only  their  last  joint 
black.  Miihlle  tarsi  from  the  tij>  of  the  lirst  joint  brownish,  to- 
wards the  end  blackish-brown,  in  paler  specimens  fi'enerally  but 
nnxleralely  Itrownish.  Hind  tarsi  generally  entirely  black,  sonu;- 
times  paler  towards  the  end  of  the  lirst  joint  or  also  at  tiie  end 
of  the  second  joint ;  in  the  palest  specimens  Itntwnisli  only  towards 
the  end.  Ciliii  of  the  teguhe  yellowisli.  Winji-s  rather  dis- 
tinctly cdiiyish-yellow  ;  veins  clayish-yellow  ;  the  fourth  htngitudi- 
val  vein  not  broken  ;  the  costa  near  the  tip  of  the  lirst  longitudi- 
nal vein  with  a  litth;  swellinjj;. 

Ildl).    Washing'ton.^     (Osten-SacKcn.) 

(tlixvrrnlion. — With  regard  to  a  female  which  may  be  tak<'ii 
for  that  of  the  j)resent  sjjeeies,  the  necessary  remarks  have  been 
made  in  the  observation  to  the  previous  species.  However  un- 
usual the  inconstancy  in  the  coloring  of  the  tarsi  of  />.  hdciiicniiiii 
and  of  JJ.  ruridOilix  nniy  be,  1  have  no  douljt  that  these  varieties 
do  not  represent  dilVerent  species.  At  least  the  most  attentive  ex- 
amination of  the  specimens  distinguished  by  the  coloring  of  their 
feet,  did  not  lead  to  the  discovery  of  the  slightest  tlilferenco  in 
the  plastic  characters  in  one  as  well  as  in  the  other  species. 


wM 

^M 

K 

mm 

wM, 

wm^i    ' 

■'rBm 

pVk/.  iH 

sxm 

^>' 

s 

Ml: 

III 

II 

i',W 

K 

W^i 

H  : 

^i 

iir'K  :    ,  , 

m 

\'':?!^    :    '%^ 

n.    Ciliii  of  the  tcijuhr.  hhich, 

1.  Fourth  longitiKliih'il  vt-in  broken. 

a.  Aiiteiiiue  black. 

J4tt.  1>.  raiiiif«*r  LoKW.     %    aii'l    9. — Obscure  virifli-aeneus,  tlior.-icis 
duiso  iii;ii(;o-iiigro,  facie  albii,  autenuis  iiigris,  ciliis  ouuloruiu  iiifcriorilius 


'm 


uni.TriioTMS. 


r.:] 


nlliiili!*,  ti'pularum  cillis  iiij^ris,  ixjililiUH  tlaviH,  nlnrum  Vf>iii\  lonf.'ituiliiiali 
<|ii:iilil  n|i|it'ii<liu'uliitil. 

]»aik  liioiizi'-nrct'ii,  iiippcr  sidf  of  f  1m«  tluuax  liioiizc-tiliick  ;  faco  white  ;  aii- 
fciiii.'i'  Mack  ;  i^llia  of  tin'  lowi-r  arliit  whitish  ;  cilia  of  thti  tciiula'  yi'l- 
lowisli ;  tliu  fourth  hinuitiiilinal  vein  with  a  .stiiiii|>  of  u  vciii.  Lc^iig. 
cor)).  l). i:t.     Long.  nl.  (Mil. 

yvx.   JJolicliiijiiis  niiiii/'fr  Li)i;\v,  Ncuc  Hcilr.  Vlll,  lH,  1(1. 

Park  l»rnii/.('-<fi'('i'ii,  tlio  iipiMT  .'^iilc  of  the  lliumx  more  linoizt'- 
liliirL  |''ac(*  of  (li(!  (^  ticiii'ly  IIS  hrniid  us  llnit  of  the  J,  in  Itutli 
srxcs  white.  A iiteiniiP  lilack  ;  llie  lower  corner  of  tlu*  fii'st  Joint 
coiori'il  isoinowliat  iijuliler;  in  iIk;  J*  iIk;  tliinl  joint  is  railier  joii'; 
elliptic  with  ti  pointiMl  ti|i,  anil  the  i>|i))ari  iitly  han;  arista  inserteil 
(|iiiti'  near  lln;  lij);  in  tin;  ?  it  is  percept ilily  shorter,  mid  lias  a 
k'ss  ]toiiiteil  tip,  to  wliicli  llio  iiristii  is  still  iiioro  approxiiii.iteil. 
Kroiil  hluish-black,  very  Iiriu-lit.  ("iliii  of  the  inferior  orhil 
whitish.  Upper  side  of  tlii;  thora.v  lii'oii/e-l)lii(dv,  or  iiiorc  dark 
l)roii/.c-};i;ri't'ii.  Al)doinen  soiiiewhaf  coppery.  Foro  coxu'  dark 
yellow,  at  till)  cxtreiiit'  liasis  somewhat  lihickeiied,  Itcsi't  upon  the 
fore  siilo  with  short  iniiiiiti'  lilaek  hairs.  Middle  and  hind  coxsu 
hiackisli,  dark  yellow  only  at  the  tip.  Feet  dark  yelhiw;  the  fore 
and  iniddle  tarsi  from  the  tip  of  the  second  joint  l)hiek  ;  the  hind 
tarsi,  inidudiiif;  the  tip  of  tlie  hinil  tihiie,  hhick.  I'he  hind  femora 
soniewliat  hroad,  before  the  end  with  a  liristle.  Cilia  of  the  teji-iilie 
Idack.  AVin,!j,'s  hyaliiie-ji-ray  ;  the  fourth  loiitritndiniil  vein  hroken, 
so  that  its  inferior  aiig'le  is  a  riji'ht  one  and  the  superior  is  rounded, 
the  former  is  sni)plied  with  a  rather  lont;;  stump  of  a  vein. 

Jliilc.  Lamelhe  of  the  hyiiopycrinm  white,  rather  small,  round- 
ish, at  the  upper  and  apical  mar>;'in  only  with  iiii  extremely  nar- 
row dark  border,  on  the  latter  Iiiit  very  little  jiiL^ired  and  friiifi'ed 
with  black  bristles.  Jliiid  femora  very  sparsely  ciliated  with 
moderately  loii«^  whitish-yellow  hairs.  Hind  femora  rather  stout, 
the  ji'reater  part  of  their  hind  side  li'hibroiis.  Costa  with  a  small 
tiwellinu;  at  the  tip  of  the  first  loii<;'itudiiial  vein. 

J/(ih.  Neliraska.  (Dr.  llaydeii.)  Lake  Wiiinipeir.  (Keimicott.) 
New  llochelle,  N.  Y.      (Osteii-Sackeii.) 

h.  Antennae  yellowish-red. 

24.  D.  Ilifractlis  Loew.  %  and  9  • — Aeneo-viridis,  thoracis  dorso 
poUino.so,  opaco,  alidoniine  eupieo-niicante,  facie  alliida,  iiiterdnni  ex 
tlavo  cinerea,  antennis  rails,  ciliis  ociiloriini  inl'erioril)US  aliiidis,  clliis 
tegularum  nigris,  alarum  vena  longitudinali  (iuarta.  appendiculatil. 


i  ■'-•  I 


;!■  ■! 


•■i;"'i''.i. 


i 

-.1 

■■I;-- 

i,  . 

( 

'  1    ' 

':,■■ 

1    . 

■     1 ;  * 

,.mS 


54 


DIPTEUA  OF  NORTH  AMERICA. 


[part  II. 


'i" 


Bron/e-greeii  ;  uppor  side  of  '.he  thorax  not  very  bright,  tlull  ;  abdomen 
with  a  coppeiy-reJ  rellHctioii ;  fauo  whitish,  sotiietiiiies  riioro  yellowish- 
gray  ;  antenna)  red  ;  cilia  of  the  inferior  orbit  whitish  ;  cilia  of  the  tegub'=; 
black  ;  the  fourth  longitudinal  vela  with  a  stump  of  a  vein.  1  jng. 
Corp.  0.22.     Long.  ai.  0.17. 

Sy.n.   Dolirhopiis  hifrnclas  Loicw,  Neue  Beitr.  VIII,  19,  17. 

Uroiize-L'"!  .'Oil,  l)iit  little  sliiniii"''.  Face  wliitisli,  in  not  rccciitlv 
t'xcliuk'd  spL'cinioiis  fi-cnoriilly  more  yoUowisli-gray  ;  in  tlic  ^  il  is 
ii()'<  mncii  uaiTowoi' tliuii  in  the  V.  Antennie  red;  tlicif  tliird 
julnl  ovate,  soniewliat  hroad  ;  at  tlie  point  of  insert i(jii  of  liie  arista 
it  is  somewhat  swollen  and  blackened  ;  its  apical  half  is  lil'teii 
brownish.  Arista  wiih  a  very  short  bnt  distinct  pnbeseence. 
Front  bronze-g'reen,  but  opaque,  on  account  of  a  very  delicate  lig'lit 
))ro\vnish-gray  dust.  Cilia  of  the  ini'erior  orbit  whitish.  Upon 
the  upi)er  side  of  the  thorax  the  ground  c(»lor,  altliouuh  bronze- 
o'reen,  is  (piite  opa((ue,  on  account  of  a  dens(^  l)ro\vnish-jiray  ilust, 
which  in  fresh,  nut  denuded  siicciniens,  alto,n'ctlier  conceals  it. 
Abdonu'U  lu'ifi'htcr  metallic-green,  in  not  recently  excluded  spc(,-i- 
niens  rather  coppery.  Coxa'  and  f"et  yellow  ;  the  middle  coxio 
ui>  to  the  tip  gray  ;  the  front  side  (jf  the  lore  coxie  s|>arsely  beset 
with  delicate  nunute  black  hairs,  glabrous  towards  the  basis. 
Hind  femora  before  the  tip  with  a  bristh-.  Foi'c  tarsi  itrownish, 
only  the  last  joints  really  black.  Middle  tarsi  IVoni  the  tip  of  the 
first  joint  blackish;  the  extreme  tip  of  the  hind  tibia',  including 
the  whole  hind  tarsi,  l)lack.  Cilia  of  the  leguhe  lilack.  AVings 
with  a  rather  dark  grayish  tinge  ;  on  the  anterior  margin  and  along 
the  veins  generally  somewhat  brownish;  the  fourth  longitudinal 
vein  broken  twice  at  right  angles  ;  l)oth  angles  sharp  ;  as  an  ex- 
ception, the  ui)per  one  sometimes  slightly  rounded;  at  the  lower 
tingle  there  is  generally  a  stumi)  of  a  vein,  whilst  the  upper  one 
for  the  most  part  has  none. 

Mule.  Lanu'lhe  of  the  hy])opygium  while,  of  modei-ate  size, 
rather  rounded,  on  the  upper  ami  apical  margin  narrowly  Ixir- 
dered  with  black,  on  the  latter  somewhat  jagged  and  fringed  with 
black  l»ristles.  Fore  tarsi  1j  ti: 'cs  the  length  of  the  tibia-;  lirst 
joint  souH'what  hmger  thai;  the  second  and  third  taken  together; 
fourth  and  fifth  joints  black,  somewhat  llatteiied,  the  u])])er  edge 
of  the  fifth  bearded  with  close  black  hairs.  Hind  tibiic  plain, 
their  hind  side  not  glabrous. 

Uab.   Chicago.     (Osten-Sacken.)     Nebraska.     (Dr.  Ilayden.) 


•4 


DOLICIIOPUS, 


55 


25.  I).  Tittatlis  LoEW.  %  . — Aoneo  viriilis,  tlioracis  lineii  media  vit- 
tisiiiu;  lat«ralilni8  orichalceis,  facie  albida,  anteiini.s  nifis,  cilii-s  oeuloruiu 
inff lioribiis  allndis,  tcgiilaniiii  ciliis  iiii^ris,  peilibus  llavis,  tarsis  maris 
siiiiiilicihus,  alarum  vena  loiigitudiiiali  (jnarta  t'lauta  et  appeudiculatii. 

Broii/f  green;  middle  line  and  the  two  lateral  stripes  of  the  thorax  brassy 
yi'llow  ;  face  whitisli ;  antennae  red  ;  cilia  of  the  inferior  orhit  wliitish ; 
cilia  of  the  tegulie  black;  teet  yellow;  tarsi  of  the  %  plain;  fourth 
longitudinal  vein  broken  and  furnished  with  a  stump.  Long.  corp. 
O.lii;— (1.127.     Long.  al.  11.2")— (i.:i(). 

Syn.    JJolirhojiiis  vittalus  LoHW,  Neue  Ueitr.  VIII,  20,  18. 

iJroiizc  jiTC'i'ii,  sliiiiiiijr.  Fiicc  rntlicr  broad  for  a  J*,  wliitish. 
AiitciiiiiO  ivd,  apical  half  of  the  tliird  joint  soincwhat  iiifiiscatcd ; 
arista  witli  a  short,  distinct  j'lihcscciicc.  Front  metallic  o'rceii, 
or  ui'ccnisli-lihu',  shinin.i;'.  Cilia  of  the  inferior  orhit  ycllowish- 
whitc.  rpjjcr  side  of  the  thorax  green  or  hhie,  with  a  consjiicu- 
ons.  almost  golden-yellow  or  more  copper-colored  middle-line,  and 
with  similar  lateral  stripes.  Lanu'lhe  of  t!ie  liyiiopyii'inm  white, 
of  moderate  size,  mirrow-ovate  in  sha])e,  with  a  narrow  black 
margin  on  the  upper  and  the  apical  edge;  the  latter  jagged  and 
fringed  with  hlack  bristles.  Coxa;  and  feet  pale  yellowish;  iho 
lore  coxa'  are  beset  on  their  anterior  and  inner  si  with  numerous, 
on  the  outer  side  with  very  scarce,  small,  Itlack  hairs,  besides  the 
white  pubescence  which  clothes  them;  the  middle  coxa?  upon  tho 
greater  ])art  of  their  outside  blacUisli.  Hind  femoi'a  before  their 
end  with  a  bristle.  Hind  tibia'  of  the  ordinary  size,  upon  their 
hind  side  with  a  glalirous  stripe,  which  extends  beyond  their  seciiud 
third.  Fore  tarsi  ])lain,  only  very  little  longer  than  the  tibia',  from 
the  middle  of  the  third  jnint  lilack;  the  uiidille  and  hind  tai'si  are 
lilack  from  the  tip  of  the  lirst  joint.  Wings  grayi>h-hyaline, 
towai'ds  the  fore  margin  xmi'  vvhat  nioi-e  iii'own  ;  cosia  iieiir  tho 
tip  of  the  lirst  longiludinal  vein  with  a  very  thick  swelling;  fourth 
longitudinal  vein  broken  :  superior  angle  of  the  tract ure  rounded, 
infei'ior  one  with  onlv  a  short  stomp. 

JIab.   Chicago;  Gencssee,  X.  V.     (0.-'tcu->Sackcn.) 


'^'  ' 


■  It 
■(• 

.1; 

1^- 


::  t-l 


2<i.  1>.  rJiprimis  Wifd.  %  and  9 .— Aenco-viri.lij,  thoracis  lineii 
media  vittis(iue  lateralil)us  orichalceis,  facie  t>x  tlavo  albida,  .■intcnin's 
rntis.  eiliis  ocuilorum  inferiorilius  albidis,  tegul.iruni  ciliis  uIltIs,  jnHli- 
Ims  llavis,  taisoriun  anticoru.ii  apice  in  mare  dilaiato,  alls  basim  versu.s 
lion  angustatis,  vena  longitudiuali  (piarta  fracta. 


56 


DIPTERA  OF  NOIITIE  AMERICA. 


[PAllT  II. 


Mp*.illic  green,  mirldle  lino  and  lateral  stripes  of  the  thorax  brassy  yellow  : 
face  yellowish-white ;  antennaj  red ;  cilia  of  the  inferior  orbit  whitish, 
cilia  of  the  teguhe  black ;  feet  yellow  ;  tij)  of  the  fore  tarsi  of  the  %  en- 
larged ;  wings  towards  the  base  not  narrowed  ;  fourth  longitudinal  vein 
broken.     Long.  corp.  U.^.") — 0.2(j.     Long.  al.  0.24. 

Syn.  Dolichoptis  ciiprcuA  Say,  Journ.  Ac.  I'liilad.  Ill,  8C,  9. 

Dolivhopus  ciiprinu-i  Wirokmann,  ZweiH.  II,  230, 1. — Walker,  List  III, 
CUO.— LoEW,  Neue  Beitr.  VIII,  20,  19. 

iMotallie  grooii,  sliiniiif^.  Face  whitisli,  with  a  more  or  less  ycl- 
lowisli  liiifiT',  i)arti('iilarly  tliat  of  the  J",  wliioli  is  considerably 
narrower  liian  tliat,  of  the  9.  Aiitennu!  yellowish-red,  the  apieal 
half  of  the  third  joint  often  infuseated.  Arista  with  short  l)iit 
distinct  pubescence.  Front  shininj?,  bluish-green.  Cilia  of  the 
inferior  orbit  whitish-yellow.  Ujjper  side  of  the  thorax  green, 
often  bluish-green,  seldom  blue,  with  a  consjjicuous  yellow  brass- 
colored,  sometimes  copper-colored  middle  line  and  with  similar 
lateral  stripes.  Abdomen  usually  more  bronze-green  or  coi)pery. 
Coxa)  and  feet  pale  yellowish ;  lore  coxie  only  on  the  inner  margin 
of  their  anterior  side  with  sparse  minute  black  hairs,  which  are 
more  distinct  in  the  9  than  in  the  J*  ;  michllc  coxiu  niton  the 
greater  jtart  of  their  outside,  I)lackish.  Ilind  femora  with  a  ))ris- 
tle  before  the  tip.  Fore  tarsi  fi'om  abo^it  the  middle  of  the  third, 
middle  and  hind  ones  from  the  tip  of  the  first  joint,  bhu'keiied. 
Cilia  of  the  teguhe  black,  ^\'ings  tinged  with  gray,  towards  the 
fore  nuirgin  more  grayish-brown,  not  more  narrowed  than  usual 
towards  the  base;  the  fourth  longitudinal  vein  broken,  so  that  its 
inferior  angle  is  a  sharp  right  one  and  the  sujierior  is  rounded; 
the  former  is  supplied  with  a  short  stump  of  a  vein. 

Male.  Lamelhe  of  the  hypopygium  of  moderate  size  and  of 
elongated-ovate  form,  white,  narrowly  bordered  with  black  on  the 
njjper  and  apical  margin ;  the  latter  jagged  and  besot  with  black 
bristles.  Hind  femora  u]«in  the  second  half  of  their  under  side 
sparsely  ciliated  with  very  long  yellowish  hairs.  Hind  tibiio  not 
thickened,  upon  their  hintl  side  with  a  glabrous  stripe  extending 
beyond  the  middle.  Fore  tarsi  not  one  and  a  half  times  the  length 
of  the  tibiie,  two  fir.st  joints  stalk-like  ;  first  joint  nearly  one  and  a 
half  times  the  length  of  the  second  ;  three  last  joints  slightly  fiat- 
tened,  third  joint  upon  its  upper  side  very  densely  fringed  with 
longer,  the  fourth  with  somewhat  shorter  black  hairs ;  the  three 


p 


.vti- 


[itf;,.! 


DOLICIIOPUS. 


0( 


last  joints  of  the  tarsi  aro  about  as  lung  as  the  second  ;  the  two 
last  ones  as  long  as  the  third. 

Ilah.  Middle  States.  (Osten-Sacken.)  Xebraska.  (Dr.  Haydcn.) 
O/iscrrd/ioii. — The  determination  of  this  species,  tlie  most 
common  in  the  ^Middle  States,  is  not  doubtful  when  we  compiiro 
the  descriptions  of  Saij  and  Wicdcniann,  which  servo  to  complete 
each  other.  Tlio  9  is  easily  distinguished  from  that  of  />.  loin/i- 
jicnnix  by  its  less  narrowed  basis  of  tlie  wings.  Jts  distinction 
from  the  as  yet  unknown  9  of  />.  ri/lalus  must  be  very  dillicult, 
unless  perhajK  lli<  )»ro]>ortional  length  of  their  feet  affords  an  avail- 
able nuirk  ot'  (lisli  on.  Two  males  measuring  only  (\.'2'.\  in 
length  resendjie  in  aii  plastic  characters  the  ^  of  i).  ciiin-inns  so 
much  that  I  take  them  merely  for  asmallervariety.  A  single,  un- 
fortunately not  well-preserved  ^,  distinguished  by  a  somewhat 
larger  size,  may  jx'rhaps  constitute  a  piii'licular  species,  as  the 
fourth  longitudinal  vein  is  less  broken,  and  the  three  last  joints  uf 
the  fore  tarsi  are  a  little  broader.  It  would  not  be  safe,  however, 
to  decide  upon  a  single  speciuicii. 

21.  D.  Ioiisil»eiiiiis  LoEw.  %  ami  9  •—-^t'lu^r.-viridis,  thoracis  linei 
media  vittistjue  latcralihus  oriclialceis  plenniiiiue  suliobsoletis,  facie  ex 
flavo  albiilfi.  anteiniis  riifis.  ciliis  ocuhirum  iiifiTiorihus  all)i(lis,  ti'irularum 
ciliis  nigiis,  jR-ilibus  tlavis,  maris  taisorum  aiitiuoium  apite  dilatato  et 
alls  basim  versus  valde  angustati.s. 

Metallic  green  ;  midiUe  linn  and  lateral  stripps  of  the  thorax  of  a  hrassy- 
yellow  color,  howivt'r,  mostly  indistinct;  face  yellowish-white;  ant(?n- 
II re  red  ;  cilia  of  the  inferior  cvliit  whitish;  cilia  of  tht;  tegulro  hlack ; 
feet  yellow  ;  the  tip  of  the  fore  r.si  of  the  male  enlarged  and  its  wing.s 
very  much  narrowed  towards  the  basis.  Long.  corp.  (.'.-iJ.  Long.  al. 
0.2i;— (I.-.27. 

Syx.   fJiilii  liopn.<:  loiijlpeniiia  Loew,  Neue  Bcitr.  VllI,  21,  20. 

J}ronze  green,  shining.  Face  white,  often  more  or  less  yellow- 
ish. Antenme  red.  the  second  half  of  the  third  joint  sometime.^ 
infuscated.  Arista  with'a  rather  >hort  but  very  distiiu't  ]ndicscchce. 
Front  shining,  green  or  Idnc.  Cilia  of  the  iurccinr  (U'bit  wliitisii- 
yellow.  rppcr  side  oj'  tiic  ilioriix  with  a  brass-cnhircil  middle  lino 
and  similar  latcrnl  striix-^.  w-hich,  howrver.  are  less  distinct  than 
in  the  two  previous  specif'*.  Alxlomen  often  very  coppery,  ])iir- 
ticuhii'ly  upon  its  posterior  Iin-l'f.  ("oxic  and  feet  ))ide  yellowish; 
fore  co.\iu  ouij  w*i  tlio  iiwurr  luaryiu  of  their  anterior  side  witli  a 


^ . 


'  •!  ;■ 


.-i'  t 


I 


V     1 


It  .^t 


58 


Dll'TKIlA  OF  NOllTII  AMKIIICA. 


[ 


PART  ir. 


few  indistint't  iniiiute  black  hairs  ;  iiiiddlo  coxa!  u]k)ii  llic  jiTCiitor 
part  (jf  llit'ir  oiitsido  ^'ravish.  Hind  Iciiiora  Ix'f'orc  llic  tij)  wiili  a 
hrisllc.  Fore  tarsi  Ijlacivened  fi'din  tiie  iiu<ldle  of  tlie  tliii'd  joint ; 
middle  and  hind  tarsi  inluscated  from  the  lip  «)f  the  lirst  joint, 
and  towards  their  end  gradually  (-(dored  with  hlack.  'rciiuhc 
with  hhick  cilia.  AVings  tinged  with  gray,  towards  the  lore  mar- 
gin more  yellowish-l)rown,  towards  the  hasis  narrower  than  in  the 
relaxed  species;  the  fourth  longitudinal  vein  not  s(»  nuu'li  broken 
as  in  the  two  i)revious  .s))ecies,  the  lower  angle  of  the  fracture 
genei'ally  without  stump,  yet  sonietinu's  with  a  very  short  one. 

Male. — Lamelhe  of  the  hy]>opyginm  of  moderate  size  iuid  of  sin 
elongated  ovate  form,  on  the  upper  an<l  apical  margin  i)or(lered 
vith  black  ;  the  latter  one  vei'y  much  jagged  and  fringed  with 
black  bristles.  Iliml  femora  not  ciliated.  Jlind  tibiie  not  thick- 
ened, l.airy  upon  their  entire  hind  side.  Fore  tarsi  somewhat 
longer  than  the  tibise  ;  two  lirst  joints  stalk-like,  the  first  hardly 
one  and  a  (pnirter  the  length  of  the  second  ;  the  three  last  joints 
taken  together  hardly  long»-r  than  half  the  second  joint,  but  very 
little  llatteiH'd,  tinged  witii  lilack  beyond  the  middle  of  the  third 
joint;   the  third  joint  UijiMm  its  upper  i^'.X'^ii  densely  fringed  with 


niii's  o 


still  tl 


f 


u'lr 


longer,  the  fourth  with  -omewhat  shorter,  black  hairs. 

a  renmrkalile  length,  unusually  narrow  near  the  basis 

rounded  amd  angle  pri'  <i'ting  abnost  in  the  shape  of  a  lobe  ;  the 

costa  mar  the  tip  of  thie  lirst  longitudinal  vein  with  a  but  slight 

swelling. 

JInb.  Middle  States;  Washington,  I).  C.  (al)undant  in  June; 
Osten-Sacken) ;   Chicago  (i'i.). 

i)h^vrv(itii)u. — I  am  in  {Mjssession  of  a  9  which  was  eommuni- 
eated  to  me  as  that  of  the  ])resent  species,  l)ut  which  I  consider 
as  that  of  1>.  srrijiKldri.-!.  .\s  />.  IniKjijxiiiii.-^  sometinu's  ociiirs 
■without  distinct   fracture   on    the  fourth  longitudinal  vein, 


it 


happens,  on  the  ('(uitrary,  that  in  some  specimens  of  7>.  sccijuihin's 
the  fourth  longitndimd  vein  is  sonu'what  broken;  they  are  how- 
ever easily  distinguished  from  J).  l<iii'/i/i('iiiii,-<  l)y  the  pale  color- 
ing of  their  humeral  callosities.  The  latter  differs  l)esides  from 
the  females  of  all  related  species  by  its  wings,  which  are  somewhat 
Harrowed  at  the  basis. 


DOLICHOPUS. 
2.  Fourth  longitudinal  vein  not  broken. 


69 


a.  Antennso  red,  at  the  utmost  tlu;  third  joint  at  the  tip  or  almost 

entirely  black. 

a.  Humeral  callosities  of  the  same  color  with  the  thorax. 

2S.  1).  liastatllH,  nov.  sp.  %  and  V- — Viridis,  antennis  rufis,  arti- 
ciilo  tt'itio  ex  parte  nigro,  ciliis  oculorum  int'ei'ioribus  tliivis,  ti'guliiruui 
ciliis  iiigrirt,  pedibus  tlavis,  tibiis  intermediis  mai'is  ante  apicciii  per- 
spicue,  fccniinte  obsoletissinie  albido-notatis,  tarsis  intciinedils  maris 
aiiii'cni  versus  coiiipressis,  fijcmime  subcoinpressis,  alarum  venil  longi- 
tudinal! (juarta  non  t'ractd. 

Green;  antennie  red  ;  third  joint  partly  black ;  cilia  of  the  inferiol- oibit 
yellow,  cilia  of  the  teguho  black  '.  feet  yellow  ;  middle  tiliiie  before  the 
tip  with  a  white  spot,  which  is  ve!\v  distinct  in  the  X, ,  and  indistinct 
in  the  f  ;  middle  tarsi  strongly  llatteneil  towards  the  tip  in  the  'J, ,  and 
more  slightly  in  the  J  ;  fourth  longitudinal  vein  not  broken.  Long. 
Corp.  0.22.     Long.  al.  0.22— U.2;5. 

Tliis  si)0('ic's,  (listiiij^'uislit'd  by  many  ])cc'iiliar  niiirks,  rosoiiiblcs 
in  tlio  structure  of  tlie  J*  arista  J>.  ,<(if/illar/t(,H  lioew,  from  Siljo- 
ria.  l>roiizo-grei'ii,  shining.  Face  of  the  J*  narrow  and  Iirassy- 
vcllow  ;  tlio  face  of  the  9  is  luiu'li  broader,  and  has  a  •'•ravish-yol- 
low  lingo.  ral]»i  yellow,  in  tlie  9  towards  the  basis  blackish. 
Aiiteiuiio  re(blish-yel](»w ;  their  tliird  joint  short  and  rather 
rounded ;  its  apical  half  black  or  Ijrown  ;  the  arista  of  the  9  i.s 
plain  and  rather  stout;  that  of  the  (^  is  longer  and  more  slender, 
enlarged  at  the  tip  into  the  .shape  of  a  lancet-like  lamel  pointed  on 
both  sides,  the  tip  of  which  lias  a  dingy-whitisli  colnring.  Fi'DUt 
shining  ])luish-greeii.  Cilia  of  the  inferior  orbit  yelhtw.  Fore 
coxie  yellow,  upon  the  anterior  side  with  a  delicate  black  ]ud)es- 
cence.  Middle  and  hind  (•().\je  grayish-))lack,  only  the  extreme 
tij)  and  the  trochanter  yellow.  Feet  yellow.  Hind  fVnu)ra  IjcCore 
the  tip  with  u  bristle.  Middle  tibiic  with  black  tij),  and  l)efore  it, 
in  the  ^,  upon  the  ujjper  side  with  a  whitish  spot,  of  which  there 
is  hardly  a  trace  in  the  9.  lliml  tibiieat  the  tip  ]»lackish-br()wn, 
in  the  J*  upon  the  hind  side  with  a  narrow,  linear,  hardly  distinct 
glabrous  stripe.  The  tarsi  have  the  tip  of  the  first  joint,  the  lour 
following  joints,  and  lie.sides,  the  base  of  the  first  joint  of  the  mid- 
dle tarsi,  ))lack  ;  the  three  last  joints  of  the  middle  tarsi  of  the  J* 
are  distinctly,  although  not  very  strongly,  flattened;  this  is  also 
the  case  in  the  9,  l)nt  less  perceptibly  so;  this  part  of  the 
middle  tarsi  viewed  from  the  side  seems  distiuetly  stouter  tliau 


■■<■: 


;  ^  la. 

.1  ■■.•'!•;■ 


if'.,     t        A 


.!<. 


.';-  .1  ; 


'11^.  •; 


»h:^ 


h 


CO 


DIPTEUA  OP  NOHTII  AMKllIPA. 


[I'AUT  II. 


Slf•.»'^'.^.,/      , 


wlicii  it  is  seen  from  alxivo  or  holow.  Tiio  first  joint  of  tliu  liiiid 
tarsi  wilii  only  two  tliorii-lilio  brislics.  Cilia  of  tlio  tcji'iihu  l)lack. 
AViiiU's  ji'rayisli-liyaliiii'  ;  tlio  last  sc.uiiiciit  of  the  i'ourtli  ioiijiiliidiiial 
vein  is  iiilk'ctrd  hclbrc  its  niiddlo  hut  not  broken.  Tlic  wind's  of 
tilt'  J*  art'  sonicwliat  narrower  than  tlioso  of  the  9,  and  liave  he- 
foi'(^  tilt'  anal  anji'lu  a  very  rtniarkalilo  lar^'t'  hisiiiiiah'd  cxcisinn, 
so  that  the  an.ii'Ic  assiinu'S  tlit'  sliapt'  of  an  indc|»c'iid('iil  lolH;-like 
aitpciidiiL'e.  Laiiiclhu  of  tlio  iiypopy.a'iiiin  of  iiiodcrato  size, 
roiindtd-ovatc,  whilish,  with  a  rather  broad  black  border,  on  liio 
uj)]»er  and  apical  niariiin  jaji'ued  anil  I'riiiji'ed  with  black  liristles. 
Jhb.   Sitka.      (Sahlljerj--.) 

29.  1>.  Iilmitipos  Scop.  %  and  '^. — Viridis,  liunicris  rmicoloiibus, 
anteiiiiis  riilis,  articiilo  tertio  prajtur  basiiii  nigro,  f'ai;i((  auica,  uiliis  (icu- 
lorum  iiil'(!ii()ril)iis  llavis,  tegularum  ciliis  iiigris,  pedibus  llavis,  artidulo 
tarsoruin  iiitfriiicilidiuiii  piiino  maris  sutulis  iiigris  jwiiuato,  alarum 
Vena,  lougitudinali  ijuarta  non  fra(;ta,. 

Green,  including  the  huiiieral  callosity  ;  third  joint  of  the  red  antennre 
with  the  exception  of  its  basis,  bl.uek  ;  face  golden-yellow  ;  cilia  of  tlia 
inferior  orbit  yellow  ;  cilia  of  the  tegnla;  black  ;  fetit  yellow  ;  lirst  joint 
of  the  middle  taisi  of  tlui  'J,  fcatiicred  with  black  bii.stles  ;  fourth  lon- 
gitudinal vein  not  brcdceii.     Long.  corp.  0.17— U.lJ.     Long.  al.  (.1.18. 

Sys.  Miiiird  jihuiiijxs  Sroi'01,1,  Ent.  Carn.  olU,  Si),'). 

Dclir/nijnts  jii  iiiiitarsi.i,  Fai.i.kn,  Doliidi.  11,  !(!. — MKUiEN,  Zweifl,   IV, 

i)(i,  21). — Machuakt,  Suites,  I,  440,  34.— Stanmi's,  Isis,  Is.'U,  <;:i,  14. 

Zhttkustkdt,   Ins.   Lapp.,  7U!),  9. — Stakokk,  Kroyer's  Tidsskr.  30, 

21. — Zkttkustkdt,  Dipt.  Scand.  II,  541,  3,">. 
DoUchoims  i>lHmi]>cs  Wai.kkk,  Dipt.  Brit.  I,  1(12,  IG. 

]\rotallic-o'rcen,  soniotinu's  somewhat  co]ipt'ry.  Antonna3  yel- 
lowish-red, third  joint,  exccptins:  its  basis,  I)lackened  ;  that  of  tlio 
J*  ovate,  with  a  rather  sliar})  anjz'lo  at  the  end  ;  that  of  the  9 
sliorter.  Front  metallio-g-reen.  The  face  reaches  hnver  here  than 
in  most  other  species  of  DoUchopus ;  that  of  the  ^  is  rather  nar- 
row and  irolden-yellowisli ;  that  of  the  9  is  broad  and  palc-graj'- 
ish,  dusted  witli  whitish-yellow.  J'alpi  yellow.  Cilia  of  the  in- 
ferior orl)it  yellow.  Fore  coxie  yellow,  Avitli  a  black  i)ubef  cence 
anteriorly ;  middle  and  hind  coxic  blackish,  the  extreme  tip  ami 
the  trochanter  yellow.  Feet  yellow.  Ilind  femora  with  a  bristle 
before  the  tip.  The  middle  tibia;  are  but  slip'litly  infuscated  near 
tho  tip ;  the  tip  of  the  hind  tibiie  is  somewhat  blackish,  this  color 
occupying  but  a  narrow  extent.     Fore  and  hind  tibiic  plain  in 


i'i;,i 


\\  I II  P^pi^,n"  , 


DOLICIIOPUS. 


61 


both  soxcs ;  the  middle  tlbiiu  only  in  the  9  ;  in  the  J*  thoy  arc 
roniarkiiltly  slondor,  only  sdiiiowhat  stouter  at  the  liasis  and  near 
the  tip;  on  the  upijor  side  with  a  hhieliisii-hrown  ionfiitudinal 
line,  which  reaches  IVoni  the  incrassation  at  the  base  to  that  at  tlio 
tip;  they  show  besides,  just  before  the  apical  incrassation,  a  small 
whitish,  not  always  distinct,  crossljand.  Fore  and  hind  tarsi  plain 
in  both  sexes  ;  the  tbrnn'r  from  liie  ti})  of  the  first  joint,  the  latter 
altof^'cther,  black;  middle  tarsi  also  altoji'ether  l)lack,  phun  in  the 
9  ;  tlieir  first  joint  in  the  J*  is  sonnnvliat  incrassated  and  densely 
ciliated  on  both  sides  with  oldicpiely  inserted  Idack  bristles,  (.'ilia 
of  the  teji'ula;  black.  "Wings  fi'rayish-hyaline  ;  fonrth  longitudinal 
vein  not  broken ;  in  the  9  they  have  the  usual  shape;  in  tlie  J* 
the  hind  nnirgin  has  a  sinnated  excision  before  the  anal  anii-je. 
The  yellowish-white  lameihe  of  tin.'  hypopyginni  are  of  niodcratu 
size,  elongated-ovate,  narrowly  borderetl  wilh  black,  fring(.'d  with 
black  bristles  along  the  upper  and  apical  edge  ;  the  latter  is  some- 
what jagged. 

Jlatj.   Sitka.     (Sahlberg.) 

()l).-<i'rrafi(in. — I  have  i)een  able  to  compare  n  considerable  num- 
ber of  North  American  specimens  of  this  species,  and  (hi  not  find 
any  diflerence  between  them  and  the  Kurope;  n  ones.  At  lirst  it 
appeared  to  me  that  the  arista  of  the  former  ones  was  percept  il)ly 
stouter  than  that  of  the  latter.  A  more  close  examination  showed, 
however,  that  this  dilferencc  was  merely  illusory  and  produced  by 
some  dust  oii  the  American  specimens  in  my  i»ossi'ssioii.  The 
api>endages  of  the  hy))opygiuni  of  the  North  American  specimen!* 
arc  likewise  precisely  similar  to  tlu.se  of  the  European  ones. 


'W^ 


.1  ■  • 


30.  D.  flllvipes  LoEW.  %. — Viridis,  nitidns,  faoie  anrca,  .nntonnis 
fulvis,  aiticiilo  tertio  piv-eter  basim  nigro,  ciliis  oculoruiii  iiifcrioiibiis 
tlavis,  tegularum  ciliis  iiigris,  coxis  antici.s  pedibnsque  fulvis ;  tibiarum 
intermetliaruin  apice  albo  ;  tarsis  intermediis  slmpliclburi. 

Green,  shining  ;  face  golden-yellow  ;  antenii;c  dark  yeilow,  third  joint,  ex- 
cept its  basis,  black  ;  cilia  of  the  inferior  orbit  yellow  ;  cilia  of  the  tegulte 
black;  fore  coxte  and  feet  dark  yellow,  tip  of  the  niidille  tibiie  wliite ; 
middle  tarsi  plain.     Long.  corp.  0.23.     Long.  al.  ti.li-i. 

Stn.  Dolichopus  fulvipes  Loew,  Berl.  Ent.  Zeit.  VI,  512,  (Jl. 

^letallic-green,  shining.  Face  golden-yellow,  rather  narrow. 
Antenine  saturate  dark  yellow;  third  joint  elliptical,  not  rounded 
at  tip,  black,  with  yellow  basis.     Front  metallic-green.     Cilia  of 


m- 


1 1    ' ' 


!r"  .:(• 


*^ 


',.■    'i'-* 


tm 


"WT" 


C2 


PII'TEIIA  OF  NORTH  AMEUICA. 


[I'AUT  II. 


tlio  inferior  orbit  yellow.  Lniiielhe  of  the  hypopyf^ium  rather 
><iiiiill,  oviite,  whitish,  with  a  narrow  ))la(k  lionler,  jafffred  at  the 
tip  and  with  Idaek  bristles  round  the  edji-e.  Tore  eoxie  saturate 
dark  yellow,  with  black  hairs  ;  {he  four  posterior  eoxu;  Itlackish 
with  a  (lark  yellow  tip  ;  the  rather  stout  feet  also  dark  yellow; 
jiiud  I'eniora  with  a  I)ristle  before  the  tip;  the  middle  tilda-  have 
at  the  tip,  on  the  upi»er  side,  a  whitish,  distiuetly  swollen  sjiot, 
whieh  is  l»are  of  any  hairs  or  bristles;  upper  side  of  the  hind  til)iii3 
with  numerous  l)ristles  ;  there  is  no  g-labrous  si)ot  on  their  hind 
side.  Tarsi  jtlain  ;  the  four  anterior  ones  are  blackened  from 
the  ti])  of  the  lirst  joint  ;  the  base  of  the  second,  sonu'tinies  also  of 
the  thirtl  joint,  renmin  however  pale;  the  hind  tarsi  are  altoi;'ether 
black.  Cilia  of  the  teji'ula;  black.  ^Vill;i•s  u'rayish-hyaliue,  with 
a  wide  sinus  on  the  hind  nuira-in,  I»efore  the  anal  anji'le ;  costft 
hardly  thickened  near  the  tip  of  the  lirst  loniritudinal  vein  ;  the 
last  portion  of  the  fourth  lonji'itudiual  vein  considerably  inflected 
about  tlie  middle,  without  bein;.i'  bi-okeu. 

JIdb.  Jlliuois.    (Le  Baron. )    White  Mountains,  X.  II.   (Ostcn- 
Sacken.) 

31.  D.  sexai'lifUlatlls,  n.  sp.  %. — Anreo-viridis,  nitidns,  nnten- 
uiri  iiitis,  ciliis  oouloruiii  inf'eriorilnis  tlavicantilms,  ciliis  tcgiil;iriiiu 
nigris,  coxis  (uunilnis  pedibusque  llavis,  tar-iis  posteriori tms  iiidc  ab 
articuli  i)riini  npiee  ex  I'usuo  nigris,  alarum  vuiia  longiludinali  (juartfl, 
non  fractii. 

^.  IlypojiVLrii  apit'e  tlavo,  lamellis  albis  late  nigro-linibatis,  tarsoruni  an- 
ticorum  articulis  tril)n.s  priiiiis  eloiiaatis,  llavis,  articiilis  ultiiuis  iluobus 
brevibus  couipressis,  pa'imltinio  toto  atro,  ultimo  in  basi  atro,  in  aiiit-e 
nivt'o  et  appendicuhl  laiuellitbriui,  cum  artiuulo  ipso  concolore,  iiistruuto. 


Gold-groen,  sliining;  antennne  i-ed,  cilia  of  the  inferior  orbit  yellowish,  on 
the  tegubr  black;  all  eoxie  and  feet  yellow,  the  middle  an<l  hind  tarsi 
from  the  tip  of  the  first  joint  brownish-black;  the  fourth  longitudinal 
vein  not  broken. 

^ .  Tip  of  the  hyjiopygium  yellow,  lamell.T  white  with  a  broad  black 
border;  the  three  first  joints  of  the  fore  tarsi  elongated,  yellow,  the  two 
last  ones  short  and  broadly  flattened  :  the  penultimate  entirely  black  ; 
the  last  one  black  at  the  basis,  snow-white  at  the  tip,  provided  with  a 
lamelliform  appendage  of  the  same  color  with  this  joint. 

5 Long.  corp.  U.ii2.     Long.  al.  0.22. 

Golden-jjrcen,  rather  shiinnj^,  still  the  thorax  rather  distinctly 
dusted  with  ochrt  yellow;  front  steel-blue;  scutellum  greenish- 


i;4 


'if 


cl 


roMPiroiM's. 


C3 


blue.  Antcniirc  ycllowisli-rcMl,  the  short  tliird  joint  TiKtro  brnwii- 
isli-rt'd.  Tlie  narrow  fiico  oclirc-ycllow.  Ciliii  of  tlic  int'rrioi* 
orltit  pale  yellowish.  Ciliu  of  tlic  tcfriila'  l)Ia('l<.  IFyponyii'lnni 
of  UHxh'ratf  size,  the  liasal  liiilf  nictallic-^iTccn  or  fi-rccn-hhii',  tlio 
apiraliialf  yellow  ;  the  liiinelliu  rather  larjjfe  and  Iji'oad,  with  a 
rather  broad  l)hu'k  border,  frinjfed  with  black  on  the  n|i]ier  niar- 
jrin  only  ;  jajxfred  as  nsnal,  on  the  apical  niarfrin  and  beset  with 
crooked  ])lack  Itristles.  Fore  coxte  entirely  yellow,  with  a  delicato 
and  short  pnbescenee  ;  near  the  tip  with  black  l)ristles.  Middle 
and  iiind  coxie  of  the  same  color,  still  the  former  more  (»r  less 
blackish  at  the  basis.  Femora  and  tibiiu  yellow;  hind  femora 
upon  the  front  side  before  the  ti|)  with  a  stout  ))ristle  ;  all  femora 
friabrons  upon  their  underside.  Fore  and  middle  tibin}  plain, 
rather  slender,  moderately  bristled.  Hind  tibisu  very  stout, 
thickened  upon  the  basal  half  and  with  a  hnye  frlabrous  spot 
iil)ou  their  himl  side.  Fore  tarsi  slender  and  nearly  twice  as  loiifj 
as  the  tibia';  the  clonfi'atcd,  but  ]»laiii,  three  first  joints  yellow,  of 
uiuch  dccrcasiufr  length,  the  fourth  joint  deep  Idaek,  short,  linVidly 
flattened,  trian^-idar ;  the  fifth  joint  of  the  same  shape,  hardly  some- 
what lonijer  than  the  fourth,  deep  black  at  the  basis,  snow-white 
at  the  broad  tip;  the  unijnes,  ])nlvilli  and  em])odium  inserted  at 
its  lower  end  are  of  the  ordinary  structure  ;  at  the  upper  end  there 
is  a  distinct  ellijitical  lanud.  which,  like  the  joint  itself,  is  deep 
black  at  the  basis,  and  snow-white  at  the  ti]).  "Wings  grayish- 
hyaline,  rather  narrow  towards  the  basis;  near  the  tip  of  the  first 
longitudinal  vein  there  is  l>ut  a  slight  trace  of  a  swelling  of  the 
costa ;  the  latter,  ln)wever,  is  rather  stout  from  this  ])oiiit  to  the 
tip  of  the  wing;  the  last  segment  of  the  fourth  longitudinal  vein 
is  only  moderately  inflected  ujjon  its  middle. 
Hub.  District  Columbia.     (Osteu-Sacken.) 


4 


32.  D.  nificorilis  Lokw.  %. — Viridis,  humcris  ooucoloritins,  fmten- 
iiis  rulis,  ooulorinii  ciliis  iiiferiorilms  aH>is,  tegnlai'Uiu  ciliis  uigris,  ]hhH- 
liiis  flavis,  articuilo  tarsoruiu  antii.'oruni  ultimo  dilatato,  alaruiu  veiii 
longitudinali  quarta,  non  fracta. 

Green,  includinc  tlie  humeral  callosities  ;  antenna'  red  ;  eilia  of  the  inferior 
orbit  white  ;  cilia  of  the  tefjul/e  black  ;  feet  yellow  ;  last  joint  of  the  fore 
tarsi  enlarged ;  fourth  longitudinal  vein  not  broken.  Long.  corp.  (M9. 
Long.  al.  0.18. 

Syn.  Dolichopus  ruJicoDlis  LoEW,  Neue  Beitr.  VIII,  21,  21. 


:^k- 


^f 


i, 

;  1 


■•■i.N 


64 


IiLl'TKIlV  OF  N<»ItTtI  AiMlilUCA. 


[I'Altr  II. 


(Jrccii,  nitlicr  ^liinintr.  Anti'iiliu!  red  ;  third  ii»iiit  sDiiicwluit 
loti'-'cr  tliiiii  lilt'  two  lii'st  liikfii  tiiu'ctluT,  1)1'  nitlicr  ('(iiiiil  Itrc^idlli; 
ai'istii  distinctly  pnlicsci'iil.  Frcmt  l)fiji'lil  bliii-ii-jiTi-cii.  Ciliii 
of  llio  inl'frior  orltil  wliilisli.  Iliiincri  of  ilic  mimic  c(dnr  as  tlio 
rciiiuiiidcr  (if  llic  iiiipcr  siirl'iicc  ^\\'  the  llinnix.  I'lipci'  side  ul'  tliu 
idtdiimcii  more  ;j;oldcii  urccii  ;  tlic  whitlsli  iiiilM'srciicc  dii  its  sides 
<>(cii|d<'S  inure  s]iiiee  tlinil  lisliiil.  I-iiliiellie  lA'  the  li_viHi|»yj:'iniii  (if 
tlie  (irdiiiiiry  size  tiiid  iMthei'  niiinded  in  sh;i|»e,  white,  uilh  ii  nitlier 
liiirniw  hliick  liDi'der  idmiji'  the  iiiiper  tiiid  iipicid  edjre  ;  the  hitlrf 
jii'j'iicd  and  IVintred  with  lihi<'k  l»rislles.  ('i).\;e  mid  feet  jKile  yel- 
lowish ;  iinteri'ir  side  (if  llie  lore  eoxie  oidy  Milh  u  vei'v  deliciilo 
wiiitish  inil>eseeiiee ;  middle  (•(•xiewilh  si  hhiekish  situt  on  iheii' 
Diitside.  Jlind  feiiioni  with  a  bristle  helore  the  tip  nnd  spiirsely 
ciliiited  \\\\\i  lonu'  yellowish-white  hiiir-  on  the  latter  half  of  their 
under  side.  Jlliid  til)iio  of  ordinary  thickness,  on  llieir  hind  side 
only  with  a  very  short  g'Inhroiis  striiie  near  the  basis.  I'orc  ti'.rsi 
more  than  once  and  a  half  the  lenjith  ol  •  tibia',  slender  ;  li'.e  four 
first  joints  stalk-like,  yellowish  ;  the  two  lirst  joints,  taken  together, 
are  somewhat  lon,L;er  than  the  tibia  ;  the  joints  diniinishiii;:'  in 
len<j,'lli  and  stoiitness  from  the  first  to  \]w  third;  the  fourth  joint 
is  e(|ual  to  abont  one-third  of  the  lenutli  of  the  third  and  i;  only 
sliji'htly  stouter  than  the  latter;  the  lillh  joint  is  black,  as  Ihum-  jis 
the  Ibiirth,  somewhat  flattened  and  bearded  on  its  upper  side  witli 
douse,  somewhat  iiicnmlieiil,  short,  bjjick  hairs.  Winu's  rather 
yellowish-ji'ray,  somewhat  narrowed  near  the  basis;  the  fourth 
loiiuMludinal  vein  not  Iirokeii ;  costa  only  slightly  Ihiekeiied  at  the 
tip  of  the  first  lonuitndinal  vein. 

Jtah.   Middle  Slates.      (Oslen-Sackeii.) 

Ob!<i')'rnlion. — If  in  (letcrnuninu'  a  female  speeinuMi,  this  si)0('lcs 
is  hit  upou,  and  if  its  winus,  instead  of  beinji'  yellowish  jiray,  ai'c 
distinctly  ii'ray,  then  it  will  be  necessary  to  compare  wlail  has 
beou  said  about  such  females  iu  the  observation  to  the  twenty- 
first  species. 

6.  Humeral  callosity  yellowish. 

33.  n.  HCapillai'ia  Loew.  %  ami  9.-— Viriilis,  humeris  flavis,  facie 
albida,  antennis  rufis,  ocnloruiii  ciliis  iutcriorilius  albidis,  ciliis  tegula- 
rura  iiigris,  pedibus  flavis,  tarsis  maris  siinplieibus,  alarum  venil  longi- 
tudinali  quartd,  uon  fracta,. 

Green  with  yellowish  humeri ;   face  wiiitish ;  autenn.i?  red ;  cilia  of  the 


^ii 


\'K 


DoLirii(»rta. 


05 


t.*; 


Jnfuridr  orl>it  whitiHli ;  clliu  f  tin-  tt-^'ul.T  Mack ;  fcot  ynll(iw  ;  larni  of 
tlitt  })  |>liiin;  foiirtli  longitiiiliiiiil  vein  not  broken.  Lutig.  curp.  O.'iO— 
o.'Jt;.     J.ong.  111.  O.a.l— (i.2t). 

FvN.  iJnlirliopiia  srnjiitliiris  LoEW,  Neun  Ht'itr.  VIII,  'JiJ,  22. 

IJrij^lit-jrn'cii  (ir  bluish-;:  iimmi,  tlic  alHliiincii  iikM'i'  piM<'U-ur('»'ii, 
t'spi'ciuU}'  towards  its  tip,  sninctinics  niflicrcopiicry.  Kikt  wliitisli. 
ill  tliL'  (^  jrt'iicrally  sitmcwliat  yellow  isli  upon  the  ii(i]M'r  linif. 
Fi'oiit  ;4iiiiiii>r,  ffciicrally  Itliiisli-jrrt'cii,  seldom  frreen  or  hliic 
Aiilciiiiii'  ye!lo\visli-red  ;  lliini  Joint  sliort-<tvale  ;  ^ciienilly  >liti-litiy 
iiiruseated  nt  tlit;  tip;  arista  distinctly  pulteseent.  Cilia  ot  tlie 
inferior  orhit  yellowish-white,  llnnieral  callosity  yellowish.  The 
callosity  hetweeii  the  root  of  the  winjr  and  the  scutellmii  and 
oenerally  also  the  iiiaiyin  of  the  latter  are  of  the  same  color. 
Co.Xii;  and  feet  )»ale  yellowish  ;  the  front  side  of  the  fore  coxa-  is 
liesot  with  delicate  whitish  hairs;  there  are  some  short  niinnto 
Itlack  hairs  on  their  inner  side  only,  which  however  are  not  always 
easily  (lisceriiil)le  in  the  ^.  Middle  c((.\ie  upon  ilieir  ontside  with 
an  elon|iiited  Idackish  spot.  Hind  femora  witli  a  liristle  iicfore 
the  ti)).  The  two  last  Joints  of  the  fore  tarsi  of  the  ?  are  hlack- 
ish-l)i"owii,  still  the  brown  color  often  liejxiiis  already  liefore  the  ti]» 
of  th(!  third  Joint  and  the  tips  of  the  lirst  and  second  Joints  are 
also  (tften  somewhat  infiiscated ;  in  jiale-colored  specimens  the 
■foloriiif;  of  the  middle  and  hind  tarsi  is  the  same,  whilst  in  darker 
ones  the  distinct  lirowii  color  heuins  already  fii  the  middle  of  the 
first  Joint,  ("ilia  of  the  tejiuhe  black.  Wintrs  frrayish,  towards 
the  fore  mai'frin  somewhat  yellowish-lirown  ;  fourth  loinritndinal 
vein  not  broken,  still  the  inferior  anjrle  of  the  flexure  is  some- 
limes  not  rounded. 

Mnlc.  Lamellit'  of  the  liypojjyfrimn  of  moderate  size,  rather 
rounded,  on  the  ujtper  and  ajdcal  mar^nn  with  a  rather  broad  l)lack 
border,  on  the  latter  Jairjred  and  frinured  with  black  bristles.  Hind 
femora  njion  the  second  half  of  their  under  side  ciliated  with 
moderately  lon^  yellowish  hairs.  Hind  tibia>  of  the  usual  thick- 
ness, upon  the  hind  side  with  a  jrlabrous  strijie,  which  reaches 
nearly  to  their  mi(Ulle.  Fore  tarsi  somewhat  over  once  and  a  quarter 
the  length  of  the  tibiii;,  their  joints  decreasiufi-  in  length,  the  last 
one  somowliat  more  pale  at  the  tip.  Costa  near  the  ti])  of  the 
first  lonjritudinal  vein  w'lh  a  very  slight  swelling. 

Hah. — Middle  States;  I)istri<-t  Columbia  (in  June;  Osteu- 
Sacken);   Illinois. 


• 

-.t: 

'' 

''.!    ■ 

l!        1 


n 


lA  I 


V'W  V 


66 


MI'TKllA  of  NdllTH  AMK.IHr.i. 


[I'AllT  If. 


i|    'I'" 


^1' 


■Kl 


31.  D.  flinditor  Lokw.  %  nixl  9.  Viridir^,  linmi>i-i!4  fltiviM,  f.KMM 
nlliiila,  aiiti-niiiti  mils,  ciliiH  (iciiloriitii  iiit'4'rioriliiis  alliiilis,  tri(iilanitn 
ciliin  niiiris,  |)iMlilius  tl.ivJH,  tarHorniii  aiitii'nniin  ailiiiiliH  iliiolms  iiltimig 
ill  iiiaru  ililatatis,  nlariiiii  veiiil  lon^'ituilinali  quartd  iion  Iruutil. 

(irt'tin,  witli  yellowish  limncri  ;  faiM>  whitish  ;  niit«Miii(B  n"\  ;  cilia  of  th« 
iiifcrinr  oi'liit,  wliitish  ;  iMJia  of  tli«  tfuula' Mack  ;  IVi-t  yi'llcnv,  tliti  twi> 
last  joints  of  the  fore  tarsi  of  tlm  ^  t-iilar^cd  ;  fourth  loiigitutliiuil  veiu 
not  hrokon.     Long.  lorp.  (l.2'i.     Loiii{.  al.  i).2'i. 

Syn.   />ii/lrliojiiis  /iiiK/ilur  LoEW,  Neue  lU-itr.  VIII,  22,  23. 

IJri^lil  jrrccii  (ir  hliic-^rccn,  the  !iIh|(»iii('Ii  more  jroldcn-jiTccii, 
especially  townnls  its  end,  soim'tiiiics  nit  her  cn|t|iery.  Fiice 
whitisli,  in  the  ^  frcncriilly  s(»ni<'\vhat  ycllowisii  upon  tiic  iippci' 
hair.  Fr<»iit  shiniiijr,  generally  Idnc-^iTccn,  seldom  blue  or  jireen. 
AiitehMii'  yellowisii-red  ;  third  Joint  short-ovate,  jiciierally  slijihtly 
inl'iisealed  at  tlie  tip;  arista  witli  a  distinct  |)iil)eseenee.  ("ilia  ol 
the  iid'erior  orl>it  yellowisii-white.  ilinnera!  caHosity  yellowisli. 
Tlie  oullosity  l)t't\veen  tlie  root  of  the  winji;  and  tlio  scntelluni  is 
usually  of  the  same  vuUn'  and  ^-enerally  also  tlio  iiuiririn  of  the 
latter.  Coxie  and  feet  ]»ale  yellowish  ;  the  front  side  uf  tlie  foro 
coxiL'  beset  with  de!i<'ale  white  hairs;  on  their  inner  side  there 
are  also  some  short  black  hairs,  which  liowevor  arc  md  always 
distinct  in  the  ^.  Middle  eoxu'  with  an  elonpitcd  blackish  spot 
uixni  their  oufsi(h>.  Hind  femora  with  u  bristle  before  the  tip; 
two  last  joints  of  the  fore  tarsi  black-brown  in  the  9,  still  this 
brown  color  often  bejrins  before  the  tip  of  the  third  joint  and  the 
tip  of  the  lirst  ami  second  joint  also  are  nsnally  sonn'what  infns- 
tated  ;  pale  colored  specimens  have  the  same  eolorino^  on  the 
middle  and  hind  tarsi,  whilst  in  darker  specimens  a  distiinit  infus- 
catioii  already  bejrins  in  the  middle  of  the  lirst  joint.  Win<rs 
frrayish,  somewhat  more  yellowish-brown  towards  the  fore  marjiin  ; 
fourth  long'itudinal  vein  not  broken. 

Mdli'.  Lainelhe  of  the  hyi)oi»y<riuiu  of  medium  size,  rather 
rounded,  white,  on  the  upper  ami  apieal  nuiri>'in  with  a  narrow  black 
border,  on  the  latter  ja^''<red  and  frinjred  with  blaek  bristles.  Hind 
femora  ui)on  the  second  half  of  the  under  side  ciliated  with  not 
very  lonjz;  yellowish  hairs.  Hind  tibia;  somewhat  more  slender 
than  in  the  J*  of  the  ])revious  species,  uixui  their  hind  side  with 
a  jrlabrous  strijie  extendiiifr  beyond  their  middle.  Fore  tarsi  once 
and  a  quarter  the  leng:th  of  the  tibiie ;  the  three  first  joints  of 
moderate  size  and  of  deereasiiig  lenjrth  ;    fourth  joint  flattened, 


iJi'; 


DOMrnniMS. 


6t 


black,  oil  its  upper  fil^ic  IVinjird  with  cldsc  Ithu'k  hairs;  (he  fifth 
joint  still  iiiuro  lliiltnifd,  ovale,  siiow-wliite,  upon  its  ii|»per  >ii|e 
with  very  short  anil  line  niinnte  snnw-wliite  liiiirs.  'I'lie  eostu  nt, 
the  tip  of  thu  lirst  loiif(itiiilinuI  vein  only  with  an  insi^nilieaiiL 
swelliiif? 

llnh.    Middle  States.      (Osten-Sacken.) 

Oliacrrd/ittti. — Of  this  and  of  the  preeedinir  species  I  ))ossesH 
80  many  sjteciineiis  taken  together  that  I  can  entertain  no  dntiltt 
about  haviii;^  the  9  <'f  both  before  inc.  riifortiinately  I  found  it. 
impossible  as  yet  to  discover  any  reliable  character  to  (listiiiiiiii>!i 
these  females. 

h.  Anteiinnj  black,  nt  the  utmogt  the  greater  part  of  thn  (Irst  joint  n»il. 

35«  D.  rlirysostoillllH  Lokw.  %. — Viriilis,  f.-icit'  niin-il,  .■nitciniis 
liigris,  ciliis  oculoiuiii  iiil'eriorilins  alliidis,  tcgularuia  eiliis  nigtis,  \>i'i[\- 
\)\1A  thivlH,  tnrsis  iiiarLs  siiuplicibus. 

Green;  face  golden-yellow;  niitfim.'p  M.ock  ;  cilia  of  the  iiifciior  oiliit 
wliitisli ;  cilia  of  the  tegul.-e  lilack  ;  ftu-t  ydlcpw  ;  tarsi  of  the  J,  jplaiii. 
Long.  Corp.  ('.18.     Long.  al.  0.17. 

Sy.v.  JJulichii/ius  ckrysimOiiniis  LoKW,  Nene  Beitr.  VIII,  23,  li4. 

(ircon,  .shininfr.  Face  narrow,  dark  udldcii  yellow.  Antenna! 
altofrether  black;  third  joint  cloiifrated-ovate  with  a  pointed  tip; 
arista  rather  slender  with  a  somewhat  iiii])erceptii»le  piii)escence. 
Front  shining  blue-green,  ('ilia  of  the  inferior  orbit  whitish. 
Upper  side  of  the  tliora.x  l)ut  little  dusted  ;  on  ciicli  side,  at  the 
transverse  suture,  with  a  co))pcry-browii  spot.  Abdomen  with 
rather  apparent  dark  incisures,  which,  in  fully  colored  specimens, 
nre  margined  with  co])pery-red.  The  lamella-  of  the  liypnpygiiim 
are  large,  rounded,  yellowish-white,  with  a  not  very  narrow  black 
1)order  on  the  upper  and  the  {ijtical  edges;  the  hitter  is  jagged 
and  fringed  with  black  l)ristles.  Fore  coxai  yellow,  somewhat 
blackened  only  at  the  base,  clothed  anteriorly  with  sliort  black 
hairs,  middle  and  hind  coxie  blackish,  their  extreme  tip  oidy  yel- 
low. Feet  yellow.  The  hind  femora  with  a  bristle  befure  the  tip 
and  with  short  yellowish  hairs  on  the  underside,  iiltlumgh  not 
ciliated  with  them  in  the  true  sense  of  the  word.  Hind  tibia'  not 
stout;  their  posterior  side  without  glabrous  stripe.  Fore  tarsi 
plain,  but  little  longer  than  the  tibiic,  gradually  iiifuscated  towards 
the  tip.  Middle  and  hind  tarsi  infuscatcd  from  the  ti]>  of  the  first 
joint;  however  the  second  and  third  joints  of  the  middle  and  the 


1? 


itt 


47- - 


<'  .   s 


I 


63 


DIPTERA  OF  NORTH  AMERICA. 


[part  II. 


soooncl  joint  of  the  hind  tarsi,  except  its  tip,  are  still  rather  pale. 
'I'ef^uho  with  blaek  cilia.  AViiijis  tiiiLfcd  with  }j;ray  ;  more  brown* 
ish-jrray  along  the  anterior  bonier;  costa  with  a  hardly  perceptible 
thickeidng  at  the  tip  of  the  first  longitudinal  vein  ;  fourth  longi- 
tudinal vein  not  broken. 

Hub.  Washington,  1),  C.     (Ostcn-Sacken.) 


^ 

K 

m 

^p 

^!i 

pf<i 

1 

p 

^^ 

HI 

aft'  »* 

^1* 

Mm 

w«  ' 

c 

fS 

^•s. 

/#.* 

W 

ffila 

isi>'-i 

•J'  ) 

Jil,f 

Sf' * ' 

^   <t 

W    * 

♦        <'^ 

W 

'      V 

h 

s. 

ii 


36.  D.  prSCllstllS  LoKW.  %  . — Aeiieo-viridis,  iiiten?,  facie  ex  ciiierco 
ochraci'il,  anteiini.s  iiigris,  ciliia  oculoniin  iiiferioribus  alhidis,  tcgiiliirum 
ciliis  nigris,  pedibus  testacei.s,  litura,  feiuorum  aiiterioiuiii,  feiuoium 
posticoi'um  apice,  tarsis  anterioribus  iiide  ab  artiuuli  prinii  apice,  tarsia 
posticis  totia  cum  tibiaruiu  posticaruui  apice  nigris,  alarum  ex  ciiiere* 
]iyalinarum  apice  uigro. 

Bronze-green,  sliiniiig ;  fate  grayish  oclire-yellow ;  antennae  black;  cilia 
of  the  inferior  orbit  whitish ;  cilia  of  the  teguhv  l)lack  ;  feet  luteous* 
yellowish  ;  a  stripe  on  the  fore-femora,  the  tip  of  the  liind  femora,  th« 
four  anterior  tarsi  from  the  tip  of  the  first  joint,  and  the  hind  tarsi 
altogetbor,  as  well  as  the  tip  of  the  hind  tibiae,  black;  the  tip  of  the 
grayish-hyaline  wings  black.     Long.  corp.  0.21.     Long.  al.  0.21. 

SvN.   Dolicliopus  ])ricustus  Loew,  Berl.  Kut.  Zeitschr.  VI,  212,  62. 

Bronze-green,  shining.  Face  grayish-yellow.  Antennic  alto- 
gether black;  their  third  joint  shor^  Front  metallic  green,  some- 
what dusted  and  therefore  but  little  shining.  Occipital  bristles 
very  long.  Cilia  of  the  inferior  orbit  whitish.  Last  segments  of 
the  abdomen  generally  somewhat  colored  with  coppery.  LamelliE 
of  the  hypopygium  of  medium  size  only,  broad,  with  very  rounded 
upper  border,  white,  bordered  with  black,  bristly  along  the  upper 
M\(\  apical  edge ;  the  latter  somewhat  jagged.  Coxa;  blackish, 
their  tip  brownish-yellow  ;  the  fore  coxix;  with  a  grayish-white  dust 
and  hairy  with  black.  Feet  brownish-yellow  ;  the  fore  femora  on 
the  under  side  with  a  brownish-black  longitudinal  stripe;  the  hind 
femora  before  the  tip  with  a  blaek  bristle  and  tinged  with  black 
on  the  upper  side  of  the  tip  ;  the  delicate  hairs  on  their  under  side 
are  somewhat  longer  than  in  many  other  species,  although  they 
cannot  be  called  cilia.  The  hind  tibiie  are  blackened  towards 
the  tip,  and  have,  towards  the  end  of  the  upper  side,  a  rather  dis- 
tinct dimple  or  impression ;  their  hind  side  has  no  glabrous  stripe. 
Tarsi  [)lain,  the  four  anterior  ones  fro)n  the  tip  of  the  first  joint, 
the  two  hind  ones  altogether  black.  Cilia  of  the  teguhe  black. 
"Wings  grayish  hyaline,  the  extreme  tip  of  the  wing  black;  the 


rOLICIKH'US.  69 

llilrd  loiiffitiuliiial  vein  is  soiiicwliat  directed  l)iu'kw:irds  towards 
its  end,  so  tliut  its  ti}»  is  ir'ui'ci'  to  the  tip  of  tlic  fourth  vein  tiiiiii 
is  usual  iu  otlior  spoeics  ;  tin;  last  portion  of  tlic  foiirtli  loiijiiludi- 
iial  vein  is  almost  straifiiit  ;  on  tlii'  spot  wiuif  its  usual  lleMirc  is 
situated,  tlie  surface  of  llic  winji'  is  distinctly  convex;  costa  but 
indistinctly  thickened  at  the  tij)  of  the  first  lonji-itndinal  vein. 

J{(ih.    Illiiiois  ;   ( |,e  IJaion.) 

Ohffcri-dtiini. — It  is  to  ho  presuiiu'd,  judji'iiijf  from  the  onalouy 
of  similar  Kuropean  species,  that  tlio  J  <»f  D.  j)r!iuslu6  has  no 
black  spot  at  the  tip  of  the  vvinjf. 

31.  I>.  roinatllH  Loew.  %  ami  9- — Viiidis,  facie  Candida,  anttMuiis 
iiiirris,  ciliis  oculorina  iiil'crinrilnis  aliiis,  tegulaium  ciliis  iiigris,  pcdilaid 
flavis,  fentoi'um  postieorum  apiue  superne  nigro,  alarum  vena  l<inf.'ltu- 
dinali  (luarta  iion  frautil. 

(ireen,  face  snow-white,  antennre  lilack;  cilia  of  tlie  inferior  orbit  wliite; 
cilia  of  the  tegula'  Mack  ;  feet  yellow,  the  tip  of  the  hind  femora  hlack 
above;  tlie  fourth  longitndiual  vein  of  tlie  wings  not  broken.  Long. 
Corp.  0.17.     Long.  al.  (>.1(J. 

Syn.  DuUchojuts  comiiliis  Lofav,  Nene  Beitr.  VIII,  23,  25. 

(ireoii  or  brouzo-frrcen,  shiniiifr.  Face  suow-wliite,  tliat,  of  the 
9  rather  broad.  AuteiiniP  altofreiher  black,  the  third  joint  short- 
ovate  ;  arista  with  au  ahn(»st  iinperce])tible  puliesceuce  ;  cilia  of 
the  iid'erior  orl'it  white.  Front  shiuin<r  frreen.  Abdonu'u  with 
distinct  dark  incisures.  Fore  co.\a3  yellow,  blackened  only  at  their 
very  base;  in  the  %  their  in-ier  side  and  their  tip  only,  in  the  9 
almost  the  whole  anterior  side  is  beset  with  small  l)lackisli  hairs. 
Middle  and  liind  coxi\;  blackish,  their  very  tip  only  yellow.  Feet 
ye'low  ;  the  hind  c<ixie  with  a  bristle  before  the  ti})  and  tiiifred 
with  brownish-black  on  the  upper  side  of  their  tip.  Hind  tibia; 
slender,  their  tip  l)lack.  Fore  and  middle  tarsi  black  from  the  tip 
of  the  first  Joint;  hind  tarsi  altojretlier  iilack.  Cilia  of  the  tesruhu 
black.  Wing-s  tinjred  with  >rray ;  fourth  loufi'itudinal  vein  nut 
broken. 

Mdh-.  Lamelhe  of  the  hy])opyLHum  hardly  medinm-sized,  ovato, 
whitish,  on  their  apical  e(l;fe  witli  a  vestijre  only  of  a  narrow  black 
border  and  very  little  ja<r,>red,  ciliated  with  hairs.  nio<t  nf  which  are 
l>ale.  liiml  tibia*  uu  their  hin<l  side  without  any  bare  stripe. 
First  joint  of  the  fore  tarsi  a  litth'  hui^'er  than  the  four  followiii}^ 
ones  taken  together;  the  latter  are  deej»  black  auil  >omewlia^t  liat- 


7^ 


.^lifl 


TO 


DIPTEUA  OF  XOKTII  AMERICA. 


[part  II. 


ti'ut'd.  The  bristles  on  tlicuiti»er  side  of  the  miiUllo  til)iio  are  very 
l)r()h)ii<r('(l  and  Ix'conie  very  slender  towards  their  ti|».  'I'lie  lirst 
joint  of  tlie  nuddle  tarsi  is  of  eonsiderable  lenji'tii,  ciliatt'd  on  its 
ujiper  side  with  aliout  nine  or  ten  very  lonj?,  bristle-like  black  hairs. 
Jl(t!>.  I'ennsylvania ;  Maryland ;  District  Coluniljia.  (Osteu- 
Saeken.) 


„  ..   .,1; 


3H.  IJ.  seoiiarill<4,  iiov.  sp.  %, — Viridis,  facie  en  idida,  antennis 
niu'lis,  articiilo  piiuio  infra  rulo,  ciliis  oeuloniiii  inleiioribus  j)alli(li.s,eiliis 
tegulaium  nigiis,  iti'dibus  tlavis,  taisis  t-x  parte  iiit,'ris,  aiticulis  antico- 
ruiii  iiltiiiiis  duohus  siibdilatatis  ft  utilinjuu  nigio-pcmiatis,  veua  ala- 
ruui  Idngittidinali  (^uarta  nou  liauta. 

(ireen,  face  siiow-wlnte.  antenna?  Mack,  the  first  joint  upon  tlie  under  side 
red;  cilia  of  tlie  inferior  orbit  pale;  cilia  of  tlie  tegulic  black;  feet  _yei- 
low,  tarsi  partly  black  ;  two  last  joints  of  tlie  fore  tarsi  soniewliat  thick- 
ene<l,  feathered  with  black  on  both  sides;  the  fourth  longitudinal  veiu 
of  the  wings  not  broken.      Long.  corp.  O.li-i.     Long.  al.  0.24. 

I5rifi'ht  nietailie  g-reen.  Antennte  black,  '.he  lower  edji'e  of  tho 
first  Joint  red  ;  third  joint  short.  Face  snow-wliiti;;  ;talpi  bnjwn- 
ish-yellow,  the  basis  black.  Cilia  of  the  inferior  orl)it  yellowish. 
Front  metallic  ji'reen.  Fore  eoxie  yellow,  tdacl-ened  at  the  baso 
only  to  a  moderate  extent,  upon  the  front  sidv  v  ,li  a  black  pubes- 
veiiee.  .Middle  and  hind  coxa'  blackish,  oidy  llu;  extreme  tip  and 
the  trochanter  yellow.  Feet  yellow.  Hind  femora  before  the  tip 
with  a  bristle.  Tibiie  i>lain,  with  rather  numerous  black  bristles; 
hiiul  tibia3  at  the  ti[)  not  blackeiu'd,  upon  the  liind  side  without 
glabrous  spot.  Fore  tarsi  from  the  tii>  of  the  third  joint  black, 
not  (juite  ouce  and  a  half  the  len<>'(h  of  the  tibia-;  their  two  lust 
joints  are  oidy  very  sliji'htly  enlarged,  but  closely  feathered  with 
bristle-like  nunutc  i)lack  hairs  upon  the  front  and  hind  side,  so  that 
they  seem  to  be  rather  l»road.  Middle  and  hind  tarsi  plain,  from 
the  tip  of  the  first  joint  black;  uixtn  the  up|»er  side  of  the  lirst 
joint  of  the  middle  tarsi,  not  far  from  the  tip,  thei'e  is  a  stoiit  black 
bristle.  Cilia  of  the  tcgula;  black.  Wings  grayish-hyaline,  of 
the  usual  form;  fourth  longitudinal  vein  not  broken  and  the  fore 
margin,  near  the  tip  of  tin;  first  longitudinal  vein,  not  thickeneil. 
The  lanuilhe  of  the  hypopygium  of  the  only  specimen  which  I 
possess  are  almost  destroyed;  1  a:u  able  to  state  uiily  that  they 
4H'e  yellowish. 

iM\  jMaine.     (Packard.)     Mass.     (Sanborn.) 


DOLICIIOPUS. 


tl 


39.  D.  diHC-ifer  Ptann.  %  and  9. — Viriilis,  facit*  allia,  aiitoniiis  ui- 
gri.s,  uiliis  (xniloruin  iiiferi()ril>urt  alliis,  te^'uhiiiuii  ciliis  nigris,  peiUbud 
flavis,  t'eiiioriiiii  po.stiuorum  apiue  coiiuolore,  tarnoruiii  aiiticoriim  articulo 
ultiiuo  iiii^io,  ill  iiiare  modiue  dilatato,  alarum  veua  lougitudinali  (juarti 
uon  I'ractii. 

Green;  face  white,  anteunne  black;  cilia  of  tho  inferior  orbit  white,  cilia 
of  the  teguhe  hlack  ;  feet  yellow,  tip  of  the  hind  femora  not  blarkened; 
the  last  joint  of  tiie  fore  tarsi  bhick,  in  the  ^  nioilerately  enlarged; 
fourth  longitudinal  vein  of  the  wings  not  broken.  Long.  corp.  0.25 — 
0.2tJ.     Long.  al.  (l.-.:4. 

Syn.   Dolirhojms  iKih/liiliis  Mkiokn',  Syst.  Pesclir.  IV,  86,  22. 
Do/irli(i])iis  (liscifcr  iSi'A.NXii's,  Isis  IH/Sl,  .'J7,  10. 
L>ulirliu/nis  roiij'usiia  ZlcTrKKSTKliT,  Ills.  L.ipp.,  TdJ),  7. 
DollchoiiiiH  i>nli-//iiliis  Stakoku,  Kroyei's  Tidskr.  IV,  21,  12. 
JUulichojJus  discij'er  Zkttkhstimit,  I)ipt.  i>cand.,  II,  .'>33,  28. 

Walkhk,  Kipt.  Brit.  I,  lii:},  20. 
Dolichopus  tanypus  LoEw,  JS'eue  15eitr.  Vlll,  24,  20'. 

Bright  grocii.  P'iico  wliito,  in  the  %  upon  tlio  iqipor  half  irciio- 
rally  more  yellowish-white.  AiiteniuB  black  ;  first  joint  upon  the 
under  si(h'  red,  third  joint  elongated-ovate,  ratlier  large;  arista 
with  a  very  short,  Iiiit  distinct  jiiihescenee;  it  is  inserted  heyond 
the  middle  of  the  third  joint.  Front  shining  green.  Cilia  of  the 
inferior  oriiit  white.  Fore  co.xa;  yellowish,  liesct  n]ion  their  front 
.side  with  (k'licate  wiiite  haii's,  and  only  on  the  inner  side  in  tln^  9 
with  soiue  black  hairs.  Middle  and  hind  cox;e  blackish,  at  the 
tij)  yellowish.  F'eet  yellowish;  hind  femora  with  a  bristle  before 
the  tip.  Hind  tibiie  somewhat  brownish-black  only  at  their  ex- 
treme tip,  particularly  on  the  inner  side.  Fore  tarsi,  although 
darker  from  the  tij)  of  the  first  joint,  but  only  the  last  joint  iihick; 
middle  tarsi  from  the  tiji  of  the  first  joint  lilack;  hind  tarsi  en- 
tirely black,  seldom  oidy  lirown  at  the  base  of  the  first  joint. 
Cilia  of  the  leguhv  black.  Wings  grayish  hyaline;  fourth  longi- 
tmlinal  vein  not  liroken,  towards  its  end  soiuewhat  more  eonverginjj 
with  tli(!  third  than  in  most  of  the  other  siiecies. 


Mali'.      Lamelke  of  the  livitoiivirium  not  verv  lar 


U'C,    ( 


lonijated 


ovate,  white,  on  the  u])per  and  apical  margin  with  a  very  narrow 
lilack  border,  on  the  latter  somewhat  jagged  ami  fringed  with 
black  bristles.  ][ind  fennira  not  ciliated.  Hind  tiliia'  slender, 
"ivithoiit  glabrous  sjiot  upon  their  hind  side.  Fore;  tarsi  exceed- 
ingly slender  and  eloiigateil,  the  four  first  joints  yellow,  still  sonu'- 
what  darker  beyond  the  tip  of  the  first  joint,  each  following  joint 


i\ 


t  , 


••■'jii, 


m 


t 

■}n 


72 


DIPTEHA  OF  NORTH  AMKHi'CA. 


[part  If. 


more  slender  tl'un  the  previous  one;  tlio  first  joint  is  ecjual  to 
tliree-fourtlis  of  tlie  tibia,  and  is  soniewliut  longer  tlian  tiie  second 
atid  third  taken  together;  seeond  till  I'uurth  joints  l)ut  very  little 
de;'reasing  in  lengtli ;  Hfth  joint  deep  blaek,  somewhat  flattened, 
so  that  it  appears  like  a  snuill  ovate  disk;  at  its  extreme  l)asis  it 
is  (Kjlored  with  yellowish-white.  Wings  towards  the  basis  rather 
narrow,  tlumgh  of  the  usual  form.  Costa  near  the  tip  of  the  lirst 
longitudinal  vein  with  an  almost  imjjereeptible  swelling. 

Hub.  English  River;  lied  River.  (Kennieott.)  Silka.  (Sahl- 
berg. )     White  Mountains,  N.  H.     (Osten-Sacken.) 

Observation. — A  very  elose  examination  renders  it  certain  that 
this  species,  as  it  appears  widely  s])read  in  North  America,  is 
identical  with  the  Euroi)ean  D.  dit^cifer.  I  had  overlooked  this 
identity,  while  describing  it  from  American  specimens,  as  d). 
tan  1/ pus. 


!l 


.■■'* 


■ .  f 


i,».' 


40.  D.  lobatlis  Lof.w.  %  . — Virirlis,  facie  dilute  lutescente,  antennis 
iiigris,  iiiferioribus  oculoruui  ciliis  Havicaiitibus,  tegularum  ciliis  iiigris, 
pedibus  Havis,  femorum  posticoruin  apice  concolore,  tarsis  antitis  inde 
al)  artiuuli  primi  apiue  iiigricaiitibus,  articulo  ultimo  nigro,  in  mare  lutis- 
simo. 

Green;  face  pale  luteous-yellow ;  antennse  black;  cilip  of  the  inferior 
orbit  yellowish,  cilia  of  the  tegular  blaek;  feet  yelbw,  the  tip  of  the 
hind  femora  not  darker  ;  fore  tarsi  from  the  tip  of  tlu^  first  joint  black- 
ish ;  the  last  joint  black,  very  much  enlarged  in  the  "J, .  Long.  corp. 
0.27.     Long.  al.  0.2G. 

Syn.  Dolichopns  lobatuK  LoEW,  Nene  Beitr.  VIII,  24,  27. 

Bright  green.  Face  pale  yellow,  rather  whitish  below.  An- 
tenna; black,  first  joint  red  with  blackish  u])per  edge ;  third  joint 
short-ovate.  Front  shiiung,  green.  Cilia  of  the  inferior  orbit 
yellowish.  Lamelke  of  the  hypopygium  rather  large,  ovate,  white, 
on  the  second  half  of  the  njjper  margin  and  on  the  apical  margin 
with  a  rather  broad  l)lack  border,  jagged  on  the  latter  and  beset 
with  black  bristles.  Fore  coxa?  yellow,  upon  the  front  side  with 
minute  yellowish  liairs,  oidy  on  their  inner  side  also  with  a  few 
minute  black  hairs.  Middle  and  hind  coxjc  blackish,  at  the  tip 
yellow.  Feet  yellow.  Hind  femora  not  ciliated  ;  before  the  tij* 
with  a  bristle.  Hind  tibite  somewhat  thickened  al)out  the  middle, 
and  colored  with  darker  yellow  upon  their  second  half;  th'dr  iiind 
side  without  glabrous  stripe.     Fore  tarsi  hardly  once  U5;d  .i  i.olt' 


L^^';,     *'til4_ 


I  ; 


'I 


DOLICHOPLS. 


IS 


the  longtli  of  the  tibiaj ;  tliroe  first  joints  stalk-like  and  very  slen- 
der; from  the  tip  of  tlie  first  joint  hlack-brown ;  lirst  joint  sonie- 
wluit  longer  tlian  tiie  second  and  tliinl  taken  tojtetlier ;  the  tliird 
only  lialf  as  lonji;  as  the  second;  fourth  joint  very  short,  somewhat 
broader  than  the  i)revious  one,  hrownish-hiaek ;  filth  joint  black, 
nearly  as  long  as  the  second,  flattened,  very  much  enlarged,  so 
that  it  has  an  almost  semi-obcordate  shape ;  the  close  l)lack  jjultes- 
cenee  of  its  upjjcr  edge  makes  it  a])})ear  still  larger  and  broader. 
Middle  tarsi  from  the  tij)  of  the  second  joint  bliick.  Hind  tarsi 
entirely  black.  Wings  gray,  towards  the  fore  margin  more  gray- 
ish-brown, narrow ;  towards  the  base  the  hind  margin  has  two 
very  remarkable  sinuses,  a  longer  one  between  the  fifth  and  sixth 
longitudinal  veins,  and  a  shorter  one  behind  the  sixth  longitudinal 
vein,  so  that  there  is  a  lobe  between  them ;  the  anal  angle  of  the 
wing  also  projects  considerably  as  a  rounded  lobe;  the  fourth  lon- 
gitudinal vein  only  with  a  slight  flexure,  somewhat  more  converg- 
ing towards  its  end  with  the  third  than  is  the  case  in  the  related 
species;  the  costa  at  the  tip  of  the  first  longitudinal  vein  with 
a  rather  impercei)tible  swelling. 

Hab.  Englisii  lliver.  (Ketiiucott.) 
.  Observalion. — 1  believe  1  know  also  the  9  of  this  species.  It 
differs  from  the  9  of  I),  disrifer,  by  its  somewhat  larger  size,  its 
somewhat  more  yellowish  face,  and  by  the  fore  tarsi  being  not  only 
shorter,  but  also  tinged  with  black  already  from  the  tij)  of  the  first 
joint.  The  fore  coxie  have,  upon  the  greater  part  of  their  anterior 
side,  some  minute  l>lack  hairs.  Although  the  fore  coxte  of  the  9 
have  in  many  species  a  more  extended  black  pubescence  than  the 
J*,  the  difierence  between  this  9  and  the  above  described  ^^  is 
more  striking  than  usual.  This  circumstance  will  render  it  some- 
what doubtful  that  the  two  sexes  really  belong  together,  until  a 
positive  observation  settles  the  (piestion. 

41.  D.  setosus  Loew.  %  . — Viriilis,  nitidu.'?,  facie  pt  inferiorilms  ocu- 
lorum  ciliis  allii.s,  antenuis  tt-uularuiiuine  ciliis  nigris,  joxis  aiiticis 
pedibusque  flavis,  tarsis  anteiioril)Urt  inde  al)  aiticuli  priaii  apiece  tar- 
sisque  po.sticis  totis  cum  tibiarniri  posticaruni  ajMce  nigris  ;  femora  pos- 
tica  pilis  flavis  ciliata;  tiln.-e  postiuiB  setis  loiigis  armatie,  alarum  veiia 
lougitudinalis  quarta  iioii  fracta. 

Grenti,  shining;  the  face  and  the  cilia  of  the  inferior  orbit  white;  the 
antennae  and  the  cilia  of  the  tcpuliB  black;  fore  coxa»  and  feet  yellow, 
the  four  aDtorior  tarsi  from  the  tip  of  the  first  joint  and  tlie  wliole  hind 


14 


DIPTERA  OF  NORTH  AMKRTCA. 


[I'AllT  II. 


':A 


i 


onos,  including  the  tip  of  the  hind  tibiae  black  ;  liind  femora  ciliated 
with  yellowish  liairs ;  hind  tibi«;  armed  with  long  bristles;  fourtli 
longitudinal  vein  of  the  wings  not  broken.  Long.  corp.  0.23 — U.24. 
Lung.  al.  0.125. 

Sy.n.  DoltchopuK  silosus  Loew,  Berl.  Knt.  Zeitschr.  VI,  213,  63. 

(iroon,  Hliiiiiiifr.  The  narrow  fnco  wliito.  Antciuuu  bltu-k,  tlie 
lower  edge  of  tlie  first  joint  hrowiiisli;  tliinl  joint  ovale,  nut 
rounded  at  the  tip.  Front  ratiicr  dark  <>'reen,  hut  little  shiniii<f. 
("ilia  of  the  inferior  orbit  whitish.  Lainelhe  of  the  liy))opyginni 
of  inediuni  size,  broad,  rather  rounded,  white  with  narrow  border, 
fringed  on  the  upper  and  ajtical  margin  with  l)lack  I)risties,  tho 
latter  but  little  jagged.  Fore  coxiK  pale  yellowish,  dusted  with 
white;  their  short  jjultescenee  near  the  tip  and  upon  the  inner 
half  of  their  front  side  lilack.  Middle  and  hind  eoxio  blacki'!., 
with  pale  yellowish  tij).  Feet  pale  yellowish  ;  the  hind  femora  iiave 
but  one  bristle  before  the  tij)  and  an;  ciliated  wiih  long  yellowish 
hairs  upon  the  under  side;  the  iiiml  tiliia;  are  bJaek  at  the  (ij)  and 
have  upon  their  upper,  as  well  as  upon  their  under  side,  longer 
bristles  than  usual ;  J  am  not  able  to  distinguish  a  glabrous  spot 
ui)on  their  hind  side,  but  at  the  tip  of  the  upper  side  there  is  a 
nhort  pale  line.  Fore  and  nuddle  tarsi  from  the  tip  of  the  first 
ioint,  hind  tarsi  eutirelv,  l)laek.  Wings  a'ravish  hvaline  ;  eosta  at 
the  tip  of  the  first  longitudimil  vein  distinctly,  but  not  strikingly 
thickened;  the  last  section  of  the  fourth  longitudiiml  vein  mode- 
rately iniieeted  upon  its  middle ;  the  hind  transverse  vein  perpeu- 
tiicular. 

JIab.  Massachusetts.     (Le  Baron.) 


Sff-.^'""  ■ 
','11  :..■,■■■ 


4*1.  D.  incisiiralis  Lokw.  %  and  J.— Viridis  vel  aeneo-viridis, 
facie  alba,  antennis  nigris,  ciliis  oculorum  inferioribus  albidis,  tegula- 
runi  ciliis  nigris,  pedil)us  tlavis,  fenioiuni  posticoruni  ai)ice  concolore, 
tarsis  anticis  inde  ab  articuli  prinii  apice  nigris,  in  uiare  simplicil)us, 
alarum  vena  longitudinali  (luarta  non  fracta. 

Green  or  bronze  green  ;  face  white;  antennic  black:  cilia  of  tho  inferior 
ortiit  vvliitish,  cilia  of  the  tegnlai  black,  feet  yellow,  the  tip  of  the  hind 
femora  not  darker;  fore  tarsi  from  tlie  tip  of  the  first  joint  black,  j)lain 
♦■ven  in  the  %  ;  fourth  longitudinal  vein  not  broken.  Ijoug.  corp.  0.17« 
Long.  al.  0.1(5. 

Bv.'*.   l)<)Hiho})u»  inrinuraVis  LoKW,  Nene  Heitr.  YlII,  2,'),  2l?. 

Ui'cco  t>r  bi'yuze  grcto,  wtU  jtifj-crved  sj)t'ciru«nrt  |mrer  gretn, 


:|..., 


GYMNOPTERNUS. 


T5 


sliiniiif^.  FiU'c  wliito.  Aiitcniiiii  l)liick  ;  the  inferior  odjro  of  the 
first  joint  red  or  rcddisii-Urown,  widcli,  iiowever,  is  not  distin'-tly 
j)ereei)til)lo  in  some  spccinicns ;  third  joint  sliort  ;  arista  willi  a 
hardly  perceptible  i)ultisceiice.  Cilia  of  the  iid'erior  oi-liit  white. 
Front  <rr('eii.  Alxlonien  with  remarkably  disliiict  black  incisures. 
Fore  cdXH'  whitish-yellow,  only  at  the  extreme  iiasis  snnn'what 
blackened;  their  front  side  is  beset  npoii  its  i)asal  half  with  nnnier- 
ous  black,  very  delicate  and  rather  sparse  hairs.  Middle  and  hind 
<'oXie  black,  only  at  the  extreme  tij)  sonnnvhat  yellowish.  Feet 
yellowish.  Hind  femora  betbre  the  tip  with  a  bristle.  Fore  and 
middh;  tarsi  blackened  from  tin;  tip  of  the  first  joint  ;  still  the 
whole  lirst  joint  is  also  somewhat  dusky.  Ilind  tiltia-  with  a  l)lack 
tip;  hind  tarsi  entirely  black.  Cilia  of  the  te^-nhe  black.  AVinjrs 
grayish  ;  fourth  long'itndimd  vein  only  with  a  sli<i'ht  flexure  and 
towards  its  end  somewhat  more  than  usually  converninji'  with  the 
third  longitudinal  vein. 

M(iU\  r.anu'lhi!  of  the  hypo])y,irium  of  medium  size  and  of  a 
vounded-ovate  form,  white;  on  the  upper  and  apical  maru'in  with 
a  rather  narrow  black  lK)rder,  on  the  latter  jaji-urd  and  friii<red 
•with  black  bristles  ;  hind  femltra  ciliated  with  moderatt'ly  lonji'  and 
very  delicate  pale  liairs.  Hind  til)ia>  slender,  j)lain,  upon  their 
hind  side  without  fi'laltrous  stripe.  Fore  tarsi  plain,  about  once 
and  a  cpiarter  the  lenu-th  of  the  til)iie;  their  lirst  joint  is  lonji'er 
than  the  two  followin<i\  Jjut  somewhat  shorter  than  tht;  three 
I'ollowiiiji-  taken  tog-ether.  Costa  at  the  tip  of  the  lirst  longitudi- 
nal vein  with  a  very  short  but  distinct  swelling. 

Ilab.   Trenton  Falls,  N.  Y.     (Osten-Sacken.) 


Gen.  III.    WYIWXOPTERXl'S. 

The  fidlowing  characters  of  the  genus  Giimnupternnii  are  to  be 
<il)served :  The  first  joint  of  the  antenniC  is  hairy  upon  the  upper 
side,  the  third  almost  never  remarkal»l_v  elongated;  arista  doisal. 
The  hypopvgium  is  entirely  disengaged,  th(^  exterior  iip])cndag<'S 
sire  lameiliform  and  of  moilerate  size.  The  lirst  joint  of  the  hind 
tarsi  is  shorter  than  the  sccoml  and  not  provided  with  bristles, 
'I'lie  third  and  fourth  longitudinal  veins  of  the  wing>  are  parallel 
«r  almost  so. 

The  last  of  these  characters  is  applicable  to  all  the  \orth  Amc- 
ficao  s;i)ecies  of  iiijiniu>j^»(('fomg  known  to  me.    Ann)n<j  the  species 


f'/' 


76 


PIPTERA  OF  NORTH  A>;KRICA. 


[I'AUT  II. 


'4 
I 


of  the  old  world  which  have  l)eeii  placed  into  the  genus  (ii/)nno/)- 
tiTiiHti  there  certainly  is  a  wliitle  group  of  closely  reliited  species 
the  third  iind  fourth  longitudiiuil  veins  of  which  ilccidedly  (,'on- 
verge.  ]Io\vever,  as  this  group  must  necessarily  he  separated  from 
the  genus  (ii/miwjjIcrniiK,  it  could  not  prevent  nie  from  adopting 
the  piirallelism  of  the  third  and  fourth  longitudinal  veins  as  cha- 
racteristic marks  tA'  (ii/tiinoji/cnius.  I'rccisely  this  character  dis- 
tinguishes in  the  easiest  manner  the  sjjecies  of  O'l/niiioj/liTnuti  from 
those  of  the  following  genera,  which,  like  Cii/ii'noji/crnus,  have 
the  upper  edge  of  the  first  joint  (jf  tiie  antcnuie  hairy,  and  are 
without  bristles  upon  the  first  joint  of  t!ie  hind  tarsi. 

Most  of  the  species  of  (/i/inndji/criitis  are  snuill  and  have  shorter 
antenna',  )mt  a  more  distinctly  jiubescent  arista  than  the  species 
oi  DulichopHH.  They  are  much  i)oorer  in  suita!)le  )thistic  chaiiu'- 
ters  for  the  distinction  of  the  species  than  the  latter.  The  feet 
of  the  nniles  are  very  seldom  ornamented. 

The  color  of  the  cilia  of  the  inferior  orl)it  is  also  of  the  highest 
importance  for  the  determiiuitiou  of  the  species  of  the  present 
genus.  Unfortunately  it  cannot  he  so  easily  ol)served  as  in  the 
sj)ecies  of  iJolichopus.  Its  discriniination  in  some  species,  of 
which  I  have  oiUy  single  specimens,  was  totally  im})ossil)le ;  as  to 
others,  I  often  remained  uncertain.  In  the  former  case  I  liavo 
been  silent  about  their  color,  and  in  the  latter  I  did  not  use  any 
l)ositive  expressions.  Under  these  circumstances  it  was  impossible 
to  use  the  color  of  the  cilia  of  the  lower  orbit  as  a  basis  for  a 
suljdivisiou.  This  is,  however,  but  of  little  moment,  as  the  cilia 
of  the  lower  orbit  seem  to  be  black  in  almost  all  North  American 
species  of  (T/y?7i«ojj/r/v;«.s.  Another  important  mark  for  the  dis- 
tinction of  the  sj»ecies  is  the  hairy  or  glabrous  surface  of  the  scu- 
tellum,  provided  there  is  a  sufficient  number  of  well  preserved 
specimens;  otherwise,  if  the  specimens  are  few  or  not  well  pre- 
served, this  mark  will  be  rather  uncertain.  I  did  not  wish  to 
omit  characters  of  this  kind  altogether,  but  have  to  request  the 
reader  not  to  place  too  much  contidence  in  them,  especially  when 
my  expressions  seem  to  imply  doubt.  The  same  rule  applies  to 
the  form  of  the  lamelhe  of  the  hypopygium.  In  iminy  s|)ecies 
they  have  the  form  of  an  erect  crescent,  fastened  by  its  lower 
point.  This  form  will  only  then  be  recognized,  when  tliey  are  not 
closely  applied  to  the  hyi»opygluin  with  the  concave  side;  if  the 
latter  is  the  case,  then  Ihey  appear  only  as  snndl  lamelhe,  with 


GYMNOPTERNUS. 


n 


rounded  ends,  niid  tlio  letijrtli  of  which  is  jrrontor  tlian  their  hrcadth. 
I  have,  then,  culled  tiieiii  rounded,  witliout  further  remarks  uliout 
tiieir  form  ;  to  [irevcnt  niistal<es,  h(»\vever,  I  must  state  tluit  this 
JipitJics  only  to  tiio  convex  odjirc.  J  iiave  omitted  otlier  eliaraeters 
Jn  tiie  descriptions,  hccausc  they  are  conunon  to  all  North  Ameri- 
can sjiecies  known  to  me;  for  instanci,  the  presence  of  only  one 
liristle  at  the  eml  of  the  hind  femora,  etc. 

This  genus  derives  its  name  (yvuidj  naked,  and  rtrfimj  the  sole) 
from  the  absence  of  In'istles  upon  tiie  first  joint  of  the  hind  tarsi, 
whereliy  it  differs  from  the  genus  Jiulic/iitpii.-i,  \>)  wliich  its  sj)ecies 
fnrmerly  i)elonged. 

The  species  described  liy  Sny  as  Polic/idjiKt^  <>}i.'<fiirii!<  seems  to 
be  a  (ri/)nn(i/ttcnn(.<.  J  do  not  know  (»f  any  other  species  of  NDrtli 
Ar.ieri(.'an  (r[/iii>i(jplrrinis,  descrilu'd  )iy  a  previous  autiior.  This 
undoubtedly  arises  from  the  circuiiistancc!  that  the  species  of  (lipw 
}ti)jt/crnan,  on  account  of  their  small  size  and  their  apparent  insig- 
nificance, liave  been  less  noticed  by  eoHectors.  The  nunjl)er  of 
Sjtccies  known  to  me  sIkjws  that  North  America  is  very  rich  iu 
species  of  this  genus.  To  produce  a  really  satisfactory  treatise 
on  the  subject  would  recpiiri;  much  more  nuiterial  than  that  over 
which  I  could  dispose,  because  the  i)ositive  discrimination  and 
e.vact  delineatiou  of  the  characteristics  of  the  species  ]U"esent  many 
dilliculties. 

I  will  give  now  a  dichotomic  tabic  for  tlie  purpose  of  deter- 
mining the  species,  and  a  synopsis  of  the  .systematic  arrangement. 
As  will  l)e  seen  from  the  latter,  the  Inilk  of  the  species  known 
to  me,  are  very  nearly  rclate(l  and  form  but  a  single  group ; 
whereas  but  a  snuill  numl)er  show  characters  which  isolate  them 
from  the  others. 


■I'M 
■  i'-f 

:  it; 


^{ 


Table  for  the  determinfitioii  of  the  Species, 

Color  non-metallic.  1  flavus  ^.w. 

Color  metallic.  2 

Tliird  joint  of  the  antennw  with  an  elongated  point.  2  subulatua  /.n: 
Third  joint  of  the  antiMiiire  without  elongated  point.  3 

Prevailing  color  of  the  feet  lilaik.  4 

Prevailing  i^olor  of  thf  fcft  yellow.  (J 

Thiril  joint  of  the  antenn.'e  remarkahly  hairy.  3  scotias  /.»: 

Tliird  joint  of  the  anteiiiiie  with  scarcely  perceptihle  hairs.  o 

WliigH  grayi.sli  hyaline.  4  barbatulus  /.»•, 

Wingd  somewhat  tinged  with  blackish.  !i  tristis,  n.  sp. 


IS 


T)irTKnA  OF  NdRTlI  AMKUICA. 


r 


^  (  Tip  (if  flic  liiiid  ft'iiiorn  Mnckinh. 

'  T\\t  (if  tilt'  tiiml  feiiKini  not  blackish. 
^  (  Tlionix  (lark  violet. 

(  Tliorax  not  vioU-t. 
Q  {  Coxa'  up  to  tliii  tip  soniBwliat  liluukiah. 

(  Coxa-  ,vi'll(i«'isli-\vliitc. 

/  !''()r«  coxai  up  to  tlic  tip  Mackish. 


[r.AHT  ir. 

C  exilis  hi: 
I 

8 

() 

7  spectabilis  f.n: 

>^  albiceps  /.»•. 

0  BubdilatatuB  /.ir. 

0  -'  Fore  coxa!  ciitirt'ly  yellow,  or  at  the  utmost  somewhat  iiilusi;att'il  near 

(      tlii^  haHe.  10 

/■  Hind  tarsi  from  tlu'  tip  of  the  first  joint  hlack.       lO  laevigatus  /.»•. 

10^  Hind  tarsi  t'lwards  the  tip  but  Uttlo  dusky,  at  the  utmost   brownish, 

I      never  blauk.  H 

f  AntcnnjB  entirely  black.  12 

H> 
]  1  frequens  /.  »■. 

i;j 
12  lunifer  Lw. 

U 
Interior  appendagea  of  the  hypopygium  ptmicillate. 

13  fimbriatUB  Lu: 

ppendacres  of  the  hypopygium  not  penicillate.  15 

Third  and  fourth  longitudinal  veins  but  slightly  converijing. 

14  despicatus  /.«'. 
Third  and  fourth  longitudinal  veins  altogether  parallel. 

If)  difHcilis  /.(/■. 

f  Middle  and  hind  coxre  from  the  basis  distinctly  blackish,  17 

1()  J.  Middle  and  hind  coxre  yellow,  or,  at   the   >itniost,  the  former  witli  a 

t      grayish  tinge.  II) 

j_  J  Lower  jiart  of  the  face  of  the  9  distinctly  hairy.    1(5  iiigribarbua  f.x: 

^  The  lower  part  of  the  face  not  hairy.  IS 


11- 

<.  Antenna'  partly  red. 

jn/  Lamella'  of  the  hypopygium  l)lack. 

•■  Laiiiellie  of  the  hypopygium  not  black. 
.„  f  Lamella'  of  tln^  hypopygium  dark  yellow, 

I-  Lamelhe  of  the  hypopygium  white. 

{Interior  appendagea  of  the 
Interior  app<'ndages  of  the 

J 


18 


pari 
f  Antennre  small. 
I-  Antenn.-p  of  tolerable  size. 


jq  (  Venter  and  posterior  maruin  of  the  pleura?  not  yellow. 

I  Venter  and  posterior  margin  of  the  jileune  yellow, 
f,.^  5  'I'liorax  brightly  shining,  front  while. 

(  Thorax  rather  dull,  front  gray. 


2^  f  Hypopygium  remarkably  stout  and  large. 

l  Hypopygium  of  the  usual  size  and  thickness, 
ijo  f  Antenna;  very  small. 

I  Antennae  of  middle  size. 


17  parvicornia  Lw. 
Is  opacus  hr, 
110 
21 
10  politllR  f.ir. 
20  debilia  /.»•. 
21  crassicauda  /.ir. 


22  minutus  Lw. 
23  ventralis  Lie. 


Vdf' 


,  f  ■■  *.■  : 


-1 


ill 


OYMNorTKKNrS, 

Fiisfenuitir  tirriunirm'iit  nf  thfl  Specie», 

I.  Coloring  of  tlic  \«><\y  iion-iuotallic. 

1.  flavuB  /.»•. 

II.  Coloring  of  tlm  body  tiM-tallic. 

A.  Tliinl  joint  of  tlif  niitt'iiiiii'  witli  an  clongatt-.l  point. 

'2.  Bubulatus  A'/'. 

B.  Tliinl  iniiit  of  tlin  aiitfiiim'  uitliout  an  t'loiiuati-d  point. 

A.   I'l-fvailimr  color  of  thi'  fet-t  Mack. 


3.  Bcotias  /."'. 

4.  barbatuliis  /.»'. 


tristis,  n.  sp. 


B.  Prevailing  color  of  the  fci't  yi'Uow. 


fi.  exillB  /.". 
7.  apectabilis  A"'. 
6.  albiceps  /.»•. 
!'.  subdilatatus  l.ic. 
In.  laevigatuB  /."■. 

11.  frequenB  /.«•. 

12.  lunifer  A"-. 

i:^.  GmbriatUB  Am. 
14.  debpicatus  Lw, 


1.").  difflcilia  f.<i'. 
I'i.  nigribarbus  Au'. 
17.  parvicornis  Aa". 
1**.  opacuB  At. 
T.».  politus  A»r. 

20.  debilis  /  '■. 

21.  crasBicauda  Litt. 

22.  minutuB  /.": 

23.  ventralis  Aw. 


t9 


I 


V  ■ 


t    * 


I-'- 


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W. 


IMAGE  EVALUATION 
TEST  TARGET  (MT-S) 


y 


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(A 


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I.I 


l^|28     |2.5 
•^   In    III  2.2 

:?  lia  IIIIIM 


1.8 


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L25  IIIIU   IIIIII.6 


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Photographic 

Sciences 

Corporation 


33  WbST  MAIN  STREET 

WEBSTER,  N.Y.  14580 

(716)  872-4503 


^ 


& 


\ 


^ 


"> 


80 


DIPTEUA  OF  NORTH  AMERICA. 


[part  ir. 


:!|, 


DESCRIPTION  OF  THE  SPECIES. 

I.    CoLORlXO  OF  TIIK  HdDY  NON-MKTAI,LlC. 

1.  (a.  flavUH  LoKW.     %  and  9- — Fliivus,  ahduniinis  si'gmeiitia  interme- 
diis  pleriiiiuiUH  viresceiitibiis. 

Yellow ;  the  middle  segments  of  tlie  abdomen  usually  greenidh.      Long, 
coip.  0.1(1—0.11.     Long.  al.  0.12—0.13. 

Sv.N.    (iijmnnplfrnuxjiiiviix  LoKW,  Neiio  Ueltr.  VIII,  28,  1. 

I'ulc  ycllowisli.  Fair  \iiitisli.  Aiitciiiiii'  dark  yollow,  the  third 
Joint  with  a  wry  ixtintci  hrowiiisli  or  l»hu'i<ish  tii*  and  with 
nilhcr  distinct  liairs,  winch  arc  visibly  sliortcr  in  the  female. 
Arista  l»iacl\  with  an  almost  impcrccptihle  imhcsccncc.  Front 
and  (tcciput  of  a  <rrccnisli  cohtr,  Imt  thiciviy  (histcd  witli  yeUow  .so 
as  to  a|>i»car  dull  and  altojrcther  lijjrht  {rrcenish-jrray.  Cilia  of  the 
inferior  orbit  white-yellowish.  Thorax  entirely  yellow,  not  unfrc- 
<|uently  with  a  sliirht  trace  of  a  jrreenish  lustre,  its  Itristles  l)Iack, 
the  .snuill  hairs  pale,  scutellum  provided  witli  two  Mack  Jiristles, 
otherwise  jrlahrous.  Abdomen  with  yellow  hair,  the  stout  liairs 
on  tlie  incisures  somewhat  darker,  but  not  black ;  the  middle  and 
sometimes  also  the  posterior  sefrments  of  the  abdomen  show  a 
frreenish  lustre;  hyi)opyfrinm  yellow,  lamelhe  small,  yellowish- 
white,  without  a  dark  umrfriii,  thinly  ciliated  with  short  yellowish 
hairs.  Feet  white-yellowish,  their  scanty  bristles  black  ;  the 
smaller  lutirs  yellowish.  Cilia  of  the  tejridie  yellow.  Wiupr.s 
towards  the  anterior  nuufrii'  yellowish,  otherwise  more  yellow- 
grayish. 

Hab.  Pennsylvania.    (Osten-Sacken.) 

II.    Coi.OUINCJ  OF  TIIK  noDY  METALLIC. 
A.    lltird  joint  of  the  nntrunfr  in'th  on  rlmif/atfd  pnhit. 

2.  a.  SP.l1»lllatllH  LoKw.      %  .— Viridis,  tliorace  snl.opnco,  antennanim 
arficulo  tertio  acutissimo,  hirto,  setd  subapicali  instnicto. 

Oreen;  thorax  rather  dull,  the  third  joint  of  the  antennie  very  pointed, 


CiYMN01>TKHNlS. 


81 


rnnL'li1\'  hairy,  witli  a  sultnpioal  arista.     Long.,  forp.  0.13 — 0.14.     Long, 
al.  (».li;. 
Syx.    (n/miinjifiriiiis  suhniiit'i^  Lokw,  Ncue  Reitr,  VIII,  20,  2. 


(iri')-ii,  iiiiiiU'  (lul 


|i!UL'  uniy-ltrowiiisli  dust,  (.'specially  upon 


the  tliunix.  Fnct.'  ^rny-wliitisli.  Tliu  first  joint  of  the  ;iiiteimi« 
hliiek-ln'owii,  tlie  second  red,  the  third  dark  brown,  jit  the'  root 
red,  hnnsually  lonjr  and  shar]»ly  jiointed,  and  covered  with  nuich 
lonjicr  liairs  than  is  tlie  case  with  the  other  species  <if  the  i«anie 
jrenus.  The  hhick  arista  has  a  hardly  |)er«'eptii)le  pnl)esccnce, 
is  scarcely  somewhat  loimer  than  the  third  joint  of  the  antenmc, 
and  iri  inserted  abont  its  last  tliird,  so  as  to  l)e  nearer  to  the  tip 
tinui  is  the  case  with  the  other  species.  Front,  in  c(".se(|nenc<i 
of  a  thick  coverinii'  of  diist,  dull  greenish-frray.  The  color  of 
the  cilia  of  tlie  inferior  orl»it  cannot  easily  he  recon-nized,  how- 
ever oidy  the  lowest  of  them  may  possibly  be  of  n  pale  color. 
Thorax  and  scutellnm,  on  account  of  a  thick  coverinjj  of  dust, 
pretty  dull  jrray-jxreen  ;  the  scutelluni  bears,  as  usual,  the  two  black 
bristles,  and  seems  otherwise  to  be  entirely  without  hairs.  Abdo- 
men more  jrreen,  and  brighter  than  the  thorax.  The  black  hy]to- 
]iViiium  rather  stout,  with  small  yellowish  lanu'lhe,  which  are  cili- 
ated on  the  martrin  with  short  l>lack  hairs  and  have  no  dark  edge. 
Interior  appendages  simi)le.  ])rovide(l  with  (Uie  hair  ujtoii  the  u])per 
side  and  with  two  hairs  ujion  the  ]»oint,  before  it  is  bent  down. 
CoXiO  and  feet  i>ale  yellowish,  fore  cox-.e  with  black  hair.  Cilia 
of  the  togidiw  black.  Wings  sonu'what  yellow-gravish,  large  and 
broad,  especially  towards  the  tip;  the  anal  angle  rounded  olf. 
Hah.  Trenton  Falls,  N.  Y.    (Osten  Sacken.) 


-,  '.  !'■ 


(: 


iia|:i.i 


Vi.    TllTUn  JOINT  OF  THK  ANTENN.K  WITHOUT  EI.ONOATET)  1H»IXT. 

A.   Prevail  1)1(1  color  i>f  iJir  fi'ft  }>liu-l\ 

3.  C«.  scot ias  LoF.w.  ^  and  9. — Atro-virens,  peililms  nieris,  troclian- 
tcrilius,  genilius,  tiliiis,  tarsnnitnque  antcrinruni  l)asi  llavifantilnis,  tertio 
antennarnin  articiilo  hirto,  facie  non  iiilosa. 

Ulack-creen,  foot  black  ;  trochanters,  knoos,  tiliiro,  root  oT  the  four  anterior 
tarsi  yellowish,  the  third  joint  of  the  antenna-  routrlily  hairy,  face  not 
hairy.     Long.  corp.  0.13 — 0.14.     Long.  al.  0.14 — O.!."). 

Syx.    (liimnoptvrntis  sculics  Loiow,  Neiie  Beitr.  VHI,  2'J,  3. 

Dark  black-green,  or  almost  metallic  l)lack.     Face  and  front 
gray.     Antcnnio  entirely  black,  the  third  joint  elongated,  ovate, 
6 


■ji,. 


i^ 


wr 


82 


DIl'TERA  OF  NORTH  AMERICA. 


[part  II. 


not  very  In'oad,  pointed  at  llii;  end,  witli  loiifjer  hairs  than  in  most 
of  the  other  si)eeies ;  the  arista  is  inserted  in  its  niichlle  and  has 
a  rather  indistinct  pnbeseenee.  (.'ilia  of  the  inferior  orl)it  bhiok. 
Seuteilum  witii  tiie  usnal  two  bristles;  otherwise  I  cannot  per- 
ceive any  hairs  ui)on  its  snrfaee.  Feet  black.  Trochanter  with 
tiie  e.Ktreme  tip  of  the  lirst  joint  of  the  coxa,  tip  of  the  femora, 
the  tibiie,  and  the  roots  of  the  fonr  anterior  tarsi,  yellowish,  l)nt, 
on  account  of  the  density  of  the  short  black  hairs,  of  pretty  dark 
:ipl»earance.  The  hind  side  of  the  hind  til)iit'  is  clothed  towards 
its  end  with  dense  black  hairs,  so  that  it  ap}»ears  p''''tty  black  ;  the 
root  of  the  hind  tarsi  is  brown.  Cilia  of  the  pale  yellowish  te^nhe 
black.  Ilalteres  yellow-whitish.  Winjrs  {rray-blackish,  a  little 
darker  towards  the  anterior  margin.  The  small  lumellui  of  the 
liy})opygium  are  black. 

JIab.  English  River.     (Kenuicott.) 


4.  ii.  barbatllllis  Lof.w.  %  and  9. — Atro-virens,  pedibus  nigris, 
trochanteribus,  geuibus,  tibiis  (excei)to  tamen  posticarum  apice)  tarso- 
ruiuqiie  anterioruin  basi  tlavicaiitibus,  alis  ex  einereo-hyaliiiis,  iiifera 
faciei  parte  uigro-pilosa. 

Black-green ;  feut  black,  trochanters,  knees,  tibite  (with  the  exception  of 
the  tip  of  the  hind  ones)  and  the  root  of  the  four  anterior  tarsi  .vellowisli, 
wings  grayisli-lijaline,  the  lower  part  of  the  face  with  black  hair.  Long. 
Corp.  0.12.     Long.  al.  0.12—0.13. 

Syx.   GynDioptcrnus  barhatiiliis  LoEW,  ^'eue  Beitr.  VIII,  29,  4. 

Dark  black-green,  face  gray-white,  the  inferior  part  of  it  some- 
what swollen  transversely,  and  with  small  sparse  black  hairs. 
Anteniue  entirely  blue!:,  their  third  joint  broad,  pretty  rounded, 
and  only  with  short,  scarcely  percei)tible  hairs.  Pubescence  of 
the  arista  extremely  short,  hardly  ])erce])tible.  Front  dark  me- 
tallic green;  the  dust  on  its  surface  can  only  be  perceived  in  an 
obli(pie  direction.  Cilia  of  the  inferior  orbit  black.  Besides  the 
usual  two  bristles  upon  the  scutellum,  there  are  a  few  short, 
extremely  slender,  and  therefore  scarcely  perceptible  hairs.  Feet 
black;  the  tip  of  the  first  joint  of  the  coxa;,  the  troclianter,  the 
tip  of  the  femora,  the  tibise,  and  the  root  of  the  four  anterior 
tarsi  yellowish,  the  tip  of  the  hind  tibiie  to  a  moderate  extent 
black.     The  cilia  of  the  yellow  tegulie  black.     Ilalteres  white- 


GYMNorTKllNLS. 


83 


'■1 


yellowish.     Tho  wiiijr.><  tliisky  with  jrniy  ;  tho  sinall  lanu'lhu  of  the 
liy|Ki)tyjriiiiii  l>rowii. 

Jiiilj.   Middle  States.     (Osteii-J^aekeii.) 

t».  <».  tristis,  II.  .<p.  ■J,  and  9- — Atro-virfiis,  pedilmn  nigris,  scnilm.-*, 
tiliiis  t.iisdiiiiiniui'  aiitoriorum  basi  If'staceirt,  tt-rtio  antfiiiiaruiu  artieulo 
niiilo,  alls  I'igricaiitibuB. 

Hlai'k-L'reen ;  feet  black,  kiiefs,  tibi.-p  and  tb<*  ntot  of  tlie  four  I'li^crid.- 
tarsi  browiii.-b-yellow',  tlic  tliird  joint  of  tbo  antcnn.T  bare  ;  wings  l)lack' 
isb.      Loni,'.  I'orp.  0.1:5— 0. !."..     J.ong.  al.  (M-^- O.!,"). 

KfScMiMc-  iiiiich  intt  (tnly  tlic  (i.  srnt/ds.  l)iit  also  (1.  h(irh(ihiln.<. 
Ulack-jiTeeii,  M)n)ftiim'.s  more  int'taiiic-Iiiark.  Tace  of  llie  ^ 
i)li'(k,  (if  the  9  black-^ray,  tiie  latter  much  l»i-(i;irler  tiiau  in  the 
1  ;  upon  its  lower  part,  in  the  9.  several  hardly  perceptihle  l)la(!k 
hairs,  whicli  1  did  nut  observe  upon  the  face  of  the  S .  .\iileMiiie 
entii'ely  l)lack  ;  the  third  Joint  hroad,  rather  short,  however  sonie- 
wiiat  loiiti'er  in  the  ^  than  in  the  9.  hare,  that  is  to  say.  only  with 
tlie  usual  iiiieroseopie  i)nl)eseenee,  which  is  very  ditlieult  to  ob- 
serve. The  Hither  stronji;  arista  is  also  covered  with  this  almost 
inipereeptii»le  juihesceiiee.  Front  dark  metallic  jrreen  ;  t!ie  rather 
whitish  dust  upon  it  l)ecoines  visiltle,  when  viewed  in  nn  ol)li(|ue 
(licection.  Cilia  of  the  inferior  orbit  black.  The  scntellum  has 
besides  the  usual  two  bri>tles,  also  some  shorter  hair.  Feet 
l)lack,  tip  of  the  eo.\;u  and  trochanters  in  well  maturecl  s]»ecimens 
hardly  much  paler;  tii»  of  the  femora,  the  tiltia",  and  the  root 
of  tlie  four  anterior  tarsi  brownish-yellow;  tip  of  the  hind  tiliia^ 
brownish,  the  ro(»t  of  the  himl  tarsi  sometiiiu's  brown.  In  less 
matured  specimens  the  lower  side  of  the  femora  is  mostly  pitch- 
brown.  Cilia  of  the  te^ida^  lilaek.  The  small  brownish-l»lack 
lanu'lhe  of  the  hypopyjiium  are  crescent-shaped,  and  adhere  with 
the  concave  side  to  the  hypopyu-ium.  i^(t  that  their  true  foi'm  cannot 
be  easily  perceived ;  uii  their  convex  side  they  are  fringed  with 
small  blackish  hairs,  lait  not  jac-tred.  The  winjrs  are  comparatively 
loiijr,  distinctly  tinged  witli  smoky  black;  the  third  ami  ftttirth 
h)n;^'itudinal  vein.s  show  towards  the  end  an  iiidicati(»n  of  a  slipht 
conver<rency ;  the  hind  transverse  vein  is  eomi)aratively  distant 
from  the  nnirgiu  of  the  winjj. 

Hah.   Sitka.     (Wahlbernr.) 

Oh^crratioii  1. — (ryuin.  tristis   is  distin*rui.shcd  from   (hjmn. 


m 


^IW 


.a  I 


I 


w;- 


■  -ft  ;i. 


84 


PIPTERA  OP  NORTH  AMflKICA. 


[PAIIT  ir. 


hnrhnlidna  by  its  larpror  sizo,  its  lunpcr  and  (lar]<('r  wiiiji's,  and  hy 
a  (larJicr  and  less  liairy  fact> ;  the  male  furtiu'r  diilVrs  hy  tlio  <,nvatet 
length  of  tiie  laiiu-Ilaj  oftiio  hypojtyfrimii.  From  (I.  nfofins  it  dif- 
I'tTs  hy  th(.'  third  joint  of  tlu;  aiitt'iiiiiL',  which  has  not  ilio  long  hairs, 
so  apiKirciit  in  (/.  scolidfi. 

(Hnii-rro/ion  '2. — A  niak;  from  the  same  locality  shows  a  con- 
siderably stronger  eonverffcncy  of  tlie  third  and  fmirth  lon^ituilinal 
veins,  coinciiles,  however,  so  mnch  in  all  the  other  characters  with 
the  rest  of  the  nudes,  that  I  cannot  consider  it  for  more  than  u 
variety,  although  a  very  striking  one,  of  (i.  Iri.'-lis. 

15.    Prevail i)ui  rolor  of  the  feet  ijeUow. 

6.  <■•  oxiliH  lionw.      %. — Viridis,  ptxlibus  llavis,  coxaruni  intermedia- 
rum  basi  tVmorumiiue  posticorum  apice  nigricaiitibus,  tarsis  fusuis. 

Green,  witli  yellow  feet,  tlie  basis  of  the  middle  eoxie  and  the  tip  of  the 
hind  femora  blackish,  tarsi  brown.     Long.  corp.  0.10.     Long,  ah  0.11. 

Bvx.    (iiimiinj)tviniis  ij-ilix  Loew,  Meiie  15eitr.  VIII,  30,  5. 

(Jreen  or  bluish-green,  not  very  bright.  Face  ami  front  light 
grayish.  Antenn-.e  brownish-liiack  ;  the  second  joint  and  tlie  root, 
of  the  third  reddish-brown ;  the  third  joint  comparatively  rather 
large,  not  very  broad  in  proportion  to  its  size,  not  rounded  at  the 
tij),  distinctly  hairy;  the  ])ubescence  of  the  not  very  long  arista 
is  diflicult  to  ])erceivo.  Cilia  of  the  inferior  orbit  l>la(dv.  Tho- 
rax, in  conse(pience  of  a  light  cover  of  dust,  somewhat  dull,  and 
grayish-green.  In  one  specimen  only,  J  ))erceive  upon  the 
scutellum,  besides  the  usual  bristles,  a  few  snmll  hairs,  which  are 
rather  indistinct.  Feet  pale  yellowish.  Middle  coxae  upon  the 
outside  distinctly  blackened  beyond  their  middle.  ]lind  coxa^ 
darkeiu'd  only  at  the  basis.  Tip  of  the  hind  fennira  distinctly 
blackened  upon  the  upper  side.  Fore  and  middle  tarsi  infuscated 
from  the  tip  of  the  lirst  joint;  hind  tarsi  black-brown  to  the  same 
extent.  The  row  of  .short  small  bristles  which  is  usually  found 
ui>on  ijjo  u])iter  side  of  the  fore  tibiiu  in  the  species  of  Gf/mvop- 
terni(.-<  is  less  developed  here  than  in  most  of  the  other  species. 
(Mlia  of  the  tegular  black.  Wings  gray.  The  snndl  lamellae  of  the 
hypopygium  yellow,  fringed  witli  rather  ai»parcnt,  snmll  black 
bristles;  their  form  is  rather  kidiu'v-shaped,  still  tJiey  have  in  the 
lower  corner  a  very  snudi,  somewhat  protruding  black  flap  ;  the 


B?''' 

H 

1 

GYMNOPTKIINI'S. 


^i) 


interior  nppon(la<ros  of  tlio  iiypopyjiiinn  lionr  a  fow  hairs  iR'lorc 
tiio  tip. 

ll(il).    IN'iinsylvaiiia.     (OsU'ii-Sndvon.) 

T.  («.  spt'etitbiliH  Lokw.     9* — Thoi-ace  violac<!o,  anteiinis  iiigris,  coxia 
iiiirricaiitilius,  {H'dilms  llavi.s. 

Thorax  violet,  anti'iina>  black,  cox;l>  blackisli,   feet  yellow.     Long.  corp. 
0.17.     Long.  al.  (t.l7. 

Sy.v.    (ij)niioi>tt'rntis  spi-rtnliHis  LoEW,  Neu«  Reitr.  VIII,  30,  C. 

Is  aiii  .11^  tlio  larjrcst  Norlli  Aincriciiii  sitccics  of  tliis  liTiiiis 
known  to  me.  Face  and  front  witli  an  alni(»st  silvtry-wliitc  dnst, 
thoui^li  upon  tlic  latter  tlie  dust  is  less  tliick.  Anteniue  altnuctlier 
black;  third  Joint  short;  the  arista  is  somewhat  stont  at  the  ha>is 
and  has  a  plainly  pereeptihle  jtnheseenee.  Cilia  of  the  inferior 
orbit  idat'k.  The  npper  side  of  the  thorax  metallic  violet,  the  scu- 
tollum  likewise;  the  latter  lias  some  short  hairs  in  the  middle. 
Abdomen  blackish  metallic  jrreen.  Iirijiht.  All  tin;  coxa'  np  to  the 
extreme  tij)  blackish.  Feet  yellow,  tarsi  from  the  tip  of  the  first 
joiid  inftiscated;  tiie  usual  row  of  bristles  up(Mi  the  upper  side  of 
the  fore  tiliia'  complete  and  distinct,  llion<rh  the  single  bristles  are 
comparatively  not  lonjf.  Cilia  of  the  teunhe  black.  Winirs 
tiiip,ed  with  g-ray-brown,  towards  the  anterior  nuirjiin  a  little 
browner;  the  third  and  fourth  lon<i-itmliiial  veins  perfectly  parallel. 

Hah.   New  York.     (Osten-Sacken.) 

Ohiicrralion. — Had  Mr.  Wiedenuinn  not  staled  the  si/e  of  />i>- 
livhopus  obscurus  Say  to  be  l{r  line,  I  woidd  have  most  certainly 
believed  that  my  G.  .sy^iv/o/^/Z/.s  is  the  />.  i>h,<<-uriifi  of  Mr.  Say. 
Nevertheless  the  statements  of  y\M.  Wi«'demann  and  Say  about 
J),  uhncio'itft  do  not  apply  so  closely  to  Ci.  sjicclahilis  as  to  waive 
such  an  important  difference  and  to  consider  both  species  as  one 
and  the  same. 


■  r 

V 


f:ui 


,.■1  ■ 


•■      I  ■ 


1^4; -I 


8.  <».  albiceps  Loew.     9  • — Thorace  violaceo,  antennia  rufis  in  apice 
fuscis,  coxis  pedibusciue  (lavis. 

Thorax  violet,  the  red  antenna?  brown  at  the  tip ;  coxa;  and  feet  yellow. 
Long.  corp.  0.17.     Long.  al.  *>.17. 

Sy\.   Gi/niiioptcrnus  aVnaps  Loew,  Neue  Beitr.  VIII,  30,  7. 

Face  very  broad,  more  so  than  that  of  (1.  f<jJi'ff(/hiI'K,  snow- 
white.     Antenmu  dusky  red  ;    third  joint   small,  rouni.ed,  dark 


'V.:^ 


1;:,- 

■I. 

! 
! 

■i 


I^-W 


86 


DIPTERa  of  NOHTIl  AMERirA. 


[I'AUT  ir. 


l)rowu  tipon  tho  apical  half.  Arista  with  u  foiiiparativcly  long 
and  sti'iiiiiif?  jdiltcsccncc.  Front  covered  with  a  siiow-wliite  dust. 
Cilia  of  tlie  inferior  orhit  biaek.  Tiiora.v  und  scntelluin  metallic; 
violet  ;  no  hairs  are  i»ercej»til»le  upon  the  surface  of  the  hitter. 
Alxlonien  metallic  dark  frreeii.  Co.xa'and  feet  yellowish;  middle 
••oxa-  upon  the  outside  with  a  frrayish  streak.  'I'arsi  from  the  tip 
of  the  lirst  joint  {rradually  hhickened.  'I'he  nsind  row  of  hrislles 
on  the  ujjper  side  of  the  fore  tiliia'  is  extant  and  cuinplete;  the 
sinjile  hristles,  however,  e(»mi)aratively  short.  Cilia  of  the  tejiuhe 
Mack.  Winn's  tinjrcd  with  jfrayish-l)rown,  a  little  more  lirown 
towards  the  anterior  nnirji'in;  the  third  and  fourth  longitudinal 
veins  very  slightly  converging  towards  the  end. 
Ilah.    Middle  States.      (Osten-Sacken.) 


9.  a.  Hiilidilutatiis  Lokw. 


-Viriilis,  antcniiis  iiiiTis,  coxis  niirri- 


•-■*■; 


cantilius,  aiitiuarnn»  apice  ptMliliusiiue  llavis,  maris  tarsoium  anticorum 
ai'ticulo  ultimo  depresso,  siibililatato. 

Green;  antenii.'fl  l)lack ;  coxie  lilackisli ;  tip  of  the  lore  coxw  ami  the  feet 
yelh)\v  ;  the  last  joint  of  tho  fore  tarsi  of  the  %  liatteiieil  and  a  little 
enlarged.     Long.  eorp.  U.i;).     Loni;.  al.  O.i:). 

SvN.    <i'i/mnopl<TiiHs  suliililatatus  Lokw,  Neue  Beitr.  VlII,  '.il,  8. 

Metallic  green,  rather  bright.  Face  covered  with  a  whitish 
dust.  Antenna'  entirely  black;  third  joint  short,  rather  rotmded; 
arista  with  a  scarcely  perce|>tible,  extremely  short  pul»esceiii'e. 
Tho  cilia  of  the  inferior  orbit  seem  to  be  bhnk  ;  upon  the  scutel- 
hini,  l)esidc.>5  the  usual  two  bristles,  a  few  small  hardly  ))erceptible 
hairs  are  inserted.  The  rather  large  lameihe  of  the  hypopyginm 
arc  more  kidm'y-shai)ed  than  crescent-shaped,  upon  their  lower 
side  brownish-yellow,  upon  the  upper  i)art  brownish-black,  closely 
fringed  with  black  bristle-like  hairs;  the  interior  ajjpemlages  are 
simple.  The  fore  ooxte  lilackened  as  far  as  the  middle,  middle 
and  hind  eoxie  almost  as  far  as  the  tip.  Feet  yellowish,  a  little 
more  slender  than  in  the  allied  species.  The  hairs  on  the  hind 
feinoi-a  are  also  blackish  upon  their  under  side,  and  more  distinct 
than  in  the  related  species.  The  usual  row  of  bristles  on  the 
upper  side  of  the  fore  tibiic  is  extant,  but  the  single  bristles  are 
very  short.  Fore  tarsi  from  the  tip  of  the  tirst  joint  strongly 
infuscated,  towards  the  tip  black,  very  sit  iider,  but  hardly  longer 
than  the  tibiju.  Their  first  joint  is  as  long  as  the  two  following 
taken  together;  the  last  joint  is  flattened  and  a  little  enlarged. 


;t4^?:?lt 


?c 


OYMNOPTEUNUS. 


87 


the  pnlvilli  also  larger  than  usual.  Tlic  luidtUe  and  the  hind 
tarsi  strouffly  infuscated  IVoin  (he  tip  of  the  first  joint,  towards 
the  tij)  binclv.  Cilia  of  the  u-guhu  blaek.  Wings  tinged  with 
)>lackisii-gray. 

JIab.   Middle  States.     (Osten-Sacken.) 

OhKn'rafiun. — A  single  feniide  s|>e(iinen  agrees  with  the  just 
deserilx'd  male  of  (t.  suhtlilalalua  in  the  eolor  of  the  eoxa»,  and 
cannot  therefore  belong  to  any  of  the  other  species  known  to  me; 
I  am  prevented,  however,  from  taking  it  for  the  ?  of  O.  subdila- 
talus  on  acc(junt  of  the  more  clumsy  shiipe  of  the  feet. 


^■■mi 


•■•* 


;''r  m 


I's,  -iti 

m 

in, 


lO.  ii.  Iwigatlis  LoEW.  %  . — Viridis,  thoraco  subcrenilesscente,  niti- 
di.ssiiuo,  aiit«niiis  parvia  iiigiis,  articulo  socundo  et  teitii  liasi  obscure 
rnlis,  coxis  aiiticis  totis  i)e(lil)U!i(|U«  jKiUide  Davis,  tarsis  posticis  inde 
ab  articuli  piiini  apice  nigris,  lauu'Uis  hypopygii  pallide  liavis,  apjiendi- 
cibus  iuterioribus  siniplicibus. 

Green,  with  a  somewhat  violet,  very  briirht  thorax ;  the  small  antenna) 
black,  the  second  joint  and  tlie  root  of  the  third  dusky  red  ;  the  whola 
fore  coxa)  and  the  feet  yellow,  the  hind  tiirsi  from  the  tip  of  the  llr.--;t 
joint  black  ;  the  lamella-  of  the  hypojiygium  i)ale-yellow  ;  the  interior 
appendages  simple.     Long.  corp.  0.12.,     Long.  al.  0.12. 

Syx.  Gi/mtiopterniis  Iwviijiinis  Loew,  Neua  Beitr.  VIII,  31,  9. 

Green,  bright.  Face  and  front  covered  with  whitish  dust.  An- 
tenme  small,  black  ;  the  second  joint  and  the  root  of  the  third 
dusky  red.  Arista  with  a  short  but  distinct  pubescence.  The 
cilia  of  the  inferior  orbit  seem  to  be  bliick.  I'i)])cr  side  of  the 
thora.x  ))luish-green  and  very  bright.  Vpon  the  surface  of  the 
scutelluni,  besides  the  usual  bristles,  there  are  a  few  quite  imper- 
ceptible little  hairs.  The  snniU  lamella)  of  the  hypopygium  are 
ligiit-yellowish,  with  a  scarcely  jjcrceptible  blackish  border  ami 
crescent  shaped.  Co.xie  and  feet  white-yellowish  ;  the  mitldle  coxie 
on  the  outside  ahnost  as  far  as  tiie  tip,  and  the  hind  coxa^  at  the 
root,  blackened.  The  hairs  on  the  feet  are  somewhat  coarse,  and 
the  usual  row  of  bristles  on  the  ui)per  side  of  the  fore  tibia'  con- 
sists of  comparatively  long  and  rather  strong  bristles.  Kind  tarsi 
l)lack  from  the  tip  of  the  first  J<iint;  fore  and  middle  tarsi  infus- 
cated from  the  same  joint.  Cilia  of  tiie  tegidu'  l)hick  ;  wings 
tinged  with  blackish-gray  ;  the  end  of  the  third  and  fourth  longi- 
tudinal veins  parallel.' 

JJab.  Middle  State*. 


«'  ■■■'■ 


' :  .  ■  •  I 

,i 

I..-  ' 


^ 


88 


MITKUA  OP  NOUTFI  AMFIUrA. 


[pAnr  It 


Olt.'<crrnfiiii}. — Il'tlic  culdriii;:;  of  tlic  tiirsi  slmiild  not  prove  cuii. 
8tiiiil,  lli((  (listimtiiiii  'rniii  (/.  jki rrirnni is  ^^■^^\iU\  \)v  rnUwv  iWWi- 
cull.  It  would  tlu'M  lu'  ut'ccssjirv  to  ohscrvc  tluit  tlic  I'cct  of  the 
present  species  tire  decidedly  souu'wiiiit  more  clumsy  and  c<»vere<l 
with  courser  linir,  iind  tliiit  tliu  row  of  Itristlcs  on  the  upper  sido 
of  the  fore  tihiif  consists  (»f  somewhat  h)njj:er  ItrislJes.  The  con- 
iormily  of  Itoth  species  in  the  structure  of  the  antenniu  mid  of  ilio 
appeiidajics  of  the  Iiypopyuriuiii  is  strikin}.f.  (i.  licrujalus  cannot 
he  cont'oiinded  with  any  other  species. 

11.  <■.  fretllll'llM  LoKW.     %  and  9> — Oltscure  viridisvelneneo-viridis, 
itcimis  iii^iis,  fiicit!  ft  IVonle  ex  albo  cineruis,  pedibus  flavis,  lanu'Uirf 


ai 


liypopygii  nigris. 

Dark-grt't'ii  or  broiize-fjret'ii ;  aiitenna>  black  ;  face  and  front  whitiah-gray ; 
feet  yt'How ;    biiiiolbc    of   the   hyi>oi)ygium    black.      Long.   corp.   0.1-. 


Long.  al.  (Mli— O.L'J. 


Byn.    < 


iijiuinijiti  lutts  J'r<(jii(tii 


LoEW,  Neue  Beitr.  VIII,  32,  10. 


IJlackish-jrreen,  recently  develo|»ed  s])cciinciis  ratlier  hhiish^. 
green,  more  aj^ed  specimens  darker  l)roiize-};reeii.  Face  and  front 
covered  with  u  whitish-<iray  dust.  Aiitcnme  Itlack,  the  third  Joint 
(piite  small  ;  arista  with  a  short  hut  distinct  puliescence.  ('ilia  of 
the  inferior  orliit  black  ;  upon  the  surface  of  the  scutellum  there 
are,  besides  the  two  bristles,  several  short  hairs.      C(»Xii'  and  feet 


}■ 


ellow  ;  middle  coxjc  almost  (Ui  their  whole  outside  blackish,  or 


at  least  brownish  ;  the  fore  coxse  show  only  at  the  extreme  l)asis 
traces  of  a  brownish  tinjre.  such  as  is  often  also  perceived  on  the 
hind  coxtc.  The  usual  row  of  bristles  on  the  upper  side  of  the 
fore  tibiie  is  distinct  and  dense.  The  hind  tarsi  become,  from  the 
tij)  of  the  first  joint,  more  and  more  brown,  their  tip  is  l)lack- 
bntwn.  The  fore  and  middle  tarsi  are  infuscated  in  a  similar 
inanner,  but  less  dark.  Cilia  of  the  teji'iihe  black.  "Winsrs  tin,u-ed 
with  blackish-g-ray,  the  third  and  fourth  lon<ritiidinal  veins  with  a 
slijrht  trace  of  convergency.  The  lainelhi!  of  the  hypopyji'ium 
black,  (piite  rounded  at  tlie  end,  fringed  with  black  hairs ;  the  in- 
terior api)endafres  not  bristly. 

Ifftb.   Middle  States.      (Osten-Sacken.) 

Ohxcrralion. — Cf.  j'iT</ifciif<  is,  among  the  kindred  species,  the 
only  one  whose  males  have  black  lamella',  and  thus  is  easy  to 
recognize.  Female  siiecimcns  occur  which  have  the  dust  upon 
face  and  front  much  whiter;  in  other  respects  they  are  like  the 


OYMNOl'TEUNMS. 


SO 


other  fciiiiilcs.  Wlictlicr  tlicy  iirt',  as  I  suppose,  merely  ii  viiriety 
ol'  (I.  fni/iienn,  or  wlielher  lliey  Itelonjr  to  uuotlicr  elosely  re- 
lale<l  species  cim  only  lie  deteriiiiiied  liy  further  ohservalious. 
Tlie  chaiifri'S  in  si/.i;  of  the  present  species  arc  nut  so  slrikih-:'  as 
Would  appear  from  the  measurements  jj-iven  aliove,  hecause  thi; 
Iar<i'er  specimens  are  always  fenndes,  which,  in  this  species,  more 
than  iismd  exceed  the  nniles  in  size.  It  will  he  (piitc  ditlieult  to 
(listingiiisli  llio  fcmule  of  (/.  lunifcr  from  that  of  (,'.  Jh'ijiuns. 

]!2.  €>.  llliiifor  liOKW.  'J, .— Oliseuro  viridis  vfl  aenco-viridis,  aiiten- 
iiis  iiii;iis,  t'acio  ut  frontu  ciiiereis,  j)LMliliiis  tlavis,  lamellis  liypopygii 
obscaio  liitt'i.s. 

Daik-givcii  or  l)roiizo-grcen,  aiitcniiro  lilaok,  face  and  front  f,ray  ;  feet  yel- 
low ;  lamellro  of  the  liypopygiuiu  dark-yellow.  Long.  corp.  0.13 — (i.l4. 
Long.  al.  tM3— 0.14. 

SvN.    Gymiioptcnuia  hiuifir  LoEW,  Neuo  Ik-itr.  VIII,  32,  11. 

Dark-g'reen,  rather  hrijrht,  face  and  front  with  wliitisli-jiray 
dust.  Antenna'  rather  short,  entirely  hiack,  the  third  joint  small, 
not  ntunded  at  the  einl.  Arista  with  a  short,  Imt  distinct  ))ul»es- 
cence.  Cilia  of  the  inferior  (U'hit  Mack.  Upon  the  sciilellum, 
hesides  the  bristles,  a  few  not  easily  perceptil)le  hairs;  the  lamelhe 
of  the  liypoi)ygium  a  little  larjrer  than  those  of  the  kindred  species, 
crescent-shaped,  I)\it  rounded  on  the  ui>per  end,  so  as  to  hecome 
somewhat  kidney-shaped,  and  thus  to  api»roach  the  shape  of  the 
hunelhe  of  (/.  .viilxJila/alK.s.  They  are  of  a  dinjry  hrowidsh-ycllow 
color,  and  u|)on  the  u]»per  maru'in  somewhat  hlackish.  Their 
black  i'rinjro  is  not  so  strong:  as  that  of  <i.  xiih(Iilrilii/ii.<.  Furo 
coxic  dark  yellow,  a  little  brownish  at  the  extreme  basis  ;  the  mid- 
dle and  hind  coxne  black  almost  up  to  the  extreme  tip.  Feet 
somewh  it  dark  yellow,  rather  slender,  hind  femora  somewhat  in- 
fuscated  on  the  upper  side  towards  the  tip.  The  usual  row  of 
liristles  on  the  U))per  side  of  the  fore  til)ia'  is  complete.  'I'arsi 
brownisli  towards  the  tip.  Cilia  of  the  teguliu  black  :  wings  tinged 
with  brownish-gray. 

JJob.  New  York.     (Osteu-Sacken.) 

13.  ii,  finibriatllH  Lorw.  %  . — Viridis,  pedilms  et  coxis  Havis,  coxis 
intt»rni«'diis,  apice  excepto,  jiigricautibus  ;  appendiclbus  hypopygii  iiito- 
rioribud  clougatis  et  peuicillatis. 


'  ■    .J 

w 

1 

^lii 

? 

- 1 

1 

ii 

' 

II! 


■:i: 


!^'V' 


rl'-'lMmM 


90 


Uri'TKHA  (»K  N(»liril  AAIKUK'A. 


[I'AIIT  II. 


(in'j'ii,  feet  and  rox.T  jitIIow,  Dm  iiiii|<ll*t  tosiv  liowi'VfT,  with  the  i'X(»*j)- 
tidii  of  ilit>  tii>,  lil.-u'kisli  ;  tlio  iiittM'inr  m|)|i)'iiiI,'il;*>s  of  tli<*  liviiopvgium 
cloiicatol,  liaiiy,  |iiMiiiillat«!.      I.oiiu'.  corii.  'Mo.      Long.  al.  0.11. 

Sv.N.    (ii/Hiin'fiinniiinJiHihrifihis  LoKW,  Ncuo  Heitr.  VIII,  ',i'2,  12. 

Ilallicr  liirlit-^M'ci'ii,  liri^lit.  l"'«cc  tiiid  Iniiit  CMvrn'd  with  a 
wliiti-;rniyi>li  dust.  Aiilcnnii!  oiitin-ly  l.lnrk,  slmrt,  tlio  third 
jtiiiit  I'liiitidtMl.  Arista  with  an  ('.xtrciiicly  sliort  and  vitv  iinpcr- 
«'c|itiltli'  iHilK'sccncc.  Cilia  of  llic  iMlcridr  tirl»it  lthici\.  'I'lit'  iippoi' 
ti'iiU'  of  tlif  tlinra.v  niiMlcralcly  Itrioht.  r|iiin  the  sciitcllnni  only 
traces  nf  very  iiniicrccptilth'  liairs.  'I'lic  hiiiicjhi'  of  the  hy|)o|)yi>-iiiiii 
whilish-yt-iluw,  (Tcsccnt-shaiH'd,  ciliated  with  stilVltlack  hairs;  tho 
intcrinr  appciKhijfcs  somewhat  ehmji-atcd,  with  a  hnish-liko  tnl't  of 
lonir  hairs  at  the  oiid.  ('o.\iL'  and  Ici-l  vi-ilow,  inori'  sli'inU-r  than 
those  of  the  next  foliowinff  species  ;  most  of  the  outside  of  the 
middle  coxu'  Itlaekish  ;  tlie  fore  and  hind  coxa'  hardly  somewhat 
lilackened  at  their  oxtreme  hasis.  'I'arsi  somewhat  infuscated 
towards  the  tip,  ('specially  the  hind  ones.  The  usual  row  oi 
bristles  (>n  the  upjier  side  of  the  fore  tiltia-  is  extant  ;  the  sinfrlo 
])ristlos  of  middle  si/A'.  Cilia  of  tho  tegtdiu  black.  Wing.s  tinjred 
with  trray. 

Jiitfi.   Maryland.     (Osteii-Sacken.) 

14.  a.  tleH|>ic(ltll»  LoKW.  %. — Viridis,  nntonnis  nigris,  facie  et 
fioiiti'  .•illiiilc-iKillinosis,  pedibuH  flavis,  tibiis  posticis  jjropu  apicoin  supra 
paulo  lonuius  pilosis,  (luani  in  sjx'c^iehus  ad  quas  acccdit ;  alarun»  vciiia 
lonuitudinaliltus  tertiilet  quartfi  subconvergentilius  ;  laiuellis  hypop^-gii 
pallide  Have.seentibus. 

Green,  anlfiina'  Vdack,  face  and  front  covered  with  a  whitish  dust ;  feet 
yellow  ;  Jiind  tibije  on  the  ui)per  side  towards  the  end  with  longer  hairs 
tlian  in  tlie  allied  species  ;  tlie  third  and  fourth  loiigitmlinal  veins  of  the 
wings  show  a  slight  couvergency  ;  lamella)  of  the  hypoi)ygium  pale  yel- 
low.    Long.  corp.  0.12.     Long.  al.  0.12. 

Bvx.    G>)mnoi>t(rnHn  dcspicatus  Lokw,  Neue  Beitr.  VIII,  03,  13. 

Green,  ratlier  bri<rht.  Face  and  fnmt  covered  witli  whitish 
dust.  Aiitenmv  entirely  black  and  only  of  inicMle  lenji'th  ;  the 
third  joint  lather  rounded  at  the  tip.  Arista  with  a  very 
short,  hardly  perceptible  j)ul)esconee.  Cilia  of  the  inferior  orbit 
black.  U])on  the  scutellum  of  tho  described  specimen  there  are, 
besides  the  two  bristles,  only  a  few  small,  pale  hairs  on  the  mar- 
gin.    Lamelhe  of  the  hypopygium  i)ale-yellowlsh,  crescout-shaped, 


^Bf- 


UYM.N()I'TEUNU«. 


n 


friii^'cd  on  tlio  luarjyin  witli  smtill  hliick  hnirs.  Tho  interior  ap- 
pcmla^jt's  plain.  Coxa'  ami  I'cct  yi-Jluwisli,  Middle  cuxa'  (tii  tlii! 
outside  as  far  us  soiiK-wliat  licymid  tlie  iiddillr,  l»lacki>li.  'I'lio 
usual  row  of  l)ristl('s  ou  the  upper  side  of  the  loro  lil>ia'  is  eoni- 
plele,  and  consists  »»f  coniparalively  larjfc  Itristles.  'I'lie  usual 
Kliort  liairs  upon  the  last  third  of  the  upper  side  of  the  hind  lilaa! 
are  not  only  a  little  denser,  hut  also  visil)ly  loiij>er,  than  in  the  allied 
Hpi'cies.  Tarsi  towards  the  end  a  little  lilaekish.  Cilia  ol'  the 
tefi'ida;  black.  Wiujrs  tinp'd  with  jfray.  Third  and  I'ourth  longi- 
tudinal veins  towards  the  end  u  little  nn»re  appro.xinnited,  and 
Iherel'ore  a  little  more  converjrinjr,  than  in  the  allied  species. 
JIuh.  Midtlle  States,     (Osten-Sacken.) 

15.  <rt.  dlfllcills  LoRW.  %. — Viridis,  nnti'imis  uigris,  facio  et  fronto 
iilliiilo-polliaosift ;  pcililms  H;ivis ;  tarsin  apiceni  versus  diliite  iiit'asciitis, 
nlnruin  vtuis  longitudinaliluH  tertia  et  4U:irtil  port'ecto  iiiualli'lLs; 
liiiaullis  hyjiopygii  i)iilliilo  llavosuuiitilms. 

Oruea,  anteaiiiu  l>liick,  face  ami  front  covered  with  a  whitish  dust,  feet 
yellow,  tarsi  l)ro\vnisli  only  towiinls  the  tij>,  third  and  fourth  Ion  Uudi- 
nal  veins  perfectly  |iaralU)l ;  laiaelhe  of  tho  liypopygiuni  iiale-yellowish. 
Long.  cor]).  0.12.     Long.  al.  0.12. 

Sv.\.   GijmHiiptirniix  tlij/icilis  Loi:w,  Neuo  Ueitr.  VIII,  li3,  14. 

Is  so  extremely  like  the  preceding'  species,  that  the  stutemoiit  of 
the  dilVerences  will  l)e  suilicient  for  its  recognition.  They  consist 
in  the  followiuf?  :  the  usual  row  of  bristles  on  the  upper  side  of 
the  fore  tiliite  consists  of  much  smaller  bristles.  The  hairs  o.i  the 
upper  side  of  the  hindtiliia*  are,  towards  their  end,  less  dense  and 
lonj; ;  the  third  and  fourth  longitudinal  veins  are  perfectly  parallel 
towards  their  end,  and  all  the  louyitudinal  veins  h-ive  a  i)uler 
coloring. 

JIab.  New  York. 


1;  I 


16.  fw.  liigribarbUH  Loew.     J  . — Nigro-fpnous,  thorace  cnDrulescente, 
subopaco,  Inferd  faciei  parte  pilis  nigris  barliata. 

Bronze-black,  tliorax  rather  hlue  and  somewhat  dull,  tho  lower  part  of  tlie 
face  bearded  with  hlack  hairs.     Long.  corp.  0.09 — O.lO.     Long.  al.  0.12. 

Sy.v.   Gymnnplernns  iii</ril>arhiis  LoEw,  Neuo  Beitr.  VIII>  315,  l.'i. 

IJrouze-blackisli,  th(jrax  rather  blue,  and  rather  didl  on  account 
of  a  dense,  brown-gray  dust.  Face  covered  with  a  whitish-gray 
dust,  rather  broad,  upon  its  inferior  portion  convex  and  beset  with 


^l\ 


"  "TO 


1)2 


DllTKUA  OF  Xoltril  AMKItlCA. 


[I'AItT  II. 


#PI 


11  slinrt  lint  distinct,  iiinl  nitlicr  slrikiiii;  jmiIm'sccmcc.  Aiitcn  iie 
siiiiill,  l)liii-lv-lini\vii,  sccoihI  Joint  iiiid  tlic  root  nl'  liic  tliird  red; 
(lie  lliird  Joint  rounded  at  the  end  and  licsct  with  vcrv  distinct 
)inl  not  loULT  hairs.  Arista  with  a  <"oin|iaralivclv  lont;',  very  dis- 
tinct |)nl»csccncc.  The  front  seems  in  most  directions  liiiht. 
hrownish-irrav  ;  in  otln'rs  nearly  whitish.  Cilia  of  the  inferior 
orliit  ItlacU.  rpiier  side  of  the  thorax  rather  l)lne  a!id  dull  on 
nccoiint  of  a  li'ray-lirowiush  dust.  S<'nlellMm  apparently  jilahrous 
upon  its  iip|»er  snrfaee.  The  color  of  the  alidonien  vai'ies  Itetween 
Itronze-ldacU  and  hroiizc-irreen.  Fore  coxa'  yellow-lirowiiish  at 
the  liase;  ndddle  coxa-  almost  up  to  tlie  tip,  hind  coxa'  altont  as 
far  as  the  middle,  l)lackish.  Feet  yellowish.  'I'ar:;i  moderately 
infuscated  towards  the  tip.  The  usual  row  ol'  bristles  on  the 
upper  side  of  the  foro  tibia*,  consists  of  comparatively  short 
liristles.  (.'ilia  of  the  tej^uhe  black.  Winu's  with  a  rather  stroiij^ 
blackish-ii-ray  tinu'c.  The  third  and  fourth  lungitudinul  veins 
j)arallel  towards  the  eiul. 
Ihtb.  Pounsvlvunia, 


17.  G.  iins'vicoriiis  Lm-.w. 


-Viridis,  tlioraoe  crprnloscente,  iiiti- 


|:pi!'-- 


ilissiiiio,  oiitcniiis  jiarvis,  nigris,  iirticulo  Sfcii'.ulo  ft  articuli  tcrtii  l);isi 
rulis  ;  coxis  ;iiiticis  totis,  ]iiMlil)US(iue  {>alli(U>  Iltivis,  tiirsis  a|)iceni  versus 
iiiluscaiis.  lanicUis  liypopygii  pallide  tlavicantihiLs,  appendicibus  inte- 
riorihus  siiiiplicil)us. 

Green,  ilio  V)luisli-grt'en  thorax  very  liriiilit ;  tlio  small  autenn.i>  black,  the 
second  joint  and  the  root  of  the  third  red,  the  whole  fore  co.xa)  iiiid  the 
feet  pale  yellowish;  tarsi  towards  the  tip  brownish;  tlie  lamelhe  of  the 
hypopypiam  piile  yellowisli ;  the  interior  appendages  jjlain.  Long. 
Corp.  (>.12.     Long.  al.  (1.12. 

Svs.    (ii/!iiiii>plt'nius  parricnniis  Lokw,  Nene  Beitr.  VIII,  34,  16. 

(Ireeii,  brig-lit,  fnce  and  front  with  a  white  dust.  Antoinia^ 
small,  l)lack;  second  Joiid  and  the  root  of  the  third  red;  third 
joint  remarkably  small  and  m)t  rounded  at  the  tip.  Arista  with 
a  short  but  distinct  i)ubesceuce.  Cilia  of  the  inferior  orbit  black. 
Upper  side  of  the  thorax  bluish-<ireeu  and  very  bright.  Uj)on 
the  surface  of  the  sciitellum  there  seem  to  be,  besides  the  usual 
l)ristK's,  a  few  small  hairs.  The  small  lanu'lhe  of  the  hypopvji'ium 
are  whitish-yellow  with  a  scarcely  i>ercei»til)le  bla' k  nmr<i-in,  cres- 
cent-'^haped.  Coxa*  ami  feet  whitish-yellow;  the  middle  co.xa^  on 
the  outside  almost  up  to  the  tip,  and  the  hind  coxa;  at  the  root, 


■<i[ 


OYMNOl'TKKN'l  S. 


93 


bliU'kisli.  The  hairs  uii  tlie  loci  iirc  sciirccly  sd  r(in<;h  as  usual, 
and  the  row  of  bristles  on  the  upper  si<h'  of  the  fore  tiliiii'  consists 
of  rather  shcrt  bristles.  'I'arsi  Init  slightly  inl'iiscatcd  towards 
tlicir  tij).  Cilia  of  the  tcanhi'  Mack.  Wing-s  with  a  Itlackish-jiray 
tintrc.  Third  and  lourlh  lonji'itudinal  veins,  towards  the  end, 
jKiraile!. 

JIdh.   Middle  States.      (Osteii-Sacken.) 

Ohxi'n-aliiui. — Tiie  sti'ikinji'  resenihlance  of  this  species  to  <!. 
I,rri(i(ihis  has  already  been  noticed  altovc.  li'  the  snnUl  bristles 
on  the  upper  side  ol'  the  lore  tibia-  were  not  visibly  shorter  in  (his 
species,  1  would  suppose  it  to  l)c  only  a  variety  of  (!.  In  riijahnf 
with  much  paler  tarsi. 


IK 


ij .  iJ '" 


t 

'1' 


►  '' 


■7*71 


IS.  4a.  opariis  LoF.w.  %  . — Viridis,  modico  iiitcns,  facie  et  froiite 
pollino  ex  albo-cinci'i'o  vcsfitis,  ■'uitcimis  iiiiijnsciilis,  fiisco-iiiuris,  f rti- 
cnlo  secmiilo  et  articuli  tcrtii  luisi  lulis  :  jicdilnis  I'uiii  coyis  tlavis  ;  cdxis 
iiitt>niie(Uis,  j).isticnruiii<iiit!  l>asi  iiif,'riiantilius  ;  alls  c.\  llavo  (lilHti.-<riime 
cincr.ascontilius,  Inincllis  liyjxijjygii  parvis,  pallidy  llavesceiitilius. 

(irocn,  only  nioderntcly  shining;  face  aTid  front  with  a  wliitish-gray  dust ; 
antenna*  rather  large,  brownish-black  :  second  joint  and  root  of  the 
third  red;  coxip  and  feet  yeilow,  middle  coxjp  and  the  base  of  the  hind 
coxa'  blackish;  wings  altogether  pale  yellowish-gray  ;  tlie  small  lamella? 
of  the  hyiioiiygiuni  palo  yellouish.  Long.  corp.  (1.1:2 — O.Wi.  Long.  al. 
0.13. 

Syx.    (iijnmt ,><<'riiui^  ojxirns  Loew,  None  I?eitr.  VIII,  34,  17. 

(i!re(>u,  nidy  moderately  shiiUUff  ;  the  dust  ujiou  the  face  s(>eins 
to  be  whitish-<>-ray,  but  in  an  ob!i(pie  lii>ht  it  has  a  more  juiri! 
white  api»carance.  Antenna'  brownish-black  ;  second  joint  and 
root  of  the  third  red;  third  joint  of  a  considcralile  size,  rather 
broad,  foruiintr  a  sharp  anu'lc  at  the  tip,  beset  with  not  very  lont:: 
but  very  distinct  hairs.  Arista  with  a  rather  short  but  very  dis- 
tiiu't  pubescence.  Front  with  a  yellowish-u'rjiy  dust.  I'iliii  of 
the  inferior  orbit  black.  Thorax  dull  on  account  of  a  yellowish- 
frray  dust.  I  cannot  discover  any  hairs  upon  the  -fUtellum.  La- 
mella' of  the  liypopy,!;inm  snudi,  paie-yeilow,  shoi't  and  sparsely 
frinjred.  Pleurtc  witKnut  yellow  colorinir  on  tiie  posterior  mara'in. 
Coxa*  and  feet  ))alo-yellowish.  Middle  coxa'  on  tin'  outside 
almost  up  to  the  tip  and  hind  coxio  at  the  basis,  of  a  dark  color. 
Tarsi  hardly  infuscated  towards  the  tip.  Cilia  of  the  tt'u'idif 
black.     AVinys  with   a  slight  ji-ray-ycllowish   tinge.     The   third 


m 


1.  .■ 


ir:  .  . 


94 


DIPTERA  OF  NORTH  AMKRICA. 


[part  II. 


and  fourth  longitudinal  veins  towards  their  end  almost  entirely 
parallel. 

Hab.  Xow  York.     (Ostcn-Sackcn.) 

Obao.rvotion.  —  A  sinji'le  9  whidi  I  possess  I  believe  to  be 
that  of  the  present  si)ecies.  Tiie  circuiiistanee  that  the  sinirlc 
bristles  of  the  row  on  tiie  upper  side  of  tiie  fore  tibia'  are  some- 
what stroii«i-er,  the  third  joint  of  the  antenme  mueh  siiorter  and  the 
arista  more  distinctly  hairy  than  those  of  the  above  described  ^ , 
connot  justify  any  doubts,  as  the  females  of  nearly  all  the  species 
dilVcr  in  tl)is  way  from  the  males.  The  only  objection  which  mi<rlit 
l)e  raised  ajrainst  their  be!oni>-in<>:  together,  is  the  more  whitish 
color  of  the  dust  upon  Aiee  and  front. 

19.  a.  politll8  LoEW.  9- — Viiidis,  nitons,  faciei  albne  parte  infer^, 
sulitilitcr  pilosil,  fronte  allio-pollinosa,  antennis  ex  fusco  rulis,  apiceiii 
versus  t'uscis,  i:o.\is  pedilmsijue  palliile  flavis,  alis  majusculis  ex  t'u^uo 
cinereis,  appendiuibus  analibiis  duabus  styliformibus. 

Green,  briijlit,  tbe  lower  part  of  tbe  wbite  face  with  delicate  hairs,  front 
with  a  white  dust,  tlie  brownish-red  antennre  brown  at  the  tip;  coxie 
and  feet  pale-yellowish  ;  wings  soniewlu't  large,  brown-grayish  ;  at  the 
end  of  tlm  abiloineii  two  styloid  appendages.  Long.  corp.  0.14 — 0.15. 
Long.  al.  0.14—0.15. 

Syn.    (lymnoptcniiis  politus  LoEW,  Neue  Beitr.  VIII,  34,  18. 

Green,  very  bright ;  the  moderately  l»road  face  and  front  covered 
with  white  dust  ;  tlie  lowest  part  of  the  face  l)eset  with  minute  pule 
hairs  and  a  few  biackish  ones.  Antenna\  at  least  for  a  female,  of 
middle  size,  dusky  bntwnish-red  ;  third  joint  with  short  but  dis- 
tinct hairs,  towanls  the  end  blackish-brown  nnd  the  tij)  sharply 
angular.  Cilia  of  the  inferior  orl)it  black.  Thorax  only  a  little 
dusty.  Ujjon  the  scutellum  I  cannot  ])erceive  any  hairs  at  all. 
The  anal  appendages  distinguish  themselves  from  those  of  the 
related  >i)ecies  by  consisting  of  two  slnu't  black  styles.  The  ])os- 
terior  margin  of  the  i)ieura!  is  not  yelhuv.  Coxie  and  feet  ]»ale- 
yellowish.  Tarsi  but  little  infuscated  towards  their  tip.  The 
usual  row  of  liristles  on  the  upper  side  of  the  fore  tibia)  rather 
prominent.  Cilia  of  the  teguhi'  black.  Wings  rather  broad  and 
])retty  strongly  tinged  with  brownish-gray.  The  third  ami  fourth 
longitudinal  veins  towards  their  ends  with  a  slight  indication  of 
convergeiu'y. 

Hah.  New  York.     (Osten-Sacken.) 


;•.^^ 


■'■■Alt 


kM,' 


GYMNOPTERNrS. 


95 


Ohscrrntion. — It  is  i'einarka))li'  lluit  tlio  circle  of  sliort  thorns  oi\ 
the  tip  of  the  al)(h)men  of  the  fciiiiiU',  which  l)eloii<rs  to  allit'(l  spe- 
cies, is  wantinj^  here.  Tliis  species,  liowever,  cannot  he  located 
in  any  otiier  genus ;  on  tli(!  contrary,  it  coincides  most  perfectly 
in  all  other  respects  with  the  species  of  (ri/innoplcruun. 

20.  G.  debiliH  Loew.  %  and  9- — Viridis,  niodice  nitens,  facie  et 
fronte  cinereo-jioUinosis,  autennis  rufia  apicem  vjtsus  iiigris,  coxia  pedi- 
busijUti  palli<le  ilavis,  alls  ex  llavo  ciiRTeis,  laiuelliii  hypopygii  parvis, 
pallide  flavesceiitibus. 

Green,  moderately  shining  ;  face  and  front  grayish-dusty,  the  red  aiitenn.'B 
black  at  the  tip  ;  coxre  and  feet  pah^-yt'llow  ;  wings  yellowish-gray  :  the 
small  laniell;e  of  the  hypopygium  pale-yellowish.  Long.  corj).  (i.  12. 
Long.  al.  0.12, 

Syn.    Gymnoptenius  ilehilis  Loew,  Neue  Beitr.  VIII,  55,  19. 

Green,  only  moderately  shininp;;  face  covered  with  ^\hite-^•ray- 
ish,  front  with  yellow-jrrayish  dust.  Antenna'  red,  (»f  middle  size  ; 
third  joint  quite  distinctly  hairy,  at  the  tip  hiack-hrown  and  pro- 
vided with  a  sharp  angle;  arista  with  a  short,  hut  distinct  puhes- 
ccnce.  As  far  as  I  can  perceive,  the  ciliiu  of  the  inferior  orhit 
are  black.  The  upper  side  of  the  thorax,  on  account  of  some 
yellow-grayish  dust,  rather  dull.  The  scutelluin  seems  to  he 
hare.  Venter  not  yellow.  Pleunc  wholly  gray,  without  \<  !low 
posterior  margin.  Coxte  and  feet  i)ale  yellowish.  Tarsi  towards 
their  end  a  littl"  >nfuscated.  The  usual  row  of  bristles  on  the 
upper  side  of  t'lo  fore  iihuvi  rather  pronnnent.  Cilia  of  the  tegu- 
lic  1)hK'k.  Wi'.gs  only  with  a  slight  yellow-grayish  tinge.  Third 
and  fourth  longitudinal  veins  towards  their  end  almost  entirely 
l»arallel.  The  small  lamelhe  of  the  hypoi)ygiuni  are  pale-yellow- 
ish and  frinjred  with  little  black  hairs. 

Unh.  Pennsylvania.     (Osten-Sacken.) 

Ohxcrration.  —  G.  dchilix  can  easily  be  distinguished  from 
G.  opdriiH  ))y  its  smaller  size  and  smaller  antenna- ;  likewise 
from  G.  r7as>ii<'nuda  by  not  having  a  yellow  venter  and  the  ]»os- 
terior  margin  of  the  pleunc  not  being  yellow.  From  (/.  /loh'tna 
it  diOers  by  a  more  light-green  color,  less  brightness,  snmller  size, 
(fee.  &c. 

SI.  <».  crassicailda  LoKW.  %  and  9.— Viridis,  modioe  niteiis,  an- 
tennis  rufis  apicem  versus  fuscis,  pleurarnm  margine  postico,  ventre, 
ooxis  pedibusque  pallide  flavis,  hypopygio  maris  vakle  incrassato. 


^'  Sri 


M-k'/" 


H     'i 


■  i . 


Wf 


w 


■i 


96 


DIT'TKHA  OF  NORTH  AMKlUfA. 


[part  II. 


Oreen,  inodfiratoly  shining  ;  tli»>  red  antcnn.'p  lirown  towards  tlie  tip  ;  the 
jHistiTlor  ntargin  of  tlm  iilcUiJi;,  tlie  ventt'.',  tin;  ooxie  ainl  the  I'ect  i>ale- 
yi'llowisli.     The  liyiioin-giuiu  of  tho  ^    ,-vry  niiudi  thickened.     Long. 


Corp. 


(1.1; 


Li 


il,  0.14— 0.1; 


SvN.    (jijiniiDjiti^rniis  rrasslciiiida  Lokvv,  Neuo  ]?eitr.  VIII,  ^.'J,  20. 

(Jrt'cn,  niodiTatcly  sliiiiiiifT ;   face  and  front  with  some  whitish 
dust  ;   ill  wi'll  itrcscrvcd  9  a  dclieatc  and  imio-coiorcd  pnbcsccnce 


can 


l)(;    seen   upon  the  lower  Jiart   of  the  fi 


ice 


Antenna'  red,  of 


very  iiu»derate  si/e,  the  tliird  Joint  at  the  end  r(»unded  and  infiis- 
eatcfl.  Arista  of  the  J*  with  a  short  but  distinct,  that  of  the  ? 
with  a  comparatively  lonjr  and  very  strikinu*  juiheseence.  ('ili<i 
of  the  inferior  orliit  black.  Thora.x  somewhat  dull  from  {rrayish 
d'ist.  'I'Ik!  hairs  U])on  the  scutelluin  delicate  and  ratlier  dilTi- 
ciilt  to  i>erceive.  ]Meura^  fi'ray,  their  whole  posterior  inaririii 
(epimera  inetuthoracica)  yellowish.  Venter  yellow ;  ujion  the 
anterior  seirmenis  of  the  ahdoineu  this  color  extends  somewhat 
upon  the  upper  side;  in  well  preserved  specinieiis,  however,  it  is 
c(Uicea]ed  l)y  a  whitish  dust  ;  in  the  9  this  yellow  eolorinp"  some- 
times extends  further,  so  that  there  is  upon  the  first  segment  a 
complete,  and  uixtn  the  second  an  interrupted  yellow  band.  Coxa' 
and  feet  ]iale-yeIlowish.     Tarsi  towards  the  einl  scarcely  a  little 


infiiscated.      Cilia  ol  the  tet-'iihe  lilack.      Win 


with  a  s 


liuhi 


vel- 


low-<rrayish  tiiifrc.  The  third  and  fourth  loiiii-itudinal  veins  to- 
wards the  end  almost  entirely  jiarallel.  The  hyjjopyjriuin  of  the 
^  uncomiiKuily  thickened.  The  very  small  crescent -shaped  lamelhc 
liave  a  yellowish  coloriiig  and  a  fringe  of  short,  delicate  and  sjjarse 
hairs. 

JJab.  New  York.     (Osten-Sackcn.) 


T 

I 


■'! 


22.  <w.  niiniltllA  Loew.  %  . — Viridis,  antennis  parvis  rufis,  pUniranmi 
niart^iiie  postico,  ventre,  coxis  peditmsqne  pallide  flavioantihus,  coxis 
anticis  denudatis,  hypopygio  non  iucrassato. 

Green,  the  small  antennse  red,  the  posterior  margin  of  the  pleura^,  the  ven- 
ter, the  coxa}  and  the  feet  pale-yellowish  ;  fore  coxa)  bare  ;  the  hy- 
popygium  not  thickened.     Long.  corp.  0.10.     Long.  al.  0.11. 

Svx.    (ii/mnoptert)Hs  miniitus  Loew,  Neiie  Beitr.  VIII,  3.'),  21. 

Green,  quite  In'ight,  face  with  a  dense,  front  witli  a  thin  whitish 
dust.  Anteuiiii}  browiiisli-red,  small,  the  third  joint  at  the  end 
dark-l;rowu.  Arista  with  a  short  but  distinct  ))ubescence.  Cilia 
of  the  inferior  orbit  black.     Thorax  a  little  dull  from  a  white- 


PARACMIS. 


97 


•iravish  dust.     ScutclIuiM  with  u  few  sliort  hairs.     Posterior  mar- 


Vnitcr  yellow.     On  the  anterior  sejr- 
I   n 


jiiii  of  the  i>leiira;  yelhtv 

iiieiits  of  the  alxloiiieii  the  lateral  iiiar<riiis  are  aL^^o  eolored  with 
yellow,  llypopyuiiim  of  the  usual  shape.  The  small,  lieiieate 
hiiuellic  yellowish,  sparsely  ciliated.  Co.xie  and  feet  wiiite-yellow- 
isli.  The  f<»re  eo.xa*  have  upon  their  aiiteri(»r  side  no  lilaek,  I»ut 
throughout  oidy  extremely  (hdieate  suiall  whitish  hairs,  so  as  tn 
appear  frlal>rous,  which  constitutes  a  very  strikiuff  character  of 
tliis  speeie.s.  The  tarsi  towards  their  end  are  scarcely  somewhat 
infuscated. 

JIah.   .Middle  States.     (Osten-Sackcn.) 

33.  IrJ.  ventral  is  Lofw.  %. — Viriilis,  modic.  nitens,  anteniiarnm 
articiilo  tiTtio  latiiiscMilo,  ri)tiiii  lato,  pleuraniin  inarginn  postico,  ventre, 
("oxis,  |>i'(lil)us(jue  palliile  llavis,  liypopygio  iiiarid  noii  incrassato. 

Oreo::,  ••Kidcratel y  shinintr,  thinl  joint  of  the  antennnp  rather  broad,  roiimled  ; 

posterior  niarpin  of  tlie  pifur.e,  venter,  coxa-  ami   feet  pale-yeliowisli ; 

hypopyiiiuin  not  thickened.     Long.  corp.  OA'.i — (1.14.     Long.  al.  O.l.'). 
Syx.    (iiiiiiiKi/itrniiis  vfiilnilif.  LiiKW,  Neue  Ueitr.  VIII,  3(5,  22. 

Green,  not  very  brij-lit.  Face  with  a  whitish,  front  with  a  pale 
yellow-urayish  dust.  Antenna'  brownish-red,  of  moderate  size; 
the  third  joint,  which  is  risimded,  is  rather  liroad  ;  arista  with 
a  rather  short  hut  distinct  pid»escence.  Cilia  of  the  inferior 
orbit  black.  Thorax  (piite  didl  on  acc(mnt  of  a  yellow-frrayish 
dust.  Scutellum  with  delicate  but  distinct  hairs.  The  entire  pos- 
terior mar<iin  of  the  i)leura'  yellow.  Venter  yellow.  Ilypopyijiuni 
of  the  usual  forni.  The  small  yellowish  lamclhe  of  middle  size, 
rather  sjiarsely  ciliated.  Coxa*  and  feet  pale-yellowish.  'i'he 
liair.s  on  the  anterior  coxa^  are  ]»artially  Ijlackish,  but  so  delicate 
that  they  mifrht  be  easily  overlooked.  The  tarsi  towards  their  end 
are  only  little  infuscated.  ("ilia  of  the  te<ruhe  black.  Wino-s 
with  a  yellow-ucayish  tiiiL^e;  the  third  aiid  fourth  longitudinal 
veins  parallel  towards  their  end. 

Hub.  Xew  York. 


Gen.  IV.    PARACLirS. 

When  I  adopted,  in  the  iifth  part  of  the  Nnir  lii'itri'Kjc,  the 
f^enus  G\jmno})li'rnu>t,  and  distin<ruished  it  from  the  relatecl 
jrenera,  it  was  done  merely  upon  the  basis  of  an  invest i<ratioM  (»f 
European  species,  so  that  I  had  only  these  species  in  view  when 

7 


08 


DIPTERA  CtF  NORTH  AMERICA. 


fPART  11 


;> 

;■ 

■' 

'■^ 

/,( 

j\ '" 

1  . 

•    ', 

'1 

i 

1 

■,' 

1  defined  the  fharacters  of  this  peiiiis  and  its  differences  from  tlie 
neif^lihoriiiff  jrenora.  America  jiossesses  species  whicli  necessarily 
come  within  tin;  ddinition  of  the  jrenus  (Ji/m))o/)tv?'n((n,  as  under- 
stoud  in  tiiat  i>ul)iication,  but  wiiich,  at  the  same  time,  diller  too 
mucli  from  all  oiher  species  of  this  frenus,  to  find  a  natural  jduce 
anion},'  them.  The  most  striking,  although  i)erhaps  not  the  most 
im])ortant,  character  wlscrel)}'  these  species  differ  from  the  others, 
is  the  course  of  the  'ast  scfrmcnt  of  the  fourtii  longitudinal  vein. 
At  or  Iteyond  its  middle  it  is  suddenly  deflected  anteriorly,  and  its 
enil  is  so  near  the  end  of  the  third  longitudinal  vein  that  the  first 
posterior  cell  a])pears  almost  closed.  In  order  to  separate  these 
sjx'cies  fr(»m  the  genus  (ri/mnoplemuti,  1  have  added  ahove  to  the 
characters  of  GijmnojiternnH  the  complete,  or  at  least  nearly  com- 
plete, parallelism  <,f  the  third  and  fourth  longitudinal  veins.  A 
more  minute  examination  of  the  species  in  (piestion  shows  that  they 
should  form  two,  or  perhaj>s  more  correctly,  three  groups ;  still, 
before  we  are  able  to  jut'ge  with  certainty  about  it,  our  as  yet  im- 
perfect knowledge  of  the  species  will  require  a  considerable  in- 
crease. In  the  m"antime,  however,  if  we  draw  our  attention  to 
the  clnracter  which  distinguishes  all  these  si)ecies  from  the  other 
fri/mu()}>fi'7')in>i,  that  is,  to  the  course  of  t'^e  last  segment  of  the 
fourth  longitudinal  vein,  we  will  soon  find  among  these  s})ecies 
two  principal  modifications  of  this  course.  In  one  case  the  deflec- 
tion of  the  fourth  segment  at  or  beyond  its  middle  takes  place  iu 
a  stt  p  curve  forward,  and  the  vein  then  runs  in  a  straight  direc- 
tion to  the  margin  of  the  wing,  which  it  reaches  very  near  tlie  tip 
of  the  third  longitudinal  vein.  In  the  other  case  the  last  segment 
of  the  fourth  longitudinal  vein  forms  beyond  its  middle  a  but 
slightly  rounded  angle,  and  thence,  in  the  form  of  a  curve,  ti.e 
concavity  of  •liich  is  turned  backwards,  it  runs  to  the  margin  of 
the  wing,  which  it  likewise  reaches  in  the  immediate  neighborhood 
of  the  third  longitudinal  vein.  Those  species  which  show  the  first 
of  the  above  mentioned  neurations,  ])ossess,  moreover,  many  other 
characters  in  common,  which  distinguish  them  from  the  spev'ies  of 
GynDwptemm,  and  thus  they  form  the  genus  I'riasfonevi'us.  A^i 
the  most  imi)ortant  of  these  characters  nmy  be  mentioned  the 
feathered  arista,  the  broad  face,  which  is  c<»mmon  to  both  sexes, 
strongly  convex  upon  its  lower  part,  and  provided  with  a  sliarp, 
curved  inferior  margin  ;  also  the  elongated  and  distinctly  j)eduncii- 
lated  hypopygium.     On  the  contrary  all  those  species,  iu  which  the 


I'AKACI.irS. 


!•'.» 


end  of  tlio  fourth  loiiiritudinnl  vein  forms  n  enrve,  tlie  concnviry  of 
which  is  turned  liiieivwnrds,  and  which  in  tliis  respect  dilVer  more 
tlinn  tlie  others  froni  the  species  of  (Ji/mnoptcrnuK,  i»p|»roach  thci.i 
very  oh)sely  in  the  structure  of  the  face,  and  are  easily  distin<ruislied 
on  tluit  account  from  tlie  species  of  Pcldf/loncKy'iifi :  tlie  structure 
of  their  face  would  be  indeed  altov:ether  like  tliat  of  the  species  of 
Gi/mn()jilrr»>if<,  if  the  face  was  not  sonu'what  less  'oroad  and  more 
narroweu  below.     The  structure  of  their  hypoityirium   also  ap- 
proaches more  to  that   of  the  species  (»f  (ripnnojjtcr)iii>i,  than  to 
yV/«x/o»c?/r?/s,  the  liypo})yfrium  not  bciufj  eloufrnted  aiul  beinp^ 
provided  with  a  shorter  jtedunde,  so  as  to  appear  sessile  or  almost 
sessile.     The  outer  ai){)endafres  of  all  the  species  have  more  of  the 
usual  form  of  a  shell  than  those  of  the  sjiecies  of  ri'l(ii</o)}riirii.<. 
While  there  is  a  ^^reat  uniformity  with  regard  to  all  the  above  men- 
tione<l  clmracters,  this  is  not  the  ease  w'th  the  structure  of  the 
antenna;.     In  both  species,  which  I  describe  below,  the  third  joint 
(tf  the  antenuie  is  rounded  and  the  arista  more  or  less  distinctly 
hairy,  but  not  feathered.     In  the  species  from.  Surinam,  which  I 
have  descril)ed  in  the  Wiener  Entomol.  Monafxrhr.  as  (Hi/mtiop- 
ternua  lenrospilns,  the  third  joint  of  the  antennas  is  loufrer,  (|uit(! 
distinctly  excised  on  its  upper  side,  and  has,  like  the  species  of  /'<•- 
Jaftto)}('nn(f<,  a  distinctlv  feathered  arista.     Whether  this  difjerence 
in  the  structure  of  the  antennic  is  sufficient  to  form  two  <j-enera  of 
these  s])ecies,  I  am  unable  to  decide,  on  account  of  the  scanty  ma- 
terial at  my  disposal.  l}ut  I  rather  iiicline  to  that  opinion.     J>oIi- 
chopus  hcteropterw<  Maccj.  undoubtedly  belonjrs  to  this  <>roi,p.  but 
whether  it  is  more  related  to  the  two  species  described  below,  or 
to  G.  lt'i(coxpilHi<,  cannot  be  decided  without  the  comjiarison  of  the 
specimen ;  however,  accordinor  to  the  statements  and  the  drawinj? 
which  Mr.  Macquart  furnishes  of  the  structure  of  the  antennif, 
the  former  seems  to  be  the  case.     Mr.  Bijrot  founde<l  ujioii  it  a 
separate  prenus,  which  he  calls  Pararh'inx,  and  distinutiishes  it 
from  the  jrenus  Gymnopternux  by  the  latter  having;  the  third  joint 
of  tlie  male  antenna;  sli<rhtly  excised  on  the  u])per  side,  niul  the 
fourth  lonjritudinal  vein  bent,  while  in  Paracleinx  f'e  third  joint 
of  the  male  antenmc  is  not  excised  on  the  up))er  side,  and  the 
fourth  lonpritudinal  vein  is  strouffly  bent.     My  experience  dues 
not,  as  yet,  allow  me  to  a<rree  with  this  mode  of  sididivision  ;  I 
therefore  cannot  adojtt  the  jrenus  Parnclcius  in  the  sense  of  Mr. 
Bigot.      Nevertheless,   I   see  no   inconvenience   in   reta'iiinji-  tlio 


V.  -l' 


■.■■\ 


'■•  Ji 


100 


niPTEIlA  OF  NORTH  AMKllICA. 


[part  II. 


'|.': 


newly  coiiKMl  name,  with  the  usual  latinizod  inodifiration  in  Para- 
vliun,  for  the  new  jxenus  whieh  I  intend  to  estultlish  and  to  define 
here.  As  our  prineipal  aim  at  present  is  an  availal>le  {reiierie 
distribution  of  the  already  known  North  Anieriean  species,  1  will 
merely  have  tiie  latter  in  view  in  estal)lishin}r  the  characters  of 
J'ararliuK,  and  leave  out  G.  leucox]tiluH  for  the  present.  The 
discovery  of  a  larj^er  numlter  of  related  species  will  have  to  decide 
whether  the  character  of  raraclhi>t  is  to  l»e  modified  so  as  to  admit 
species  like  G.  leucuiipilus,  or  whether  a  new  genus  is  to  be  founded 
for  such  species. 

The  following  are  the  characters  of  the  genus :  The  (irst  joint 
of  the  antennie  hairy  on  the  upper  siile  ;  third  jtdnt  of  the  antennie 
rounded ;  arista  dorsal,  with  the  ordinary  }>ubescence,  not  feathered. 
Face  of  very  moderate  breadth,  narrowed  towards  the  mouth,  not 
convex  in  its  lower  part  and  not  reaching  to  the  inferi<»r  corner  of 
the  eye.  The  lirst  Joint  of  the  hind  tarsi  without  bristles.  The 
last  segment  of  the  fourth  longitudimU  vein,  beyond  its  middle,  is 
bent  forward  in  a  rounded  angle,  thence  running  in  a  curve,  with 
the  concave  side  turned  backwards,  towards  the  nmrgin  of  the 
wing,  and  reaching  it  (piite  near  the  tip  of  the  third  longitudinal 
vein,  so  that  the  Hrst  posterior  cell  has  but  a  small  opening.  Hy- 
po|)ygiuni  entirely  disengaged,  not  prolonged,  with  a  very  short 
pedicel,  so  as  to  a[)i>ear  sessile  or  nearly  so ;  the  exterior  ajjpend- 
ages  lamelliform. 

The  characteristic  differences  between  Paraclius  on  one  side 
and  Gi/mnoiifernux  and  J'elastoneurtix  on  the  other,  will  be  easily 
understood  from  the  foregoing.  Besides  the  sj)ecies  of  the  latter 
two  genera,  there  are  those  of  the  genus  HercoKtomua,  which  re- 
semble the  species  of  Paraclius ;  but  in  this  genus  the  last  seg- 
ment of  the  fourth  longitudinal  vein  only  very  gradually  approaches 
the  third  longitudinal  vein,  without  any  vestige  of  au  angular 
flexure,  and  reaches  the  margin  of  the  wing  not  so  near  the  third 
longitudinal  vein. 

Only  American  species  of  Paraclius  are  as  yet  known.  The 
name  of  the  genus  (from  napo — xXftu,  I  close),  means  that  the  flrst 
posterior  cell  of  the  species  is  almost  closed. 


u 


1  i  * 


PAUACl.irs. 


lul 


TdhJi-  for  the  ileterminntlnn  of  thf  S/nrirs, 

r  Arista  with  long  liairs  ;  first  si-gnn^nt  of  the  costa  not  swollen. 
I  1  arcuatuB  /.»•. 

I  Arista  with  short  liairs  ;  first  segment  of  the  costfi  sfroiiiily  swo'Icm, 
I  -  albonotatuB,  n.  sp. 

I)psrrijiti(>n  of  the  Sperien. 

1.  P.  arc'liatllH  liOKW.      9' — Ol'scnre  virliiij^,  ju'dibus  flavis,  ex  parte 
fnsc'is,  alls  nigrican    i)us,  primo  cost."!)  seginento  iion  incrassato. 

1  ark  preen,   feet  yellow,  partially  dark-brown,  wind's  Mafkisli,  first  seg- 
ment of  the  costa  not  thickened.     Long.  corp.  0.12.     Long,  al.  0.11. 

Sy.n.   Ptlastoneiirus  urciiatus  Lokw,  Neue  Heitr.  VIII,  .'5!),  4. 

(ireeii,  l)ritrlit.  Face  narrow,  still  narrower  lielow,  covered  with 
thick  white  (hist.  Front  jrreen,  rather  (hill  IVoin  u  whitish  (hist. 
Anteiniie  eoniparatively  .sniall,  bhick,  tlie  third  joint  nmndcd. 
Arista  witii  coniiiarativi.'ly  ittn<r  liairs,  hut  not  feathered,  ("ilia 
of  the  inferior  ori)it  whitish.  The  upper  side  of  the  tli(»rax  is 
upon  the  iirst  two-thirds  of  a  dark  hntiize  color  and  less  hrijrht, 
upon  the  last  third  of  a  ina<rniticent  g'olden  frreeu  color  and  very 
hriglit  ;  the  triaufrnlar  inii>ressiou  on  each  side  near  the  transverse 
suture  is  thickly  covered  with  white  dust;  a  snudi  sput  in  the  vi- 
cinity of  the  ])osterior  c(trner  of  the  thorax  is  dusted  in  a  sinular 
numner.  In  hxjkinir  at  the  thorax  from  behind,  a  deep  black 
strij)e-like  double  s))ot  above  the  root  of  the  win^'  becomes  appa- 
rent. Scutellnm  rather  bright,  of  copi)erish  color  with  a  jrreen 
middle  line.  The  extreme  tips  of  its  lateral  corners  are  d«'ep 
black,  and  the  hairs  on  its  upper  side  are  jiarticidarly  distinct. 
Altdomeu  brijrht,  rather  dark  jrreen,  alonir  tli<'  incisures  blacker, 
the  lateral  niarjrins  of  the  single  sefrmeiits  with  not  very  distinct 
s)>ots  of  whitish  dust.  IMeune  frreenish-black,  and  ratlier  irray 
fi'om  a  thin  whitish  dust.  Fore  coxie  yellowish-brown,  towards 
the  tip  lighter;  middle  and  hind  coxie  as  far  as  the  tip  black. 
Feet  brownish-yellow  ;  fore  and  middle  femora  on  the  upper  side 
browni.sh,  hind  femora  rather  dark  brown  upon  their  wliole  latter 
l»art.  Hind  tibite,  with  the  exception  of  the  root,  dark  l)rown. 
Fore  and  mi(hlle  tarsi  from  the  tij)  of  the  first  joint  dark  brown; 
the  whole  hind  tarsi  blackish-browu.  Cilia  of  the  teguhe  black. 
"Wings  blackened,  towards  the  anterior  margin  darker  ;  the  last 
£<egment  of  the  fourth  longitudinal  vein  is  suddenly  bent  forward 


ii   j^ 

r.  '-  i 


:     f?l 

'    ■^:i 

;  1    1 

I      > 


'■'t 


'J 


102 


MI'TF.ilA  (»r  NdKTII  AMi;UIl'A. 


1 


[I'AIIT  II. 


almost  nt  a  riu'lit   uiijjlc,  and  this  scfjniciit  t'i)riii.s  u  curve,  (lio  con- 
vexity iif  \vlii<'li  is  turned  backwards. 
Ilah.   Cul.a.     (I'ney.) 

"Z,    I*.  allioiiotudlH,  n.  sp.      %    nml    9 .— Obxi-iiro   viriilis,   pi'ililma 
totis  iii^ris,  iilirt  iii^ricHiitilms,  |>riiii()  cont'n  dixti.uo  v.;l<l«)  intrassuto. 

Dark  green,  feet  ei.tirely  lilack,  wini?i»  blat'kish,  the  llrst   <f),'ineiit  <if  (lie 
I'tista  very  iiinch  tliickened.     LdUi^.  corp.  (1.17 — yK\H.     Long.  al.  ('.IT. 

I)ari\  frreen,  sometimes  rtiore  i)roiize-,a:reen.  i''aee  of  tlio  % 
narrow,  of  t  lie  9  a  little  broader;  in  both  sexes  it  is  covereil  with 
a  snow-white  dust.  J'alpi  brownisli-i)lack.  Antenna'  entirely 
black,  of  very  m<iderate  size,  the  third  joint  rounde(l ;  arista  with 
the  usual  short  pulM'scenee.  Front  covered  with  a  rather  densu 
white  dust.  Cilia  of  the  inferior  orl)it  whitish.  Thorax  dark  me- 
tallic ^M'cen,  sometimes,  with  the  exce]»tion  of  the  posterior  ]»arl  of 
the  upper  side,  of  a  dusky  bronze-color.  'I'he  pleura'  and  the 
trianjiuliir  lateral  impression  on  the  transverse  suture  are  covered 
Avith  a  Itriji'ht  white  dust.  Scutelium  of  the  same  color  as  the 
uitper  side  of  the  tliorax.  Al>d(imen  on  the  posterior  nnir^in  of 
the  siny:le  setrments  usually  rather  blackish-blue-^'reen,  upon  the 
remaininfr  part  of  the  seunicnts  more  golden-ureen  or  coppery; 
rn  the  lateral  nuirtrin  covereil  with  white  dust.  Ilypopyfriuni 
disenpi^red,  sessile,  ••■reenish-lthick  ;  Inmella'  only  of  very  moderate 
size,  rounded,  brownish-l)lack.  Coxte  and  feet  bla<  k,  the  former 
covered  with  black  hairs,  the  latter  with  a  f>-reenish  lustre ;  fore 
til>iie  only  with  a  simple  row  of  bristles  ;  middle  ami  hind  tibiae 
with  numerous  bristles.  Te<ridie  blackish-brown,  with  black  cilia. 
WiufTS  of  imalerate  size,  of  an  olonji-iited-oval  shape,  blackened; 
the  last  scfrment  of  the  fourth  loniritudinal  vein  al>out  its  middle 
is  bent  forward  nt  an  obtuse  an^Ie,  and  its  tip,  which  readies  the 
nmrjfin  <piite  near  the  third  loniiitudinal  vein,  forms  a  curve,  tlie 
concavity  of  which  is  turned  backwar(l>.  In  the  %  the  portion  of 
the  costa  which  lies  before  the  end  of  the  first  longitudinal  vein 
sliows  a  very  stron*;  swelling;  ia  the  9  this  swelling  is  mueli 
weaker,  Imt  still  of  a  rather  conspicuous  size. 

Hub,  New  Orleans. 


PKLASTONtl  HUM. 


103 


Uen.  V.    l*KI.AMTO.\i:illl  !4. 


The  characters  of  the  jfcniis  arc  the  lonowiii^j :  First  joint  of 
the  uiiteiiiiti!  short,  hairy  on  the  nppcr  side;  tliinl  joint  roinuh-*! ; 
arista  dorsal,  ilislinct I)  fealhered.  Face  in  both  sexes  coni|)ara- 
tively  broad,  upon  its  lower  |»art  stroii;ily  convex;  its  lower 
unir^in  is  sharp,  and  t'ornis  a  curve.  I'mhoscis  stouter  thxn  in 
(.ti/nniojilrnius,  and  approaching-  in  its  structure  the  species  of 
Mrilrlcnis.  The  lirst  joint  of  the  hind  tarsi  without  lirislles. 
The  last  seg^nu-nt  of  the  fourth  lonjiiiudiiial  vein  turns  forward  at 
or  beyond  its  middle  in  a  stron;;  curve,  and  runs  tlu'ii  almost  in  a 
strai^'ht  line  towards  the  nnirgin  of  the  win^,  which  il  reaches 
closely  in  the  vicinity  of  the  tip  of  the  third  lon<j:itudinal  vein,  so 
thai  the  lirst  posterior  cell  is  ahuost  closed.  'I  he  hyj)npyjriuin 
■IS  entirely  disenj^ajicd,  very  much  eloiijinted,  pednncnialed,  with 
lamelliform  bhu-k  a)>pendajfes,  which,  in  most  of  the  species,  have 
a  very  elonpited  form,  and  are  of  a  more  solid  suiistanee  than  in 
the  allied  jfcnera. 

The  next  related  jrenus  is  I'arncliiis.  The  diiTcrences  of  both 
have  already  been  detaile(|  alxtve.  J'tlunlom-urus  can  haruly  l)e 
mistaken  for  any  other  jrenus. 

As  yet,  only  American  species  of  Pi'los/oncurKx  have  been 
made  kin»wn.  Amoufj;  the  species  describ- d  by  former  authors, 
Dolit/iopus  UKiriih'ju'ti  Walk.,  and  />.  hi/'rons  Walk.,  seem  to  l»e- 
lonij  here.  The  name  of  the  jienus  (from  nfXaSi«,  I  approaeh,  and 
vivfioii,  the  nerve)  has  reference  to  the  position  ami  the  peculiar 
course  of  the  last  segment  of  the  fourth  longitudinal  vein. 


'')■ 


2 


Tithle  for  'lie  detennimittoii  of  the  Speciis. 

Cilia  of  the  infi-iior  orliit  lilatk.  2 

(.'ilia  of  tiiH  inft'rior  orliit  jiale.  4 

Thorax  with  a  largo  siM)t  of  wliite  dust  on  the  posterior  margin. 

1  longicauda  /.«•. 
Tliorax  witliout  a  spot  of  white  dust  on  the  posterior  margin.  H 

Wings  l)htckened.  2  lugubris  f^w. 

Wings  gray.  3  laetus  A«'. 

Fore  coxie  lilackened  at  the  basis.  4  vagans  /.«•. 

Fure  cuxic  uut  blackened  at  the  basis.  ^  cognatus  A'^'. 


■^TTTTr 


104 


IMPTKIIA  UF  M»KTII  AMIillK'A. 


[I'AUT  II. 


Si/ntimiilic  arroiiyemtut  uf  tht  S/ticitt, 

I.  Cilia  of  the  inffrior  orbit  Itlack. 

1.  longloauda  At.  D.  laatus  f.u: 

'^-  lugubris  Aw. 


II.  Cilia  of  the  inffrior  orltit  pal'). 
4.  vagans  Lw, 


ft.  oognatui  /.w. 


/trsrn'/itiiiti  of  ihf  S/itriis, 

I.  Cilia  of  tiik  infkiiior  ((Hhit  ulaik. 

1.  P.  loilfflt'aillla  I-oKW.  %, — A«'iUM)-iiii.'(T,  I'iiciH  arct'iitco  niicantp, 
Hul)  aiittiuniii  triuugulum  ni^TUiu  i^urt-iittt,  ciliis  ouulurum  iuluriurilui!) 
iiigris. 

Hroiize-Maik ;  face  with  a  Hilvery  liistri-,  witli  a  Maik  trianu'iilar  fpot 
UDilfr  the  aiiteniiif  ;  uilia  of  tiio  iiil'oiior  orbit  blui^k.  Long.  corj).  I). 17. 
Loiik;.  al.  0.  hi. 

Sy.n.   i'vlastoneuina  lomjlcunda  LoBW,  Neue  Heitr.  VIIF,  37,  1. 

Face,  fur  a  %,  extrciiu'ly  broad,  the  inrcrior  two  tliinls  of  it  an- 
stroll;;!}-  convex  and  liave  a  brijflit  silvt'ry-wliito  ivlli-ctioii,  wliii-li 
sliows  a  suUR'wliat  olive-brown  a|>))('araiice  only  in  a  ct-rtain  oi»- 
liqiK'  li;:lit  ;  tlio  ui»|tL'r,  flat  jiortiuii  (»f  tlie  face  lias  in  each  lower 
coviier  a  deep,  triaii^rular  spot  with  a  silvery  lustre;  that  trianu'ii- 
lar part  of  it,  which  is  not  covered  l)y  this  spot,  appears  deep- 
Ith'ck,  when  seen  from  altove ;  seen  frtjiii  lielow,  it  appears  less 
dark  and  somewhat  dusty.  The  lower  marjrin  of  the  face  is  very 
sharp.  Palpi  larjre.  on  the  outside  with  a  silvery-white  lustre 
ar.d  covered  with  black  hairs.  Front  shiniiijL!;  blackish.  Anteniiie 
brownish  Idack  ;  the  under  s'ide  of  the  first  and  second  joints 
brownish-red;  the  rountlcd  third  joint  rather  laru'c.  Arista 
rather  short,  very  much  thinner  towards  the  lip,  and  upon  the  last 
two  thirds  feathered  with  short  hairs.  Cilia  of  the  inferior  orliit 
black.  Thorax  bronze-black,  rather  shiiiinii:,  with  an  almost  imi»er- 
ceptible  white  dust  ;  the  upper  side  of  the  thi>rax  shows  live  spots 
covered  with  snow-white  dust,  namely  one  on  each  side  near  the 
transverse  suture,  one  in  the  shape  of  a  dot,  on  each  side  above 
the  root  uf  the  wing  near  the  posterior  corner,  and  iinally  a  hirjje 
triaufruhir  spot  iu  the  middle  of  the  hind  margin;  the  velvet-black 
strii)e-like  double  spot  immediately  al)ove  the  root  of  the  wiiigr, 
j-o  common  in   the  species  of  this   genus,  is  very  distinct  here. 


■"'> 


PEr.ASTONEiniB. 


105 


Toxir  nnd  pli'iinu  bliK-k,  with  a  Hilv«'ry  liistro.  Sculilliui*  with 
vi'lvi't-hhiclx  lati-ral  spots  niid  with  a  Vfivt't-lthifk  inii|tllt'->tripf, 
sinuotli  sti'cl-liliu'  lit'twi'cii  the  cnriicrs  and  tiic  niiddli'  si  ripe.  Ali- 
(iMiiifii  with  a  viidct  lustre.  ]|yp<ipy^:iiiiii  Idark,  upon  the  under 
siije  covered  with  siiow-wiiite  dust,  peduiieuhited,  not  very  stout, 
hut  very  htn^,  so  that  it  reaehes  as  tar  as  tlie  Itasis  of  the  alido- 
inen  ;  tiie  eouiparatively  sinalMauielhi'  hrownish-lihiek  ;  the  inte- 
rior appeiidii^es  sh>n(h-r,  black,  provided  at  the  tip  with  not  very 
numerous  hut  lon^  hairs  in  the  shape  of  a  hrush.  Feet  hrownish- 
yellow,  hind  t'eniora  hhickened  on  the  upper  side  of  the  extrenie 
tip;  the  liristles  on  the  upjter  side  of  the  tihiie  are  inserted  upon 
irreirular  small  hlack-hrowi:  spots;  tarsi  dark  hrown,  paler  at  the 
hasis.  Cilia  of  the  tejfuhe  hhick.  Win>is  comparatively  small 
and  narrow,  tinjred  with  hiackish-gray  and  darker  towards  the 
end  (d'  the  anterior  nuirgin. 

Jlolt.   New  York.      (Osten-Sncken.) 

Olwrrafion. — 'I'lii'  ])unctation  of  the  tihiie  may  remind  one  of 
Jhilii/iojiiift  )n(ii-ulijK's  Walk.  This  species  is  descrilied  as  only 
one  and  a  half  lines  long  and  hronze-green,  and  with  all  the 
femora  having  Idack  tips.  \o  mention  whatever  is  nnide  in  .Mr. 
Walker's  description  of  the  very  peculiar  structure  of  the  face 
and  id'  the  striking  white  spots  on  the  thorax,  which  are  peculiar 
to  l'il(istum'(trKf<  Inm/irdKih.  Under  such  circumstances  thu 
ideiitilication  of  these  two  species  is  impossilile,  the  more  so  as  all 
the  species  of  J'l  l(i)<fit)n'i(nis  are  very  much  alike  and  as  the  spots 
on  the  tihiu'  are  a  character  which  fre(piLntly  occurs  in  this  genus. 


!     tr4h. 


i(. 


'2.  I*,  llipilltris  LoF.w.     9. — Niirer,  tliorare  fusco-pollinoso,  ojiaco,  liliia 
ocuhiruiu  iiifciiorilias  iiitiris,  alls  iiiuiicantitius. 

Black,  tliorax  covcrtMl  with  brown  ilust,  dull ;  cilia  of  the  inferior  orbit 
black;  winiis  blackish.     Lone.  eoip.  O.ll.     Long.  al.  (».10. 

Syx.   J'^la.ttiiiifiirKs  lii'iiilirl.i  Lokw,  Neue  Keitr.  VIII,  38,  2. 

IMack.  Face  hlack,  with  a  whitish,  not  shining  dust,  and  with 
a  hlackish-l)rown,  not  well  delineil  middle  stripe;  upon  the  larger, 
iid'erior  part  hut  moderately  convex.  Palpi  rather  large,  hlack, 
on  the  outside  with  a  thin  whitish  dust  aud  hlack  hairs.  Front  didl, 
hrowidsh-hlack.  Anteniiie  reddisli-hrowu,  the  hasis  of  the  lirst 
and  the  larger  ]>art  of  the  third  ji)int  hrowinsh-hlack  ;  the  third 
joint  i.s  small  and  rather  rounded,  beset  with  short  hut  distinct 


'l!:i 


106 


Dll'TLIlA  OF  NORTH  AMKUICA. 


[part  ir. 


haws.  Arista  towards  tlio  tipluathcretl  with  shorthairs.  Cilia  of 
tJR'  inferior  orbit  black.  The  spot  on  each  sidf  near  the  transverse 
suture  *tf  the  thorax  is  covered  with  white  dust,  however  this  dust 
is  Mi)t  distinctly  seen  in  every  direction  ;  the  usual  d(ej)-ldaek 
stripe-shaped  double  spot  ininiediately  above  the  root  of  the  wing 
bcconies  distinctly  visible,  when  looking  at  the  thorax  from  be- 
hind ;  likewise  the  usual  little  white  spot  in  the  iieighljorhood  of 
the  hind  corner  is  sehh»ni  distinctly  seen  and  is  always  very  small. 
On  the  posterior  margin  of  the  th<»rax  there  is  no  spot  with  white 
dust.  Scutellum  bluish-black  with  velvet-black  lateral  corners, 
ill  well  preserved  specimens  there  is  a  miildle-stripe  with  grayish- 
white  dust.  I'leurte  black,  giiiy  t)n  account  of  a  thin  whitish 
dust.  Al)domen  bronze-black,  each  segment  on  the  lateral  margin 
with  a  small  spot  covered  with  white  dust  and  not  visil)le  in  every 
dire<'lion.  Fore  co.xiu  brownish-yellow,  with  an  almost  imper- 
cepliljle,  very  thin  covering  of  white  dust.  Middle  and  hind  coxa' 
black.  The  color  of  the  feet  is  rather  varial)le  ;  usually  they  lu'o 
yellowish-brown,  the  upper  side  of  the  anterior  femora,  the  tip  of 
the  hind  femora,  likewise  all  the  tibiie  atid  tarsi  bhick-brown  ; 
111' vert heless  there  are  si)ecimens  in  which  they  are  more  of  a 
brownish-yellow  color  and  where  the  tip  of  the  femora  and  the 
tarsi,  with  the  exception  of  their  roots,  are  blackish-brown,  while 
the  upper  side  of  the  tibiie  is  indistinctly  sjxjtted  in  consequeiict! 
of  the  brownish  color  of  the  places  of  insertion  of  the  bristles. 
Cilia  of  the  teguhe  black,  llalteres  blackish.  Wings  rather 
small,  narrowed  towards  the  bnsis,  distinctly  blackened,  darker 
towiinls  the  iinterior  nnirgiii  ;  in  more  faded  specimens  dark  mar- 
gins appear  around  the  veins,  as  is  also  the  ease  ia  the  other 
species  of  the  same  genus. 

Jlab.  Trenton  Falls,  >'.  V.     (Osten-Sacken.) 


3.  I'.  Ijrtlis  Lt'Kw.  %. — Viriili><,  ciliis  oculoruin  inforioribua  nigrLs, 
tidiiti-  ft  ilimidio  tlioracis  i)ti>:t'.'rioie  violaueis,  alis  ex  fusco  cinereis. 

Cii'Hii,  lilia  of  tiie  inferior  orbit  l)lack  ;  front  and  hind  part  of  the  thorax 
violet  ;  wings  brownisli-gruy.  Long.  corp.  O.l'J, — 0.13.  Lor,j  al.  0.1- 
—(MS. 

Svs.  J'lldstuiimnis  h'tug  Loew,  Neuo  Beitr.  VIII,  38,  3, 

l)!irk-gr<'en,    rather   shining.      Face    considerably   l)road    and 
covered  with  a  dense  snow-white  dust,  the  inferior  third  convex. 


PELASTONELRrS. 


101 


as 


l'al|)i  of  moderate  size  and  y(!llt)\visli  color,  covered  on  the  outside 
witli  snow-wliite  dust.  Antennse  yellowish-red,  thf  third  joint  a 
little  lonjrer  than  broad,  at  the  tip  altogether  rounded,  its  apical 
half  hlackish-hrown  ;  arista  towards  the  tip  rciillirrid  with  short 
hairs.  Cilia  of  the  inferior  orl>it  hlack.  Front  violet,  soinetiines 
almost  steel-l)lue.  I'ltju'r  side  of  the  thora.x  jrreen  with  a  thin 
gray-brownish  dust,  ujton  the  larger  portion  of  the  posterior  part 
violet  ;  the  spot  on  each  side  of  the  suture  is  covered  with  white 
dust  ;  the  usual  deep  black,  stripe-shai)ed  donble  spot,  immedi- 
ately above  the  root  of  the  wing  is  very  distinct  ;  thf  small  dot 
of  white  dust  in  the  vicinity  f  tlie  hind  corner,  however,  is  seldom 
distinctly  visible  ;  on  the  posterior  nuirgin  of  the  thora.x  there  is 
no  spot  of  while  dust.  Scutellum  shiidng  black-green  with  deep- 
black  lateral  corners;  oidy  in  faultless  specimens  there  is  a  middle 
stripe  of  white-grayish  dust,  surrounded  by  a  more  black  c<»lor- 
ing.  IMcuriC  black,  gray  on  account  of  whitish  dust.  Kach  seg- 
ment of  the  abdomen  has  on  the  lateral  margin  a  spot  of  white 
dust,  wiiich  is  not  very  sharply  deliiied,  and  the  sixth,  snndl  seg- 
ment, is  entirely  covered  with  whitish,  dust.  llyiKipygium  shortly 
])edunculate(l,  greenish-black  ;  on  the  under  side;  gray  from  pale 
dust;  it  reaches  with  its  tijy  as  far  as  the  middle  of  the  abdomen; 
the  long  browidsh-black  lamelhe  are  luirrow,  at  the  end  gently  bent 
upwards,  reaching  the  basis  (»f  the  abdomen;  the  slender  interior 
ai)pendages  are  also  blackish-brown,  beset  at  the  tip  with  a  few 
long  hairs.  Fore  co.xte  yellowish,  middle  and  hind  coxa;  blackish 
almost  as  far  as  the  tip.  Feet  i»ale-yellowish  ;  the  tiji  of  the  hind 
femora  is  not  of  a  dark  color,  and  the  bristles  on  the  upper  side 
of  the  tibia;  are  not  inserted  on  dark  sjiots  ;  middle  and  hind  tarsi, 
with  the  except  ion  of  the  roots,  black-brown  ;  fore  tarsi  brown 
oidy  at  the  tip.  Cilia  of  the  teguhe  black.  Wings  with  a  more 
lu'ownish-gray  than  blackish-gray  tinge  aiul  darker  towarils  the 
anterior  margi.i. 

Ikib.   (Jeorgia;  District  Columbia.     (Osten-Sacken.) 


m 


fA 


II.  Cilia  of  the  infekiok  ounix  i'ale. 

4.  P.  varans  Loew.  %  mid  9* — ^l>f'iiii'«  viridis  v»'l  JiiL'ro-spnens ; 
aiiteiUKiruii:  basi  iiita,  ciliis  oiulorum  inteiioribus  pallidis,  coxis  aiiticis, 
excejito  apice,  nigris,  alls  cinerei.s. 

Dark-green  or  bronze-black  ;  the  root  of  the  autenuae  red  ;  cilia  of  tlie  iu- 


.i 

1. 

■  f 

> 

1C8 


PIPTKRA  OF  NORTH  AMERICA. 


[part  11. 


•'•rr 


ferior  orbit  pale  ;  fore  coxve  with  the  exception  of  the  tip  black  ;  wings 
gray.     Long.  corp.  0.14— O.lf).     Long.  al.  0.15. 

Syn.  J'clastoneiirus  vugaiis  LoBW,  Neue  Beitr.  VIII,  39,  .'5. 

Dark-frrcoii  or  Jilackish  broiizo-colorcd,  moderately  sliiiiiiifr. 
Faee  broad,  with  a  snow-white  dust,  in  the  9  with  a  broad  {trav- 
Itrownish  middle  strii>e,  which  is  wantinj;  in  the  J'  ;  its  lower  part 
convex.  Palpi  rather  larjre,  ])lackish,  yellowish  at  the  ti)),  on  the 
outside  covered  with  a  dense  snow-white  dust  and  black  hairs. 
Front  covered  with  a  brown  dust,  sel(h)ni  entirely  ooneealiiifr 
the  jrround  color,  which  is  steel-blue,  excejjt  in  the  vicinity  of  the 
upper  corners  where  it  is  violet.  AntenniL'  not  very  lonjr,  the 
third  joint,  however,  which  is  rounded  and  distinctly  hairy,  is 
rather  larjre  ;  their  C(dor  is  red  ;  the  up|)er  side  of  the  first  and 
the  greater  part  of  the  third  joint  are  black-brown  ;  sometimes  the 
upi)er  side  of  the  second  joint  has  the  same  color.  Arista  feath- 
ered with  rather  long  hairs.  Cilia  of  the  inferi(»r  orl)it  whitish. 
The  color  of  the  upper  side  of  the  thorax,  in  recently  excluded 
specimens,  is  more  jrreen,  and  shows  then  two  lonu'itudinal  lines 
of  a  violet  color,  which  increase  in  breadth  backwards  and  become 
visibly  divergent ;  in  more  faded  si)ecimeiis  this  color  is  more  dark 
lironze-black,  and  of  the  two  violet  longitu<linal  lines  oidy  the 
hind  ])art  is  often  ])erceptiblc,  which  then  l)ecoines  more  extended. 
The  s])ot  of  white  dust  on  each  side,  near  the  suture,  and  the  usual 
deep-l)lack  double  sjjot  immediately  above  the  root  of  the  wing,  are 
very  striking;  ujwn  the  hind  corner,  which  is  of  a  brighter  green 
color,  there  is  a  spot  of  white  dust  in  a  diagonal  direction  ;  how- 
ever, it  is  very  dillicult  to  perceive.  The  extreme  tip  of  the  lateral 
corner  of  the  scutellum  appears  black,  the  elevated  middle  stri))e  is 
usually  green,  and  the  slight  depression  on  each  side  of  the  latter 
more  bronze-colored.  I  cannot  perceive  any  hairs  u])on  the  sur- 
face of  the  scutellum.  Abdomen  bronze-green,  often  somewhat 
copper-colored  ;  the  white  dust  in  the  vicinity  of  the  lateral  mar- 
gin does  not  form  any  distinct  spots.  Coxte  lilack  with  a  bright 
snow-white  lustre ;  fore  coxie  yellow  at  the  tip  to  a  rather  large 
extent,  the  middle  and  hind  ones  oidy  to  a  very  small  extent. 
Feet  somewhat  brownish-yellow;  fore  tarsi  only  at  the  tij),  middle 
and  hind  tarsi  from  the  ti])  of  the  first  joint,  blackish-brown.  Cilia 
of  the  tegula3  black.  Wings  in  recently  developed  specimens 
slightly  tinged  with  gray,  in  faded   ones  visibly  darker.     The 


m  ^ 

I 

a'H''  ■!'■ 

MS-    :J 

viil 

TACIIYTRECIIIS. 


100 


clonjralcd  niul  slondorliypojjvjriuiu  is  pcdunoiilatod  and  of  a  black 
color;  tilt'  loiifT  and  narrow  laniclke  are  ttf  an  c(|nal  breadth,  black, 
iVinircd  with  rather  lon<r  black  hairs;  the  interior  a[tpendages 
small,  without  hairs  at  the  tip. 

llnh.  .Middle  iStates.      (Osten-Sacken.) 

5.  P.  COKliatlls  LoKW.  9 . — Oliseure  spnens,  anteniiarnm  rufarura 
apice  fiisco,  filiis  oculoiuin  inferioribus  pallidis,  coxisaiitiris  totis"  Davis. 

Dark  broiiEH-colored  ;  the  tip  of  tlie  led  aiitennte  brown  ;  cilia  of  the  in- 
ferior orbit  pale;  fore  coxis  entirely  pale.  Long.  corp.  0.15.  Long, 
ab  0.15. 

Of  this  species  1  know  only  the  9,  which  is  a  little  larger  than 
that  of  the  precediiij;  species,  and  is  distinguished  from  it  by  the 
]»:iler  antennje,  by  the  hairs  of  the  feathered  arista  being  a  little 
longer,  l»y  the  dejjression  on  each  side  of  the  suture  of  the  thorax 
which  is  dusted  with  white  only  in  the  interior  corner,  and  l)y  the 
entirely  yellow  fore  coxa).  The  specific  distinctness  cannot  be 
called  in  doubt. 

JIab.  Middle  States.     (Ostcn-Sacken.) 


Gen.  VI.     TACIIl'TRECIirS. 

The  vertical  diameter  of  the  strongly  pubescent  eyes  is  very 
large,  and,  on  that  account,  the  head  very  high.  The  face  is  com- 
paratively narrow,  l)ecomes  gradually  broader  towards  the  mouth, 
and  reaches  altogether  the  lower  corner  of  the  eyes.  I'al|)i  of  very 
moderate  size,  also  in  the  female.  The  first  joint  of  the  antennse 
hairy  on  the  ufiper  side ;  the  third  joint  of  moderate  size,  rounded 
or  ovate.  Arista  dorsal,  with  an  almost  imperceptible  microscopic 
jniliescence  or  apparently  bare.  Cilia  o*"  the  whole  orl)it  particu- 
larly h'lig.  Feet  rather  slender  ;  femora  not  very  strong;  the  fore 
femora  towards  the  basis  a  little  thickened.  The  first  joint  of  the 
hind  tarsi  not  bristly.  Wings  comparatively  small ;  tlie  last  seg- 
ment of  the  fourth  longitudinal  vein  converges  gradnally  towards 
the  third  longitudinal  vein,  so  as  to  reach  the  margin  of  the  wing 
only  at  a  moderate  distance  from  this  vein  and  l)efore  the  tip  of 
t'.ie  wing;  upon  its  middle  there  is  a  more  or  less  distinct  flexure, 
wiiich  is  sometimes  more  considerable  in  the  ^^  than  in  the  9, 
but  is  never  very  strong.  The  hypopygium  is  entirely  disengaged, 
with  lamelliform  rounded  exterior  appendages  of  moderate  size. 


I 
'i 


no 


DIPTERA  OP  NORTH  AMERICA. 


[part  II. 


Tilt'  lial)itns  of  the  spocios  bcloiifriiijr  to  tlio  fjoniis  Tarht/fm-hiis 
is  vt'i'v  |M'culiar,  so  tliiit  tliey  caiiiiot  be  easily  mistaken  or  eon- 
founded -with  speeies  of  another  jrenus.  It  is  dillisult  to  jrive  <in 
adeipiate  exju'ession  t(»  such  jteeuliarities  of  the  habitus  in  the 
eharaeteristie  of  a  fi-enus.  All  that  has  been  said  above  about  the 
]>eculiar  structure  of  the  head,  deserves  in  this  respect  especial 
attention.  A  i)articiilar  mark,  which  distinjruishes  the  jyenus 
Tacln/hrrhufi  from  all  the  other  related  jrenera  is,  that  the  face 
reaches  as  far  as  the  inferior  corner  of  the  eye. 

Tlie  sjtecies  of  7'ncfii/'frcrhii>i  known  at  present  ai'c  found  in 
K.irope,  Asia  Minor,  Africa  and  North  America. 

The  name  of  the  «renus  (from  raxvt,  rai)id,  and  rp(%io,  I  run), 
has  reference  to  the  habit  of  many  species  to  run  along  sandy  and 
muddy  banks. 

Table  for  the  (htermliialiim  of  the  Sj)ecies, 
(  Antennae  for  the  most  part  dark  yellow.  1  moechus  /.»•. 


2 


t.  Antennio  altogetlier  black 

(  TibifB  brownish-yellow  almost  to  the  tip 


I.  Tibiie  black,  with  a  gieenisli  reflection. 


2  voraac  /-«•. 
3  angustipennia  Lie 


fpi/Htew(it!c  tirnirKjement  nf  the  Spr.cies, 

.    I.  The  second  joint  of  the  aiitennse  rudimentary, 

1.  moechus  Lw. 

II.  The  second  joint  of  the  antennae  of  the  usual  structure. 

2.  voraz  Lw.  3.  angustipennis  r.w. 

Descriptltni  nf  the  Sjiecies. 

I.  The  sepoxo  .toint  of  tiik  antennM'^  ri'Dimentakv. 

I.  T.  inoeclllli^  LoEW.      %  and  9- — Viridi-aeneus,  anteiuiis  maxima 

ex  jiarte  tlavis. 
^  .  Set»  antennalis  tenuissimie  apice  in  lamellam  atram  dilatato,  pedibus 

llavis. 
9  .   Seta  anteunali  simplice,  pedibus  nigro  et  testaceo  variegatis. 

Bronze-green,  antenn.-e  mostly  yellow. 

%  .  The  tip  of  the  very  slender  arista  enlarged  into  a  black  lamella,  fett 

yellow. 
5 .  Arista  simple,  feet  partly  black,  partly  brownish-yellow.     Long.  corp. 

0.24—0.2(5.     Long.  al.  0.22—0.23. 

Svs.    Tnchytrechus  moechus  Loew,  Neue  Beitr.  VIII,  40,  1. 


:.  ■'■-  ^  "■!  •*  r 


■ .  ii: 


TAniYTttEcms, 


111 


JA//c.   Fnc(!  very  loiisr  mid  narrow,  more  hroad  helow,  nliiiost 
frol(k'ii-y('ll(»w,    lint   without    any  lustr<\     I'alpi   small,   Ithickisli. 
AntenuiL',  in   conscciufnce  of  the    ru(lini<>ntary  condition  of  the 
second    joint,    apparently   two-jointed,    aj<    in    the    nial<'    of    the 
fronns    JldHrn'rmi.'^ :    the    first   joint    elonjrated    and     somewhat 
swollen,  of  a  brijrht  dark-yeljow,  hare  on  the  under  side,  on  tiie 
up|)or  side  covered  witii  hiack  hairs;  the  rndinnMital  second  joint 
of  the  same  color;   the  third  joint  also   extremely  snndl,  rounded 
or  somewhat  kidney-shaped,  hrownish-black  and  only  at  the  root 
yellow.      The  arista  very  slender,  bare,  half  as  lonjr  as  the  tiiorax 
and  abdomen  taken  to<retlier;   it  is  black,  oidy  at  the  extreme  tip 
white,  and  ends  in  a  small,  deep-black,  rather  rounded  lamella,  which 
is  white  at  its  extreme,  somewhat  attenuated,  basis.    Front  nu'tallic- 
green,  rather  without  lustre,  covered  with  brown-jrray  dust,  which 
is  oidy  visible  when  viewed  fmm  the  side.      Cilia  of  the  ]»osterior 
orbit    black    al)ove,    yellowisli    below.       Tlun-ax    metallic-prccii, 
usually  with  a  more  bronze  or  coj)per-colored  or  even  violet  mid- 
dle line  ;   it  is  rather  shininir,  covered,  however,  with  a  distinct 
browiMsh-yellow  dust.      Scutellum  ai'd   abdomen   have   the   same 
color  and  dusted  covering.      ]Iypo]»ygir.m   pedunculated,   black, 
ni)on  the  lower  side  more  black-green,  and  covered  with  yellow 
dust  ;  the  yellow,  rather  rounded  ianielhe  with  not  very  long  Idack 
hairs.     Pleune  with  a  covering  of  thick  dark-yellow  dust  upon 
bronze-green  ground.     Fore  cox:e  bright  yellow  with  almost  gol- 
den-yellow dust,  without  any  lustre  an<l  with  some  delicate  sparse 
black  little  hairs.      Middle  and  hind  coxie  blackish,  gray  on  ac- 
count of  a  yellowish  dust.      Feet  l)right  yellow;  middle  and  hind 
tarsi  from  the  middle  of  the  iirst  joint  brownish-black:   fore  tarn 
ahnost  impercej)tibly  flattened  ;   in  a  certain  direction  they  show 
a  bright  snow-white  lustre,  which  reaches  as  far  as  the  root  up(>ii 
the  fore  tibise.      Hind  femora  liefore  the  ti]»  with  a  single  Itristle. 
Cilia  of  the  teguhe  black.     "Wings  tinged  with  gray.      Tlie  tip  nf 
the  fourth  longitudinal  vein  is  nciii"  the  tip  of  the  third. 

Fcninle.  It  differs  renmrkalily  IVnni  the  male  in  color.  Fare 
very  narrow  for  a  female,  a  litth-  broa<ler  below,  pale  gray-ycl!ow- 
ish,  seldom  white-grayish,  and  then  at  least  upon  its  inferior  jpart. 
yellowish.  Pali)i  snndl,  l)lackish.  First  joint  of  tin-  antenna' 
nmch  smaller  than  that  of  the  male,  less  swollen,  and  moi'c  of  a 
reddish-yellow  color;  the  second  joint  of  the  sann'  color  and  !( ^s 
abortive  than  in  the  male  ;  the  third  joint  a  little  larger  than  ii;i;l 


•t 


t 


112 


DIPTKIIA  OF  NORTH  AMKIUCA. 


[part  TI. 


il'liffi 


i 


■    it 


••  "t  \  ■^  ? 


6;n 


of  tlie  inulc,  bro\vnish-l)luck,  riMUlisli-yt^lIow  only  on  the  inferior 
side  of  tlie  ))i»sis,  rounded.  The  liitiek  arista  ]»lain,  hare,  ffradiially 
thinner  tctwards  the  end.  Front  and  cilia  of  tin;  jxisterior  orl)it  the 
same  as  those  of  the  male.  Upper  side  of  the  thora.x  less  preen, 
more  hronze-eolored,  the  dust  more  brown,  and  the  middle  line, 
which  is  of  a  dilferent  color,  more  distinct.  The  alidonien  is  more 
of  a  bronze  color ;  the  dust  upon  it,  however,  is  rather  whitish. 
The  dust  on  the  jdcnra;  is  also  more  whitish  than  yellow.  The 
fore  eoxie  are  likewise  blackened  as  far  as  the  e.vtreme  tip  ;  femora 
green-black  ;  their  lij)  to  a  considerable  extent  with  a  yellowish- 
brown  tinge,  which  extends  further  on  the  lower  side  than  on  the 
upper  si<le  ;  hind  fenntra  Itefore  the  tip  only  with  one  bristle.  Fore 
tibiie  usually  brownish-yellow,  with  a  very  thin  whitish  pruinose 
covering  ;  fttre  tarsi  black,  with  the  exception  of  their  c  eme 
basis.  Middle  and  hind  tibia*  usually  dark  brown,  with  yellowish- 
brown  basis  and  with  black  tip.  ]Iind  tarsi  brownish-black.  Cilia 
of  the  teguhe  black.     Wings  clouded  with  blackish-gray. 

Hub.   Trenton  Falls,  X.  Y.     (Osten-Sacken.) 

Obticrvnfion. — A  genus,  based  upon  the  jtresent  very  remark- 
able species,  would  be  entitled  to  the  same  claims  as  the  genus 
I[alh>rire}-u.<,  with  which  it  nearly  coincides  in  the  structure  of 
the  antennai.  I  consider  the  estal)lishnient  of  such  a  genus  as  un- 
necessary, as  this  species  agrees  in  all  other  respects  with  the 
already  known  species  of  Tac/ii/lrvchus,  which,  however,  are  as 
yet  not  very  numerous. 

II.    Tr/E   SECOND   JOINT   OF   THE   ANTENN.E   OF   THE   USUAL 

STiaCTUUE. 

3.  T.  vorax  Loew.      %  and  9  • — -^neus,  aMomine  seneo-viridi,  anten- 

nis  pedibusijue  nigris,  fenioruin  apice  tibiisque  prteter  apicem  flavia. 
%  .  Apioe  alarum  guttil  caiidiild  niaiulaque  adjectd  alia  ornato. 
5  .  Ali.s  immaculatis. 

Bronze-colored.  al)d()inen  bronze-green,  antennre  and  feet  black,  tip  of 
femora  ami  tbe  tibi;i>,  with  the  exception  of  the  tip,  black. 

%  .  Tip  of  the  wings  with  a  snow-white  drop,  and  with  an  adjoining  deep- 
black  spot. 

9  .  Wings  spotless.     Long.  corp.  0.26— 0.27.     Long.  al.  0,23— 0.24. 

Syn.    Tachytrechiis  vora.v  LoEW,  Neue  Beitr.  VIII,  41,  2. 

Face  narrow,  but  considerably  broader  than  that  of  the  jircvious 


TACIIYTUECIirS. 


113 


f!))(>('i('s,  bnmilcr  iiifcriorly,  in  hotli  sexes  covered  witli  a  ymlo  yel- 
liiw  (lust,  and  without  lustre.  J'aljii  small,  l)Iaek.  Antenna)  of  the 
usual  t'orin,  Itlaek.  Arista  in  l)oth  sexes  i)Iaiii  and  Itaro.  Front 
covered  with  a  dense  yellow  or  l)rown  dust.  Cilia  of  the  jiosterior 
orbit  above  black,  below  white.  U])]»er  side  of  the  thorax  with  a 
gray-yollowish  or  l)n»wnish-yellow  dust  upon  a  luetallie-frreen  or 
partially  co])i>er-coli)red  and  lustrous  frround,  very  dull.  The 
seutellum  luis  a  similar  colorinjr,  still  its  ground  color  can  some- 
times 1)0  distinctly  recognized.  Abdomen  green  and  coppery, 
dull  with  a  gray-whitish  <lust.  Pleura^  and  coxa^  grayish-green, 
on  account  of  a  whitish  dust  upon  green  ground.  Femora  dark 
metallic-green,  thinly  pruinose  with  whitish,  their  tip  brownish- 
yellow ;  liind  fenntra  before  their  tij)  with  a  row  of  four  bristles; 
tibiio  browiush-yi'Uow  ;  the  tip  of  the  fore  and  hind  til)ia'  blackened, 
tl.e  tip  of  the  middle  tibiie  usually  only  l)rowii.  Tarsi  Idack,  ])laiii 
also  in  the  male;  the  fore  tarsi  usually  brownish-yellow  only  at  the 
extreme  root,  the  middle  tarsi,  however,  brownish-yellow  up(tn  the 
lirst  half  t»f  the  first  joint.  Cilia  of  the  teguhe  black.  Wings  of 
the  male  narrow,  hyaline,  scarcely  tinged  with  gray,  at  the  tip  with 
a  small  spot,  the  first  two-thirds  of  which  are  deei)-black,  the  last 
tliird,  however,  ajipears  snow-white  when  seen  against  tlie  light. 

ings  of  the  female  not  quite  so  narrow  as  those  of  the  ^,  dis- 
tinctly tinged  with  gray,  with  a  slight  dark  shadow  around  the 
hind  transverse  vein.  The  end  of  the  fourth  longitudinal  vein  in 
both  sexes  is  less  approximate  to  the  end  of  third  longitudinal 
vein,  than  in  the  previous  species.  The  short  jx'dunctdated  hy- 
popygium  of  the  ^  is  black,  upon  the  inferior  side  more  greenish- 
black,  but  gray  from  a  pale  dust;  the  lamelhe  are  black,  of  mode- 
rate size  only,  rather  rounded,  and  covered  with  black  hairs. 

Bah.  District  Columbia.     (Osten-Sacken.) 


' 

jf 


pf 


3.  T.  ansnstipeniiis  Lorw.      %. — Viridis,  antennis  niu'i-is,  ppftil)U3 
totis  ex  viridi  uigris,  alls  iiuiiiaculatis,  basim  Vfisus  attemiatis. 

Green,  anteiinre  black  ;  the  whole  feet  greenish-l)lack  ;  wiusrs  spotless,  nar- 
rower toward.s  the  l)asi'i.     Long.  corp.  0.22.     Long.  al.  (Ml). 

Syx.    Tiichijtrvihus  (ingustijxinils  LoKW,  Berl.  Knt.  Zeit.  VI,  213,  ()4. 

Green  and  but  little  shining,  on  account  of  being  rather  densely 
covered  with  a  fine  dust.      Palj)!  black,   with  a  gray-yellowish 
dust.     Face  pale,  oehre-yellow,  dull.     The  rather  small  antennae 
8 


i      i 


I'  •; 


r-  t^' 


m 


lir 


f 


lU 


diptf.ua  op  north  amfrtca. 


[part  it. 


-.Si; 


•'i  V, 


liliH'k.  Front  dull  from  ln'inj;  rovcrod  witli  an  opliro-yollow  dust. 
Ciliii  of  tho  lateral  and  inferior  orltit  whitish.  The  ui)iH'r  side  of 
the  thorax  is  eovered  witli  a  frrayish  ochre-yoUow  dust,  so  as  to 
make  the  frreen  ^n-ound  eolor  lait  little  ai)i)arent ;  upon  its  middle 
there  are  two  hrown  longitudinal  lines,  which  diver<re  a  little  Iteliind 
and'  are  very  mueh  shortened ;  some  portions  of  the  usual  lateral 
stri))es  are  also  visible,  and  the  sin<^lo  bristles  are  inserted  ujton 
lirownish-blaek  spots.  Seutellum  dull,  usually  more  brown  than 
tli(!  upper  side  of  the  thorax.  Pleune  jrreenish-^ray.  Abdomen 
green,  eovered  with  a  rather  thick  whitish  dust,  wh'"h  gives  it  a 
somewhat  clieekerod  a})pearancc ;  viewed  from  another  point,  the 
nnddle  line  and  the  posterior  margins  of  the  single  segments  ap- 
])ear  almost  ))lack.  Ilypopygium  Idaek,  with  whitish  dust  ;  the 
lamellic  arc  of  moderate  size,  rounded  oval,  with  short  hairs, 
which  are  black  on  the  upper  and  ajiical  nmrgin,  and  whitish  on 
the  lower  margin.  Coxa;  black,  with  yellow-whitish  dust ;  fore 
coxa;  beset  with  extremely  short,  delicate  and  sparse  hairs ;  be- 
sides, on  the  inner  side  of  their  basis  there  are  a  few  stiff  l»lack 
hairs,  and  towards  the  tip  a  few  black  bristles.  I*'eet  black  ;  fe- 
mora and  tibitu  with  a  metallic-green  lustre  ;  on  the  front  side  of 
the  hind  femora  there  is  a  single  black  bristle,  rather  distant  from 
the  tip ;  very  characteristic  are  the  bristles  on  the  ujijjcr  side  of 
the  hind  tibiie,  which  have  shorter  bristles  in  the  vicinity  of  the 
basis  and  a  longer  one  near  the  tip,  otherwise  of  the  usual  shape; 
U])()n  the  middle,  however,  there  is  a  row  of  three  solitary  remark- 
al)ly  flattened  bristles.  All  the  tarsi  jjlain.  Cilia  of  the  tegiiia^ 
black.  Wings  narrow,  towards  the  basis  still  more  mirrowed, 
grayish-hyaline;  the  second  portion  of  the  marginal  cell  more  dis- 
tinctly dusky,  the  posterior  transverse  vein  with  a  somewhat 
darker  margin  ;  the  costa  distinctly  thickened  upon  the  middle  of 
its  first  segment. 

Hub.  District  of  Colund)ia.     (Osten-Sacken.) 


1: 


Gen.  VII.     ORTHOCHILE. 

The  following  are  characters  of  the  genus  Orthochile  :  Probos- 
cis slender,  elongated  and  directed  straight  downwards.  I'alpi 
likewise  very  elongated.  The  first  joint  of  the  antenna?  distinctly 
hairy  on  the  ui)i)er  side,  the  second  transverse,  the  third  not  elon- 
gated.   Arista  dorsal,  with  an  extremely  short,  almost  impercei)ti- 


OUTiroCIIir-K — SYliKSTIlOMA. 


115 


lilc  inicrospojiic  itubcsccncc.  TIio  iiitVridr  corner  of  the  eve  <l:s- 
tiiii'tly  iHtidornl  liy  tlic  iiiin-ow  cliccks.  llypopy^i'imu  entirely  (li>- 
,.|iu;m-('il,  sessile,  its  exterior  iijtpenduii'es  liiiiieilit'onn.  The  first 
joint  of  tin.'  liind  tarsi  witlnir.t  In-isties.  Tlie  lust  sejrnieiit  of  tiio 
fiirtli  lonu'itndimil  vein  converu'es  towunls  tin-  tliinl,  iiltlioiii:-li  lint 
liraihiiilly,  still  snilieiently  so  ns  to  I'eiu-li  the  niiiru'in  of  the  winjr 
(jiiite  fur  fnnii  its  tip,  in  the  iininedinte  vicinity  of  the  tip  of  the  third 
Innu'itndinal  vein.  The  whole  structure  of  tlio  liody  approiiches 
rnther  closely  that  of  the  sp<'cies  of  J/rrrostiiDiii.t,  still  the  species 
of  Orlhufltili'  distin^'uisli  themselves  sutliciently  by  the  extraordi- 
nary elonu'ation  of  the  proboscis  and  of  tin-  palpi,  and  by  the  j)re- 
seiice  of  narrow  cheeks;  Ix-sides,  the  tips  of  the  third  and  fourth 
lonu'itinlinal  veins  lie  more  closely  toj;'etlier  and  farther  from  the 
tip  of  the  winu',  than  it  is  the  case  with  any  of  the  sjiecies  of 
I/i'rr()sf<ti))iifi.  The  described  species  of  this  u'cnus  are  found  iu 
Europe  iind  in  Asia  Minor.  The  North  Ainericau  species,  which 
.Mr.  Walker  described  as  Orthocliilc  dcrcmpla,  cannot,  hy  any 
means,  l)e  an  Ortliodnlc,  as  its  arista  has  an  apical  jxisition.  In 
what  n'cnus  it  is  to  Ite  located,  or  whether  a  new  jii'eiius  is  to  be 
created  for  it,  cannot  be  determined  from  the  very  imperfect  state- 
ments of  Mr.  AValker,  as  he  does  not  even  state  the  sex  of  his  spe- 
cimen, nor  whether  the  first  joint  of  the  antenmo  is  l)are  or  hairy, 
whether  the  lirst  joint  of  the  hind  tarsi  is  bristly  or  without  'oris- 
tles,  ami  whether  the  fourth  longitudinal  vein  converges  towards 
the  third  or  not. 

The  name  of  the  genus  (from  op^o?,  straight,  and  x^i-ko^,  the  lip) 
has  reference  to  the  form  of  the  proboscis,  l)y  which  the  species  of 
this  genus  can  easily  be  distinguished. 


A.^^lllPwl 


Gen.  VIII.     SYBISTROmA. 


The  following  are  the  most  important  characters  of  the  genus 
Si/hislronia :  Face  not  reaching  as  far  as  the  lower  corner  of  the 
eye.  very  narrow  in  the  nmie,  very  broad  in  the  fenuile.  The  lirst 
joint  of  the  antenna' distinctly  hairy  on  the  U})perside;  the  second 
joint  of  the  antenna?  transverse;  the  third  narrow  and  somewhat 
long  in  the  male,  broad  and  short  in  the  female.  Arista  snb- 
api<'al  ;  in  the  male  it  is  very  long,  its  lirst  joint  longer  than  the 
second  and  thickened  at  the  end  in  the  sluipe  of  a  knot  ;  the  second 
has  at  its  end  a  lamelliforni  enlargement.      Seutellum  very  dis- 


u 


,1-,-! 


mwm 


ilili 


i  ti'. 


no 


mPTERA  OP  NORTH  AMKRICA. 


[part  tr. 


tiiictly  Imlry.  IIy|i()|)yj,'imii  t'litiroly  (lis('ii,u-a}r('(l,  on  ii  sli(trt  |>t'- 
(luiiclo;  its  oxtorior  ajipoiKlajiCS  hiiiicllirurm.  'I'lic  lirst  joint  ul' 
tilt'  iiiiid  tursi  without  bristles  I''irst  posterior  ct'll  narrow, 
towards  its  end  very  narrow;  nevertiu'less  tin'  last  sejrnient  oltlic 
fonrtli  Ion};itudinul  vein  only  very  gradually  a]»i»roachos  llio  third 
ion^ituilinal  vein. 

The  next  related  ji:oncra  arc //c/ros^^m ((x  and  Ilii/>ojihi/lli(ti  ,- 
their  speeies  were  fornutrly  located  with  Si/in,'>ti'oina.  Frtnu  lioih 
these  p'uera  Sijhifttroind,  dilVers,  besides  the  peenliar  structure  of 
the  antennit'  of  the  nuile,  by  the  very  distinct  hairs  on  the  scutel- 
luni. 

'Ihis  (renus  was  hitherto  c(»nfincd  to  the  Fuirojiean  Si/hiaf/'dnia 
luxh'roj'iu'x,  uidess  perhaps  Si/hidroma  JiiiJ'oiirii  belouffs  to  it. 

Tiie  derivation  of  the  name  of  this  genus  is  not  clear  t<t  me. 
That  it  should  be  derived  from  ai-iivv.,,  the  spear,  and  arp^jfia,  the 
couch,  is  not  |)robable,  ut  least  it  would  then  be  a  very  unsuccess- 
ful composition. 

Gen.  IX.     IIEUCOSTOIViriii. 

I  have  established  the  genus  Jfcrcoxtomui^  in  the  fifth  numlter 
of  the  "  Neue  Jieitrdye,^^  upon  the  species  Sifliis/ronia  cirdfcr 
lln\.,  fuli'icaudis  Walk.,  and  loiifji  cent  via  Loew.  Th.'se  species 
agree  in  the  following  characters  :  in  the  distinct  j)uI)esceMce  of 
the  otherwise  i)Iain  arista;  in  the  structure  of  the  ju'oboscis  ;  in 
the  distinct  hairs  upon  the  surface  of  the  suctorial  fl!ij)s ;  in  the 
glaln-ousness  of  the  scutellum,  and  in  the  apparently  sessile  hy- 
popygium  of  the  male.  The  last  of  them  approaches  the  species 
of  llijpophijUus  very  much,  and  shows  some  marki'd  dill'ercnccs 
from  the  two  first,  so  that  their  consolidation  into  one  genus  may 
1»e  considered  as  provisional,  and  will  certainly  have  to  be  modified 
when  a  more  considerable  number  of  sjtecies  will  l)e  known. 

In  order  to  give  more  homogeneity  to  the  genus  (lymnoiiternuK, 
it  was  necessary,  as  I  have  remarked  l)efore,  to  exclude  all  those 
species  the  third  and  fourth  longitudinal  veins  of  which  are  de- 
cidedly (H)nvergent.  These  species,  however,  approach  the  above 
named  species  of  Hercostomux  more  than  the  si)ecies  of  any  other 
genus.  1  see  no  difliculty  at  present  to  unite  them  with  the  genus 
Ifrrroxlomiis,  whicli  is  not  ripe  as  yet  for  further  subdivision  on 
account  of  the  insufficiency  of  our  knowledge  of  its  species. 


1, 

5^ 


'  ■  ^f 

m 

A; 

\ 

\ 

'  I 

HEUCOSToMrB. 


in 


Till."  cliiiriK'tcrs  of  tlio  frt'iius  inay  Itc  HtTiiicd  ns  follows:  An- 
tciiiiii'  of  urdiiiury  striiclurc  ;  tlu;  lirst  joint  hairy  on  the  iipitcp 
side;  tlic  second  joint  of  tlu'  antt'tiiiu'  transverse;  the  third 
joint  not  ehtii<iated ;  arista  dorsal,  of  llie  usual  plain  stnu'turo. 
Sciitelhnn  without  hairs.  l''a<'e  init  reaehinjf  as  far  as  the  iu- 
fcrior  orl»it.  IlyiMipyninni  (»n  a  very  short  pednnele.  so  as  to 
appear  sessile  ;  exterior  appendap'S  lanielliforni ;  interior  append- 
aucs  hut  little  tleveloped.  Tlii'  lirst  joint  of  the  hind  tarsi  without 
liristles.  Tilt;  lirst  posterior  cell  narrowed  towards  its  end;  the 
last  seuiiKMit  of  the  fourth  lon^itinlinal  vein  only  gradually  ap- 
jtroaelies  the  third  loiiifitudinal  vein. 

The  dilferenees  from  the  fi'enera  <ii/iiini)/ilvrnu!<,  with  its  third 
and  fourth  lonjritudinal  veins  parallel,  from  I'rl(islniiciinii<  with 
its  feathered  arista  and  the  fourth  loniritudinal  vein  stronjrly  in- 
ducted forwards,  /'arai'liux  with  the  end  of  the  fourth  lonj-itu- 
dinal  vein  aniiidarly  iidlected  forwards  and  then  runninj;'  towards 
the  mar^'in  of  the  win,tr,  in  the  shape  of  a  seu'nient  of  a  circle,  are 
self-evident.  The  species  of  JIcrconlonKis  dilfer  from  thoso  of 
JlijjiophijUufi  by  their  arista,  which  is  plain  in  Itoth  se.xes,  hy  tho 
apiiareutly  vsessile  hypopyyium  and  l»y  the  lesser  development  of 
its  interior  ai)penda<^es. 

Up  to  the  present  lime  oidy  European  s)»ecies  have  lieen  made 
known;  I  am  now  enabled  to  add  to  them  a  North  Ami'ricaii 
species. 

The  name  of  the  genus  (from  i{>xoi,  wall,  fence,  and  nTojuo, 
mouth)  has  reference  to  the  oral  oiienintr,  surrounded,  fence-like, 
by  the  suctorial  surface  covered  with  rows  of  hairs  ;  this  being  the 
case  with  those  species  on  which  1  had  originally  established  this 
genus. 


■■j;t; 


■,i  ■.■'  ■' 


:-  "  ».  ■'&;    ' 


1.  II.  linicolor,  n.  sp.  %  . — Ol^scure  viridis,  nitirlns,  aiitennis,  ocu- 
lorum  ti'gnl.'irunKiiie  ciliis  in'ilil)us(nn'  totis  iiigris,  jilis  ciiiereis,  liinieliia 
liypopygii  ovatin,  nigricantilius,  in  ili.-'co  sordidissime  exalbidis. 

Dark-green,  bright;  antennrr,  cili.i  of  tlie  inftirior  orbit  and  of  tlie  ti'guhn, 
also  the  feet,  black  ;  wing;?  gray,  lanu'll;p  of  tho  liypopygiuin  oval, 
blackish,  upon  their  middle  very  dingy  whitish.  Long.  corp.  0.11 — 
0.12.     Long.  al.  0.13. 

Dark  metallic-green,  almost  black-green,  bright.  Front  me- 
tallic-green. Antenna'  black  ;  third  joint  oval,  at  the  tip  only  with 
a  blunt  point.     The  color  of  the  narrow  face  seems  to  have  lieeu 


• 


IC- 


-:1 


'•;( 


lis 


DIPTEUA  OF  N(»IITII  AMKIIK  A. 


'imii'. 


m 


[I'AiiT  ir. 


orijiiiiiilly  ffniy.  Cilia  of  thf  iiilVricir  orl>it,  as  far  as  I  ran  (lis- 
tiii^ui>li,  iiiack.  Sciitciliiiii  witlimit  iiairs.  II y|Mipy^'iuiii  i)lai-k  ; 
lis  laiiK'iia!  nitliiT  iaijif,  oval,  iiiirruwnl  at  llu'  runt,  IViii^'nl  wiili 
i»latk  hairs;  tlicy  have  a  lila(ki>li  a|t|M'araiii<',  aiT  liuwcvir  rially 
l)lai-k  only  on  tiic  niar<:'iii,  wliilr  in  tlit>  initMIc,  at  least  wlit'ii  son 
in  a  iMTtain  (iirt'ction,  tlicy  Itmk  dinji-y  wliilisli.  Coxa'  ami  I'lct 
Idark,  the  latter  plain;  I'eniura  \\itlia  jireenisli  rellectinii ;  tlie 
upper  side  (if  the  lore  tiliia-  only  with  two  small  Itrislles.  The 
yelliiwish-white  tejrula'  have  l»laek  cilia.  Wiiius  u-rayish  hyaline 
with  railier  delieate  hlaek  veins;  they  are  cdinparalively  lunji'  and 
narrow  and  have  a  very  re;iidar  elonjrated  elliptic  outline.  The 
last  sc^nnent  of  the  fourth  lon^i'itudinal  vein  is  especially  lon<r, 
with  an  iniperceptilde  sweep  and  approaches  in  its  entire  course 
jiradually  the  third  lonjritudinul  vein,  so  that  iheir  vmU  are  not 
very  distant  from  each  other. 

JJul).   Fort  llosulutiuu,  Hudson's  IJay  Territory.     (Kcnnicott.J 


f ' 


si 


,  i 

•I? 
:    I 

§; 
■  'I' 

•Si 


» 

■■      t 

ppi^ 

■       i4 

•^:ih 

i^ 

1         {•' 

.^h-y 

'K 

>,-:•,  f 

''<' 

Ittii;  ■■': 

■]) 

i|;';^> 

n     . 

(ien.  X.     IITI'OPIIYI.l.t  S. 

This  frenns  may  l»e  characterized  in  the  followin.u"  uniuner :  The 
lirst  jointof  the  anteinue  distinctly  hairy  on  its  upper  cdji'e,  the 
second  joint  of  the  antenna)  transverse,  the  third  not  elouiialed  ; 
the  arista  dorsal,  very  bare,  rather  strousj;  as  far  as  its  end ;  its 
lirst  joint  in  the  male  remarkahle  either  for  its  jireat  length  or  its 
incrassated  tij).  The  face  of  the  male  very  narrow,  especially 
Itelow  ;  the  face  of  the  female  broader,  sometimes  much  broader. 
Sculelluni  not  hairy.  Abdomen  elongatid,  that  of  the  nnilo 
rather  strikinuly  pointed  at  the  end.  The  entirely  disen,u'a<i'e(| 
liyjuipyiiMum  pedunculnted,  usually  of  a  yellow  color;  its  exterior 
appendajres  lie  (»n  its  under  side,  stretched  out  alongside  of  each 
other,  and  are  small,  narrow,  eloni>'ated  lamelhe;  the  interior  ap- 
pendau'es  are  rennirkablo  for  their  extraordinary  development,  are 
nnich  loufror  than  the  exterior  ones,  either  strap-shaped  or  broader 
at  the  end  and  beset  with  long  hairs.  Feet  comitaratively  lonj? 
and  slender;  the  lirst  joint  of  the  hind  tarsi  without  ))ristles  and 
shorter  than  the  second.  The  last  segment  of  the  fourth  longi- 
tudiiml  vein  has  only  a  very  gentle  sweep  and  very  gradually  aj)- 
proaches  the  third  longitudinal  vein. 

The  narrow,  stretehed-out  shape  of  the  body,  the  peculiar  struc- 
ture of  the  arista,  the  long  pedunculated  yellow  hypopygium  and 


II.\I,TKtll('KUrS. 


119 


tlio  pccjilinr  sfnirtnro  of  its  iippi'iKliif^cs,  (listiiijjiiisli  thus  genus 
sulViciciitly  rroiii  all  tlir  oilier  rrliitcil  p'ciici'ii. 

Only  Kiiropcaii  species  of  //i//)iipliifUu!<  iiro  as  yi't  known. 

'I'lie  niiiiie  of  the  jj:enns  (from  vno,  nnder,  iind  trxxov,  the  leaf) 
has  relereiiee  to  the  niodt.'  of  life  of  llie  speeies,  fonnd  in  shady 
places  uii  Ituslics  und  horljs  and  rnnning  on  IkiiIi  sides  uf  the  leaves. 


Oen.  XI.     II  il.TI.RK  F.lll  N. 

This  genus  was  estaldished  l)y  Mr.  Ilomlani,  in  tlie  year  1H44, 
in  the  \\\\  volnnie  ni'  the  AiukiU  ilillf  siirii:f  NdhiraJi  tli  /So- 
1(11/1111,  nnder  the  luune  of  Linlni-iriiix,  which  afterwards,  in  the 
first  vidnin(,'  of  the  /'riiilrotiiiit<  Jh/ilrroloijuv  lldlicir,  he  changed 
into  /Ifillrritiriix.  His  statements  with  regard  to  the  characters 
of  the  geiins  are  not  snilieient  ami  not  allonelher  correct.  1  am 
ulile  to  complete  and  t(»  correct  them  as  follows,  from  two  Span- 
ish species  of  my  own  collcctittn,  one  of  which,  accoriling  to  Mr. 
llaliday,  is  also  fonnd  in  Tpjier  Italy. 

The  face  of  the  nnde  very  narrow,  that,  of  the  fennile  compani- 
tively  very  liroad  ;  in  l)oth  sexes  it  does  not  (piile  reach  the  lower 
marii-in  of  the  eye.  J'alpi  snndl.  The  lirst  joint  of  the  antenmii 
of  the  nnde  large  and  very  inncli  inllaiecl,  in  the  female  mnch 
smaller  and  less  inllated,  in  Inith  se.xes  however  beset  on  the  npper 
side  oniy  with  extrenu-ly  slmrt,  rather  imperceptiltle  hairs.  The 
second  Joint  of  the  anteinne  in  both  sexes  very  snnill,  rathi  r  rndi- 
nienlal,  somewhat  imi)edde(l  into  the  lirst  joint  and  only  dislin- 
gnishalde  )»y  the  l)ristles  with  which  it  is  fringed  ut  its  end.  The 
third  joint  of  the  antenna-  in  the  females  of  all  species  appears  to 
he  ronnded ;  in  the  nmii'S  it  has.citlier  a  more  elongated  or  almost 
a  conical  form.  The  arista  of  the  I'emale  is  plain,  dorsal,  two- 
jointed,  its  lirst  joint  short.  The  arista  of  the  male  is  also  two- 
juintecl ;  its  lirst  joint  is  liliform  and  very  nnn-h  elongated,  the  ab- 
lireviate(l  second  joint  forms  a  Hat  lamella;  the  position  of  the 
arista  in  the  nudes  with  an  oval  third  joint  is  distinctly  snliapical, 
in  the  other  species  it  is  apical  or  appears  to  lie  so.  'I'iie  nenra- 
tion  of  tlie  wings  resembles  that  of  the  species  of  Si/flriiiiK,  the 
last  segment  of  the  fourth  longitudinal  vein  being  gently,  but  still 
sulliciently  inflected  forward  to  approach  with  its  end  closely  to 
that  of  the  third  longitudinal  vein.  Feet  slender,  with  sctirco 
bristles;  the  first  joint  of  the  hind  tarsi  without  bristles  and  much 


'  » 


Tfff^ 


120 


mpTERA  01'  NOHTir  amp:rica. 


[part  ir. 


shorter  than  tlic  second.  II\  i)opvn:ium  entirely  disengaged  and 
jK'ihinculated ;  its  exterior  appendages  are  hunelliibrni,  the  inte- 
rior (»n('s  nineh  less  developed  than  those  of  JI/jpopJiijllus. 

The  species  of  J/allericcrus  are  related  to  the  species  of  the 
genera  JIijpoplujUus  and  .I/i'rcotif<n)iiis ;  they  diller  from  them 
sulllciently  liy  the  rndimentary  second  joint  of  the  antenna'  and 
also  the  strncHirc  and  position  of  the  arista.  They  have  also 
some  resemltlance  to  the  si)ecies  of  the  genns  Hifslcnus,  the  first 
antennal  joint  of  which,  however,  has  no  hairs  on  the  upper  side 
and  the  arista  is  distinctly  apical  in  both  sexes. 

The  name  of  the  genus  (from  a^nji),  the  poiser,  and  x/paj  the 
horn)  has  reference  to  the  renuirkable  structure  of  the  arista  of 
the  male. 

As  yet,  only  the  three  above  named  species  of  JlaUcriceriis, 
which  belong  to  the  Fauna  of  Southern  Europe,  arc  known. 


Gen.  XII.     DIOSTRACL'S. 

The  North  American  species,  for  which  I  have  estal)lished  this 
genus,  resembles  Thinophilua.  In  the  structure  of  the  abdomen  it 
reminds  me  of  A/>hrof<i/li(f<.  with  which  it  also  agrees  in  the  struc- 
ture of  the  hypo])ygiuni.  Jt  dilVers  from  l)oth  of  these  genera  by 
the  distinct  hairs  on  the  u]»per  side  of  the  first  joint  of  the  antenna?. 

The  following  may  be  considered  as  the  characters  of  the  pre- 
sent genus :  Face  lu  both  sexes  broad  ;  the  palpi  in  the  male  of 
extraordinary  size,  in  the  fennde  much  smaller,  and  in  both  sexes 
loosely  recund)ent  upon  the  jjroboscis.  Antenuic  small ;  first  joint 
liairy  ;  second  joint  transverse  ;  third  joint  extremely  small,  dis- 
tinctly covered  with  hairs,  and  with  a  dorsal  bristle.  Thorax, 
scntellum  and  feet  only  with  short  and  very  scarce  bristles.  Ab- 
domen with  short  hairs,  without  any  longer  bristles  before  the  ii".- 
cisnri's.  First  jtnnt  of  the  hind  tarsi  witlnnit  bristles,  considera- 
bly htnger  than  the  second.  Wings  long  and  narrow  ;  the  poste- 
rior transverse  vein  somewhat  close  to  the  margin  of  the  wing; 
the  last  segment,  of  the  fourth  longitudinal  vein  without  any 
flexure,  but  only  a  little  curved,  converging  somewluit  towards 
the  third  longitudinal  vein  and  ending  beyond  the  tip  of  the  wing. 
The  fifth  segment  of  the  abdomen  of  the  nnde  is  rather  narrow ; 
the  sruall  si.xth  segment  partially  concealed  under  the  former ;  the 


i>iostract:s 


I'Jl 


liypopyjrium  short,  stout,  ratlier  diseiigiigi'd  ;  its  outer  apin'iiilajii'S 
are  suuiU  lanu'lla'. 

The  {reuus  J>iostraci(K  is  so  i)e('uliar  tliat  more  drtailiMl  statf- 
uu'iits  are  unnecessary  to  (listiujiMiisii  it  from  other  fi-enera.  Its 
UKtst  strilving  character  is  the  peculiar  (lisk-lilie  Inrni  of  the  ]>alpi 
and  their  very  consideral)Ie  eiilar,u'cnient  in  tlie  nudes. 

The  name  of  the  ficnus  (from  61.;,  twice,  63T|iaxor,  potsherd)  iuis 
reference  to  this  diaracter. 


1.  I>.  prasiims  LoKW.  %  and  9. — Prasinus,  subopacus,  abdoniiiio 
iiigiii'iinti',  in'ilihiis  llavis,  maris  tertio  tarsoruni  antiforiiui  artiuulo  coia- 
presso  ft  in  luarginu  supero  pilis  nigris  barbato. 

Leek-green,  sotncwbat  dnll,  with  a  blaekisli  abdomen  and  yellow  feet ; 
third  joint  of  the  fore  tarsi  of  tlie  male  compressed  and  bearde<l  on  the 
npper  margin  with  long  hairs.  Long.  corp.  0.1b — (.1,20.  Long.  al.  0.-;5 
—11.24. 

Syx.  Dloslraciis  jinisiiuis  Lokw,  Neue  Beitr.  VIII,  44,  1. 

Male.  Face  for  a  nui'e  very  Itroad,  metaliic-g'reen  or  Iiiiie- 
g-reen,  sometimes  coi»per-col(«red,  witli  a  ratlier  distim-t  tran-verse 
swelling,  and  hy  far  not  reaching  the  lower  margin  of  tlie  eyes; 
dusted  with  grayish-yelhtw.  Palpi  of  uniisiud  size,  rather  rounded, 
loosely  recuml)eul  upon  the  pntlxiscis.  yellow,  covered  on  the  upper 
side  witli  a  thick  snow-white  powder,  ami  with  a  delicate,  almost 
iuiperceptiltle,  white  pubescence.  J*rol)oscis  for  a  nude  unusually 
large  and  stout,  brown.  The  snndl  auleuna'  lirownish-yellow, 
most  of  the  third  Joint  linjwn,  the  dorsal  arista  blackish-l)rowii, 
lonii:  ami  not  verv  stronu-,  with  a  short,  I)Ut  distinct  indtesccnce. 
Front  above  broader,  metallic-green  or  blue-green,  seen  (tl>Ii(pu'ly, 
somewhat  darker,  without  dust.  Cilia  of  the  ui»i>er  orbit  black, 
of  the  lateral  ami  inferior  orbits  yelhtw.  I'ppersiile  of  the  thorax 
of  a  s-aturate  leek-green  or  parrot-green  odoring  ami  with  very 
little  lustre;  on  its  anterior  nuirgin  there  is  some  gray-whilisli 
liolleii,  which  is  interrupteil  l)y  the  anterior  end  of  a  not  very 
striking  and  not  far-reaching  dark-ctdored  middle  stripe.  The 
usmd  )»lack  bristles  011  tl;e  u|)p(  r  side  of  the  tiH)rax  are  few  and 
sl.'irt ;  there  are  m)  liair,*  ujiou  it.  If  exanuned  from  liehind,  a  sti'ipe- 
likedark  scarlet-brown  spot,  immediately  above  the  root  of  the  wing, 
may  be  noticed  ;  on  the  posterior  uiargin  of  the  Miora.x  tlie;'e  is  also 
a  more  distinct  covering  of  brown-grayish  dust.  Sciitellum  with  tin; 
usual  bristles,  olherwisu  bare,  >ioiuewl;ut  sho'-t,  usun.'ly  of  a  mure 


'•! 


h 


i^''' 


miff^jm 


:  i 


ililiil 


i;  (i 


lii^;^ 


;(i 


122 


DIl'TERA  OF  NORTH  AMERICA, 


[I'ART  ir. 


dusky  color  tlian  the  uppor  side  of  the  liionix.  IMotiriu  wilh  frrayisli 
dust  upon  black ish-jfreon  ground.  Tlie  nictatlionix  is  of  unusual 
Icnu'tli  and  slopes  but  very  gradually,  so  tliat  tiie  lenjitli  of  the 
thorax,  as  compared  with  that  of  the  abdomen,  is  unusually  lar^e. 
The  color  of  the  abdomen  is  dusky  bla('kisli-<rreen  and  but  litth; 
metallic  ;  the  hairs  are  short  and  oidy  on  the  posterior  nn>r<iin  of  the 
first  segment  there  are  some  black  liairs  of  greater  length.  Tl.e 
l)lack  hypopygium  is  short  and  stout,  sessile,  but  rather  disengaged  ; 
its  snndl  outer  ap]>endiiges  are  lamellii'orm,  ))lackish-bro\\n  and 
liairy.  Fore  coxiu  long,  pale  yellow  ;  on  the  Iroiit  side  they  are  Ix'set 
Avitli  so  short  and  delicate  white  little  luiirs  that  they  appear  gl.i- 
broiis  ;  at  their  tij)  there  are  black  bristles.  ^Middle  and  hind  coxie 
yellow,  often  brownish  as  far  as  the  tip,  es])ecially  on  the  outside. 
Feet  yellow,  rather  long  ;  middle  and  hind  fenioru  very  slender  ;  fore 
femora  considerably  stronger  ;  all  the  til'iie  <  ;.  i.ie  under  siile  very 
l)are,  otherwise  beset  with  (piite  short  little  black  hairs  ;  tore  tibite 
rather  stout,  somewhat  comitressed  and  curved  inwardly,  colored 
with  brownish-black  u])on  the  latter  half  of  the  upper  side  and  most 
of  the  hind  side  thickly  bearded  with  long  yellow  hairs.  I^Iiddle 
and  hind  til»ia;  plain,  beset  oidy  with  few  and  wea'c  bristles,  infus- 
cated  at  the  end  Fore  tarsi  black,  only  at  the  basis  of  the  first 
joint  )>rown  ;  the  urst  joint  oidy  a  little  longer  than  the  second; 
the  second  at  the  tip  with  a  vestige  of  a  slight  conijtression  ;  the 
third  joint  strongly  compressed,  broad,  bearded  on  the  ujiper  i'(\i<:(i 
with  stitV  black  bristle-like  hairs  ;  the  two  last  joints  very  short,  and 
of  the  usual  form.  ]Middle  tarsi  somewhat  longer  than  the  tiltiie, 
the  tirst  joint  alxnit  as  long  as  the  other  three  taken  <>igi.(lier,  yel- 
lowish-brown with  Idacktip  ;  the  last  four  joints  are  M  i  i  mid  the 
noddle  tai':;i  on  the  hind  side  rather  thickly  covered  >v,i'  long 
hairs,  liind  tarsi  black,  about  as  long  as  the  tii)ia',  of  plaiu  struc- 
ture and  not  unusuallv  hairv  ;  the  first  three  joints  are  of  araduallv 
diminishing  length,  the  fourth  about  half  as  long  as  the  third,  and 
the  fifth  again  somewhat  hdiger  than  the  fourth.  The  teguho 
have  brown  margins  with  yellowish  cilia,  which  assume,  in  some 
directions,  a  brown  tinge.  Wings  grayish  hyaline,  long  and  nar- 
row with  rather  strong  brownish-l)lack  veins  ;  the  first  longitudinal 
vein  reaches  far  beyond  the  third  ]»art  of  the  anterior  margin  ; 
second  longitudinal  vein  straight ;  the  third  longitudimd  vein  at 
its  end  only  very  geidly  curved  backwards;  the  posterior  trans- 
verse vein  lie.s  far  beyond  the  middle  of  the  wing. 


ANKPSIUS — AROYRA. 


123 


Female.  Face  liroadcr  than  tliat  of  the  male,  with  a  more 
devL'loiii'd  traiisvrrso  swell  in  <r,  and  covered  with  dust  of  iiiueh  more 
gray  color,  raljti  iiiiich  sinallor  liiaii  those  of  the  male,  only 
about  half  as  lariri',  l)hu'kish  with  yellow-fi'rayish  dust,  and  with  a 
consi(lenil)lo  covering  of  pale  brown  hair,  which  in  another  direc- 
tion ai>i>ears  to  be  entirely  black.  The  sixth  segment  of  the  al)- 
doinen,  although  very  short,  still  distinctly  perceptilile.  The  hairs 
on  the  anterior  side  of  the  fore  coxic  longer  and  coarser,  yellowish. 
Tibise  and  tarsi  simi)le  and  with  the  usual  short  hairs;  the  joints 
of  the  fore  tarsi  gradually  diminishing  in  length.  The  wings 
usually  a  little  duller  than  those  of  the  male. 

Hab,  2se\v  York.     (Osteu-Sacken.) 

Gen.  XIII.     AIVEPSIUS. 

The  genus  Ancpsius  shows  the  closest  relation  to  the  genus 
SiiKtcnux,  from  which  it  differs  oidy  l)y  the  structure  of  the  first 
joint  of  tlu!  antennae  Its  characters  are  the  following:  The  first 
joint  of  the  antennie  hairy  on  the  u|)])er  side,  the  second  transverse, 
the  third  rather  large  ;  the  arista  inserted  on  its  ui»])er  side,  (iiiito 
near  tlie  basis.  The  abdomen  of  the  male  appears  compressed 
from  the  side.  IFypopygium  short,  not  entirely  iiidjcdded  ;  its 
outer  appendages  very  snmll.  The  first  joint  of  the  hind  tarsi 
without  bristles.  Wings  not  enlarged  towards  their  basis;  the 
last  segment  of  the  fourth  longitudinal  vein  not  inflected  and 
jtarallel  to  the  third  vein. 

Tlie  name  of  the  genus  (from  djf^/to;,  cousin)  1ms  reference  to 
its  intimate  relationshij)  with  Hiji^tennx. 

No  si)ecies  of  Anept^ius  has  yet  been  found  besides  those  known 
from  Europe. 


1>^ 


Gen.  XIV.     ARUYRA. 

The  species  of  Argi/ni  are  easily  distinguished  by  the  dense 
silvery-white  dust,  which  almost  in  all  the  species  covers  head 
and  abdomen,  in  many  also  thorax  and  scutelluui.  The  majority 
of  the  sjtecies  of  the  genus  Jjcwoxtola  resenil)le  in  this  respect 
those  of  Ar(iyra,  and  differ  from  them  oidy  Ity  the  first  joint  of  the 
antenuic  of  the  former  being  entirely  l)are,  while  in  the  species  (jf 
Anij/ra  it  is  covered  with  hair  on  the  upjier  side.  The  following 
are  the  most  important  characters  of  the  genus  Ar^iyra  :  Second 


■mm 


W 


tl 


124 


Dll'TKRA  OF  NORTH  AMKHICA. 


[part  it. 


joint  of  the  antonnic  traiisvorso ;  tliird  in  tlic  male  rather  lar^'^o, 
baro  ;  the  apparently  liare  and  distinetly  twn-jointed  arista  is  in- 
sorted  elose  to  tlie  tip  of  the  antenna.  AVinji-s  l)r()ad,  the  posterior 
anj^le  ratlier  stron;.!;ly  projeetinji- ;  the  first  hmjjritndinal  vein  is 
ratlier  more  distant  from  tiie  nnirgin  of  the  winj^  than  in  most  of 
ihe  otiier  jj-enera,  and  is  longer  than  usual ;  the  fourth  longitudiiud 
vein  is  inlleeted  forward  before  the  middle  of  its  last  seirnu'iit, 
thence  however  it  is  (piite  parallel,  or  almost  parallel,  with  the 
third  longitudinal  vein  ;  the  posterior  transverse  vein  is  not  ap- 
pro.ximated  to  the  margin  of  the  wing.  The  lirst  joint  of  the 
hind  tarsi  without  bristles,  llypopygium  small,  imbedded  ;  its 
outer  appendages  are  two  very  small,  narrow  lamelhc  directed 
downwards ;  the  interior  appendages  are  of  rather  simple  struc- 
ture and  often  not  distinctly  ])crceptiljle. 

The  name  of  the  genus  (from  aijyvpo;,  silver)  has  reference  to 
the  beautiful  silvery  lustre  of  most  of  the  species. 

The  hitherto  known  species  are  distributed  over  Europe,  a  part 
of  Asia  and  North  America.  I  know  seven  North  American 
species,  of  which  the  first  has  a  hairy  scutellum  and  therefore 
))elongs  to  the  relationshii)  of  the  European  Anpjra  dinphana. 
The  other  six  species  have  jio  hairs  upon  the  scutellum ;  the  upj)er 
side  of  the  first  joint  of  the  antenmc  is,  in  some  of  them,  so 
scarcely  provided  with  hairs  that  they  can  easily  be  mistaken  for 
species  of  Leucostola. 


Table  for  the  determination  of  the  Species. 


,  f  Scutellum  hairy. 

I  Scutellum  not  hairy. 
2  (  Feet  mostly  hlack. 

I  Feet  entirely  or  mostly  yellow. 


1  albicans  Ln 


3 
4 


'The  entire  fore  tibite  and  a  part  of  the  four  posterior  tibire  yellow. 

2  nigripes,  uov.  sp. 
All  tlie  tibiiB  entirely  and  the  root  of  the  fore  tarsi  yellow. 

3  albiventria,  uov.  sp. 
,  I  The  whole  feet  yellow.  6 

l  Not  the  whole  feet  yellow.  6 

fThe  first  joint  of  the  hind  tarsi  only  with  the  usual  very  short  hairs. 

4  minuta  Lie. 
The  first  joint  of  the  hind  tarsi  with  longer  hairs  than  usual. 

5  calcitrans  Lw. 

n  )  Tip  of  the  hind  femora  not  black.  6  calceata  /.«•. 

I.  Tip  of  the  hind  femora  black.  7  cylindrica,  nov,  ?p. 


o  <, 


k 


m 


ARGYRA. 

Systematical  arrdiiijewcnt  of  the  Species. 
I.  Scutelluin  distiiK^tly  hairy. 

1.  albicans  /.lo. 

II.  Scutellum  without  haira. 

A.  Abflouien  somewhat  nonical,  white,  glittering. 

2.  nigripes,  nov.  sp.  5.  calcitrans  Lw. 

3.  albiveiitris,  nov.  sp. 

4.  minuta  /.w. 


125 


■:  ] 


0.  calceata  Lw. 


B.  Abdomtn  entirely  cylindrical,  without  white  glitter. 
7.  cylindrica,  nov.  sp. 

Descrijitioii  of  the  Species. 

I.    SrUTKLLUM    DISTINCTLY    HAIRY. 

1.  A.  albicans  Lokw.     %  and  5. — Scutello  piloso,  tibiarum  postica- 
rum  apice  tarsis(iue  posticis  nii;ris. 

Scutellum  hairy,  tip  of  the  hind  tibiae  and  the  hind  tarsi  black.     Long, 
corp.  0.2:5—0.24.     Long.  al.  0.23—0.24. 

Syn.  Arijyra  alhicmis  Lokw,  Neue  Beitr.  VIII,  45,  1. 

3foh'.  Covered  all  over  with  filitterinjr,  silveuy-wliito  dust.  Face 
and  front  of  niiddl:'  breadth,  silvery-white.  Palpi  black.  Pro- 
boscis brownish-black.  Anteiuue  black,  the  third  joint  more 
In'own-bh^'k  ;  arista  distinctly  inserted  before  its  end.  Cilia  of 
the  superior  orbit  Idack,  the  hair-like  cilia  of  the  lateral  and  infe- 
rior orbits  snow-white.  Fpj)er  side  of  the  thorax  and  scutolluni 
shiniuu:  <j:reen,  still  so  that  the  silvery-white  dust  seems  to  cover 
the  ground  color,  even  if  looked  u|»on  from  different  sides.  The 
soutellum  has  upon  its  upper  side,  besides  the  usual  bristles,  some 
very  distinct  little  black  hairs.  Ground  color  of  the  abd(Miu'u 
greenish-black,  the  second  and  third  scfrnients  have  very  larire, 
rounded,  transparent  yellow  lateral  sjjots;  otherwise,  the  whole 
abdomen  is  also  covered  with  thick  silvery-white  dust ;  its  hairs  are 
almost  exclusively  black.  The  small  and  narrow  lamelhe  of  the 
hypopygium  are  brownish-yellow  with  black  tip  and  with  a  black 
]>ubescence.  Fore- coxa'  yellowish  with  white  dust  and  with  black 
bristles  and  little  hairs.  Middle  and  himl  coxa*  black  with  white 
dust;  th'Mr  hairs  and  bristles  black.  Feet  yellow  with  bhack 
hairs ;  upon  the  under  side  of  the  fore  and  middle  femora  are  iu- 


m 


I    ',5 


it 
I'  . 


ililli 


126 


DIPTERA  OP  NORTH  AMERICA. 


[part  II. 


sertod  Mack  Imlrs  of  jrveatcr  lenjrth  than  those  on  tlie  unck'r  side 
of  the  liiiid  fi'inom,  wliich  are  brownish-bhu'k  at  the  tip.  Tiliite 
moderately  provided  witli  l)ristles,  tlie  hind  tibiie  blaekened  at  tlio 
tip.  F(tre  tarsi  towards  tlie  end  only  sliji-htly  infnseated  ;  tlie  (Irst 
joint  is  at  least  H  the  lenjfth  of  the  fonr  f()llo\vin«^  joints  toji-ether, 
npon  the  nnder  side  with  a  row  of  delieate,  l)nt  rather  lonjr  little 
hairs,  which  may  be  easily  overlooked.  Middle  tarsi  from  the 
i\\)  of  the  (irst  joint  blaekish-brown  ;  however,  the  root  of  tiie  ne.\t 
followinjr  joints  somewhat  ])aler ;  the  first  joint  is  at  least  by  one- 
third  lonji'cr,  than  the  ft)llowin,<;  fonr  joints  tojrether.  Hind  tarsi 
entirely  blaek,  first  and  second  joint  of  about  the  same  lenj^-tli, 
the  followiiif?  of  a  decreasiiijir  lensTth.  Cilia  of  the  tegula.',  which 
have  a  l)la('k  nKir<rin,  yellowish-white.  AVin<rs  somewhat  srrayish 
with  blackish-brown  veins;  the  last  seirment  of  the  fourth  lon<ritu- 
dinal  vein  is  strongly  bent  forward  l)efore  its  nuddle. 

Fcinalr.  Face  l)roader  than  that  of  the  male,  and  the  palpi 
miu'h  larsrer,  the  latter  with  a  distinct  covering  of  wliite  dust. 
The  third  joint  of  the  antenna',  as  usmd,  much  snuiller  than  that  of 
the  male.  The  dust  n]>on  tlie  thorax  and  the  scutellum  less  thick, 
so  that  the  <rrcen  trronnd -color  is  dislinclly  visible  in  everydircctiun. 
The  irround-color  of  the  abdomen  is  shiniiifr  and  metallic-ji'reeii, 
the  dust  upon  it  is  oonlined  to  the  anterior  half  of  the  segments, 
extending  only  upon  the  last  segment  as  far  as  the  ]»osterior  mar- 
gin ;  the  yellow  spots  of  the  second  segment  are  about  of  the  same 
size  and  nature  as  those  of  the  male,  those  of  the  third  segment 
oecui)y  only  the  anterior  corners  and  are  much  smaller.  The 
hairs  11)1011  the  under  side  of  all  the  femora  are  short  and  the  hind 
femora  are  very  slightly  infuscated  at  the  tip  only.  AH  the  rest 
as  in  the  male. 

Hah.   District  Columbia.     (Osten-Sackeii.) 

Ohsrrralion  1. — Notwithstanding  the  difference  in  the  coloring 
of  the  hind  femora,  the  female  agrees  with  the  above  described 
male  so  much,  that  T  cannot  have  the  least  doubt  of  its  ))eing  the 
other  sex  of  Arriyra  albicans. 

Olm'r ration  2. — Arrpira  alhirana  can  easily  lie  distinguished 
from  the  European  Arf/>/ra  dia/ihana  by  its  somewhat  smaller 
size,  the  paler  color  of  its  fore  eoxie  and  of  the  cilia  of  the  teguhe. 
Xevertheless  it  resembles  it  very  much.  As  Faliricius,  in  his 
S;/»fcma  Avtliaforum,  states  America  to  be  the  home  of  his  3/iisca 
diaphnna,  it  might  well  lie  supposed  that  he  meant  Argyra  alhi- 


'•V 


AUGYRA. 


127 


cniiH  or  some  similar  American  species,  and  that  Mcifren  was  mis- 
taken when  lie  believed  it  to  be  itleiitical  with  the  cdinmon  Kuropeaii 
species.  Such  a  supposition,  however,  would  be  erroneous. 
Fabricius  in  his  older  works  (of  which  at  present  I  cannot  com- 
pare <»nly  the  Manlisftn  II),  mentions  everywhere  Europe  as  the 
habitat.  The  statement  of  the  Si/xtrma  AntlintoriDit  is,  there- 
fore, either  a  mere  mistake,  or  Fiil>riciiix  confounded  later  an 
American  s]»ecies  with  the  European  one.  Even  in  the  hitter  case 
the  name  cannot  be  transferred  upon  the  American  species.  The 
first,  however,  seems  to  be  more  pi(il)al)le,  because  Faliricius 
in  the  S;/fti'vin  Antliatorum,  (piotes  his  former  works  without 
the  least  liesitation,  and  declares  that  America  is  the  habitat  ot 
this  species,  without  mentioniiifr  at  all  that  he  is  thus  in  contra^ 
diction  with  his  own  previous  statement. 


II.    SnTELMM    WITHOUT    HAIRS. 

A.  Abdomen  somewhat  conical,  glittering  with  white. 

3.  A.  nigrilM'S,  n.  sp.  %. — Kx  viridi  l.npte  chalybea,  abdomine  allx - 
micantc,  t'lonte  et  f.'U'ie  atris,  velutinis,  pedibus  iiigris,  tibiis  anticis 
totis,  reli(iuis  ex  parte  Havieantibu.s. 

Green-blue,  with  the  abdomen  glittering  white;  front  and  fane  velvct- 
blai/k  ;  feet  black,  the  fore  ti bine  entirely  and  the  four  posterior  tibia; 
partially  yellowish.     Long.  corp.  0.17 — 0.18.     Long.  al.  0.17. 

Green-blue.  Front  and  face  velvet-l)lack,  without  pale  dust. 
Palpi  and  proboscis  black.  The  first  j<dnt  of  the  aiiteniiie  witii 
a  comparatively  lonjr  and  close  pubescence.  I'pper  side  of  the 
thorax  and  of  the  scutellum  shiniii,u-;  the  latter,  as  far  as  percepti- 
ble, wit'  out  hair.  Abdomen  without  transparent  yellow  spots 
upon  the  anterior  sepnents,  and  with  a  thick  <i-littcriiin:-white  dust, 
which  becomes  thinner  only  towanls  the  basis  of  the  abdomen. 
The  small  laniellai  of  the  hy[)opy,<rium  are  brownish-black.  Coxa' 
black;  fore  coxse  with  coarse  black  hairs.  Femora  lirownish- 
black,  the  extreme  tip  of  the  four  anterior  ones  yellow  ;  they  have 
only  short  hairs  and  short  bristles.  Fore  tibia'  yellow,  on  the 
upjier  side  with  less  numerous,  but  stroiiirer  hair-like  I)ristles,  on 
the  hind  side  with  more  numerous  but  more  slender  hair-like  liris- 
tles  of  eonsid(!rable  len<]^1h.  Middle  tiliia'  ii])on  the  whole  upper 
side  yellowish,  upon  the  under  side  blackish-brown  ;  they  have 
upon  the  under  side,  upon  the  middle  of  the  anterior  side   and 


M         ■    I 


M 


mw 


tSM 


128 


lill'Ti;i(A  (IF  NullTH  AMi;illCA. 


[i'AUT  II. 


upnii  llio  first  lialf  of  tlic  uiipcr  sido  rather  stnjiifr  1)ristl('H.  IliiiA 
til)iiu  at  tlio  root  and  almost  upon  tlio  wliolo  sccoml  half  black, 
otherwise  l)rownish-yello\v  and  not  inerassated.  Fore  tarsi  yellow, 
soniewliut  inl'nscuted  towards  their  end,  of  jjlain  strneture,  only 
the  lirst  joint  upon  the  under  side  jjrovided  with  a  few  bristles. 
Middle  tarsi  brownish-yellow  at  the  basis,  further  brownish-black  ; 
the  lii'st  joint  has  upon  the  lirst  half  of  Its  underside  rather  numer- 
ous black  bristles.  ]lind  tarsi  black,  ])lain.  Cilia  of  the  teguhu 
l)lack.      Winti's  hyaline,  only  a  little  tinj:;ed  with  jii'ay. 

Jldh.   8itka.      (Sahll)er<i\) 

Ohxerratioii. — Of  this  and  of  the  next  followiiifr  s|)ecies,  as  also 
of  Anji/ra  ci/linilrioi,  I  jjossess  only  sin<ile  specimens,  danni<?ed 
by  mould,  which  crumbled  to  jdeees  in  the  attempt  of  cleaninjj,' ; 
however,  as  these  three  interestinj^  species  come  from  a  country 
which  is  so  little  explored  witii  regard  to  Dipterolotry,  and  as  the 
important  specific  characters  could  b(!  determined,  1  did  not  hesi- 
tate to  describe  them.  1  must,  however,  reipiest  not  to  attach 
more  weight  to  my  statements  about  color,  dill'usictn  of  the  white 
toinentum  upon  ul)domen  and  thorax,  and  about  the  appendages 
of  the  hypopygium,  than  the  circumstances  should  warrant. 

3.  A.  albiventris,  n.  sp.  %. — Viridis,  niteiis,  nlKlominc  alliomi- 
caiitu,  tVontc  ut  facie  iiiuris,  albiilo-polliiiosis,  pi'ilitius  nigiis,  tihiis  oni- 
iiibus  tiitis  tarsoruii»4Ue  aiitii-orum  basi  lhivicantil)ii.s. 

(Jioen,  .^hilling,  abdomen  wliite,  glittoring:  front  and  face  blackish,  bat 
with  whiti.sh  dust;  the  whoh)  tibiae  and  tlie  root  of  tlie  fore  tarsi  yel- 
lowisli.     Long.  Corp.  O.IS — O.llt.     Long.  al.  O.JS. 

Metallic-green.  Front  and  face  ajtjiear.  when  looked  upon  in 
most  directions,  almost  whitish-gray  on  account  of  the  dust  which 
covers  them,  but  are  l)lack.  l'a]))i  and  proboscis  black.  An- 
tenna; smaller  than  those  of  A?'(/ijra  vigrrpei^;  the  first  joint  is 
comparatively  short  and  sparsely  beset  on  the  u])per  side  with 
ratlnn-  short  hairs.  Thorax  and  scutellum  shining  metallic-green  ; 
but  when  looked  upon  from  the  front,  the  covering  of  white  dust 
l)eeomes  distinctly  visible.  Scutellum  without  hairs.  Abdomen 
covered  with  a  thick  dust  having  a  white  lustre  ;  its  second  and  third 
segments  have,  on  the  lateral  margin,  a  large  yellow  transjiarent 
si)ot.  A'enter  mostly  yellowish.  The  small  lamelhi,'  of  the  hypo- 
jiygium  are  brownish-black.     Coxa3  black  ;  fore  coxaj  with  long 


m0- 

|a|C*'V 

1 

w¥' 

W!k 

'wh''*'''f' 

i-^^ti  '■■  '■ 

ff^'-'" 

,■{ 

■hL-i'' 

„  „{ 

ARdYRA. 


12H 


liliU'k  hairs.  Ffmora  brownisli-lduck  with  yoMuw  tip  ;  their  lihick 
hairs  arc  ('((innarutivoly  Utu^i,  especially  upon  the  under  side  (if  the 
I'uur  anterior  feinora.  Til>iu.'  yellow,  only  the  extreme  tip  of  llie 
hind  tibia!  hiaekish-hrown  ;  the  lore  tiltia'  «r(!  heset  with  four  or 
live  bristles  oidy  ujioii  the  upper  side  ;  the  snnill  l)ristles  upon  the 
middle  and  hind  tihiiu  are  likewise  lait  short  and  very  scarce  ;  the 
hind  tibial  are  not  in  the  least  thickened.  The  four  anterior  tarsi 
are  brownish-yelh»w  at  theliasis,  a  little  further  l)lackisli-l»rown,  of 
]ilaiii  structure,  the  first  joint  upon  the  underside  witlnuit  l»ristles. 
Jlind  tarsi  entindy  lilack.  Teguhe  mostly  l)lack  with  black  cilia. 
"Winjis  hyaline,  a  little  more  distiuetly  tinged  with  gray  than  in 
^1.  Hitfrijicx. 

llab.   Sitka.     (Sahlberj,'.) 


KM 


'\>W 


4.  A.  niinilta  Lof.w.  %  . — Scntdlo  mulo,  ppdit>iis  totis  palliMf  tlavi- 
ciiiitil)us,  niutatarso  iniiria  posticn  siiiiplii;!,  lnvvirtsiine  jmIoso. 

Scuteliiinj  l)iir«;  tlie  wliole  feet  jiale-yellowisli ;  tlie  lirst  joint  of  tlie  liiiid 
tarsi  of  the  male  .simple,  with  very  short  hair.  Long.  corp.  tMG.  Long. 
al.  0. 14—0. 15. 

Syn'.   Arijyra  iiiiiintd  LoEW,  Neue  Beitr.  VlII,  4ii,  2. 

Mdlc.  Faee  very  narrow,  silvery-white.  I'alpi  Idaek.  Tro- 
boseis  brownish-black.  Anteiinte  black,  third  Joint  more  l)lackish- 
brown  ;  arista  distinctly  inserted  )>efore  its  tip.  Fnuit  silvery- 
white.  Cilia  (  n  the  upper  orbit  black,  very  short  and  delicate  ; 
cilia  of  the  Ir.teral  and  inferior  orbits  white,  'riiora.x  and  scutel- 
luni  shininp:  green,  covered  with  white,  not  very  thick  dust,  which 
conceals  the  ground  color  at  the  utmost  oidy  in  the  vicinity  of  the 
shoulders.  Scufellum,  with  the  exception  of  the  usual  liristles, 
bare.  The  giuiuiu  coioi  of  the  abdomen  apj)ears  to  be  blackish- 
green,  is  however  so  thick. y  covered  with  white  dust  that  it  can- 
not be  distinctly  perceived  ;  the  second  segment  of  the  alxlomen 
has  on  each  side  a  very  large  rounded  yellow  lateral  spot ;  the 
third  segment  has  a  similar  spot,  lait  smaller.  The  very  small 
and  narrow  lamella.'  of  the  hypoiiygium  are  yellowish-brown  atal 
but  little  hairy.  Fore  coxse  yellowish-white,  with  white  hairs 
and  black  bristles.  Middle  and  hind  coxa?  also  yellowish-white, 
but  blackened  from  the  basis  to  a  considoral)le  extent  ;  hairs  and 
bristles  black  ;  feet  ]»ale-yellowish,  oidy  the  end  of  the  hind  femora 
has  a  vestige  of  infuscation  on  its  ujjper  side.  The  hairs  upon 
9 


I  ■    I 


TWfwr 


130 


DIPTKUA  OF  NdllTH  AMERICA. 


[I'AUT  II. 


the  feet  arc  not  entirely  bluek  ;  the  fore  femora  linve  nj)on  the 
hind  side  more,  the  iiind  feniora  »tii  the  nmh-r  side  less  nnmeroiis 
blnckish  hairs  of  jrreater  leiifrth.  Fore  tnrsi  not  infusealed  ;  the 
first  joint  has  searcely  l\  the  lenj^th  of  the  fonr  lollowinj^  joints 
put  tofrcther.  Oidy  the  last  joint  of  the  middle  tarsi  is  somewhat 
infusealed.  'i'he  lirst  joint  is  fully  as  long  as  the  others  together. 
The  last  joint  of  the  hind  tarsi  is  lirown  ;  the  lirst  joint  is  of  sini- 
jtle  structure  and  beset  with  the  usual  short  hairs,  searcely  a  little 
longer  than  the  second,  hut  eiuisidcraldy  thicker.  Cilia  <»f  the 
teguhe  yellowish-wldte.  Wings  hyaline,  scarcely  a  little  tinged 
with  yell(j\vish-gray,  with  brownish-yellow  veins;  the  last  segment 
of  the  fourth  vein  is  very  abruptly  bent  forward  before  its  middle, 
Hub.  District  Columbia.     (Osten-Saeken.) 


*  ■%"  ' 


ft.  A.  calcitrail8  Lorw.  %. — Scr.iello  nuilo,  p«ililins  totis  pallide 
llavicnntihuH,  inistatarso  jxistico  iiwiris  paulo  incra.ssiito  et  valde  liirto. 

Scutellura  bare;  the  whole  feet  pale-yellowisli ;  the  first  joint  of  the  hiinl 
tar.si  of  the  male  foinewhat  lIiickKiied  and  covered  with  rough  hair. 
Long.  Corp.  0.14 — 0.15.     Long.  al.  0.11. 

SvN.  Arijyra  cdleitruns  Loew,  Neue  Beitr.  VIII,  46,  3. 

Male.  Face  narrow,  silvery-wlute.  Thorax  and  proboscis 
black.  Anteiimu  black,  third  joint  nnire  blackish-brown  ;  arista 
distinctly  inserted  before  its  end.  Front  silvery-white.  Cilia  df 
the  upper  orbit  black,  very  short  and  delicate  ;  cilia  of  the  inferior 
and  lateral  orbits  white.  Thorax  shining  green,  covered  with 
thick  white  dust,  so  as  to  make  the  ground  color  invisible  in  some 
directions.  Scutellum  also  shining  green,  or  blue-green,  with 
less  dust,  and  bare  with  the  exception  of  the  usual  l)ristles.  The 
ground  color  of  the  abdomen  seems  to  be  blackish-bhic,  but  cannot 
be  distinctly  seen  on  account  of  the  thick  white  dust  which  covers 
it;  the  second  segment  is  yellowi.sh  and  transparent,  with  a  lilack- 
ish  border  on  the  posterior  margin  and  with  a  blackish  middle 
line,  which  is  sometimes  wanting;  the  third  segment  is  of  a  simi- 
lar color,  only  the  margin  on  the  ))ostcrior  border  and  the  middle 
line  are  broader,  though  the  latter  is  sometimes  interrupted.  The 
small  lamella)  of  the  Itypopygium  are  brown.  Coxte  and  feet 
white-yellowish ;  fore  coxa)  with  delicate  white  little  hairs  and 
delicate  black  bristles  ;  middle  coxa'  ou  the  outside  with  a  black- 
ish spot ;  liind  coxie  scarcely  a  little  blackened  on  the  extreme 


.1 
i 


.1   i(= 


AlKiVRA. 


l.]l 


liasis.  Foro  nn«l  middle  fcinora  witlioiit  nny  lotijrcr  hairs  oti  tlio 
under  side  ;  the  hind  feiiKira  have  a  row  of  hhick  hristle-lil\e  hairs, 
inserted  rather  more  on  their  hind  side  tliaii  ii|Min  the  under  side. 
Tarsi  towards  tlieir  end  not  infuscaled,  hut  onlv  very  litth'  darlser; 
the  lirst  Joint,  »»r  the  tore  tarsi  is  1.',  the  lenjrlh  (if  all  tlie  t'ojiouini^ 
joints  tal\en  to;rether,  <»n  th(^  uiaN'r  side  with  a  row  of  delicate 
]iairs;  the  first  joint  of  the  middle  tarsi  not  (|uite  as  lonu-  as  all  the 
otiicr  joints  t(»jretlier  ;  hind  tarsi  unusually  short,  the  first  joint  not 
much  shorter  than  all  the  others,  a  little  thickened,  on  the  under 
side  with  rather  loii<r  hristle-like  iniirs  ;  tlieseeond  and  third  joints 
(tf  the  hiinl  tarsi  of  alxpiit  e<|Ual  len<rth.  The  eilia  of  the  tetmhe, 
wldeh  have  a  hiackish  nnir<rin,  are  white-yellowish.  A\'in>rs  some- 
what tin^retl  with  yellowish-frray,  with  yelhtwish-hrown  v<'ins  ;  the 
hist  sejrmont  of  tlie  fourth  lonjritudinal  vein  is  l)Ut  jrently  inllceted 
forward. 

Hah.   New  York.     (Osten-Saeken.) 

6.  A.  calceata    I-oew.      9.— Sfutello  nu<lo,    jwililMis  pallido    llavis, 
tarsis  pusticis  iiigris. 

Si'iitelluiu  tjiire,  feet  jialc-yellow,  witli  Mack  liind  tarsi,     Long.  coip.  0. !(!. 

Long.  al.  O.lf). 
Sy.v.  Anji/rd  calredtn  LoEW,  Neue  H«Mtr.  VIII,  47,  4. 

Fonalc.  Faee,  for  a  female,  of  moderate  I»readth,  silverv- 
wliito.  Palpi  rather  larjre,  ))laek,  with  almost  silvery-white  dust  ; 
j)roboscis  hniwnish-hlaek.  Antenme  l)lack  ;  third  joint  small, 
with  an  acute  an<ruhir  tip;  arista  distinctly  inserted  In  Ion'  its 
end.  Cilia  on  the  i^iper  orhit  black,  extremely  short  and  delicate. 
Cilia  of  the  lateral  and  inferior  orl)its  white,  'i'iiorux  shinintr 
jrrcen,  in  the  vicinity  of  the  shoulders  rather  thickly  cov<'rcd  with 
white  dust,  s5  as  to  induce  the  liclief  that  the  males  are  idto<rethor 
covered  with  silvery-white  dust.  Scutelhim  also  sliininu'  ;!-reeii 
and  with  the  excejttion  of  the  usual  bristles,  bare,  (irnimd  color 
of  the  abdomen  jrreenish-bhu.'k  ;  the  second,  third  and  fourth  set;'- 
ments  yellow,  with  the  exce))tion  of  ilie  extreme  anterior  niarLnn, 
the  ])Osterior  nmrjrin  and  a  narrow,  not  always  distinct  miildh; 
line;  on  the  sides  of  the  sejrments  and  towards  the  tip  of  the  ab- 
domen there  is  some  white  dust.  Cox.e  and  feet  ]»ale-ye||(nvisli  ; 
fore  coxiB  with  delicate  whitish  hair  and  with  black  bristles  ;  mid- 
dle coxie  with  a  g'ray  spot  on  the  outside ;  hind  femora  scarcely  a 
little  darker  at  the  tip,  hind  tibiie  at  the  tip  not  of  u  dark  color. 


I.  .,  j 


"^f^ 


mm 


i:]2 


DtPTKIl.A  OP  NuIlTII  AMKKICA. 


[I'AIIT  It. 


Tarsi  ('oin|inriiliv('Iy  loiiff ;  fi»ro  tnrsi  Hcnrccly  iiifiiscntoil  townnls 
tlic  cihI,  only  tilt'  Inst  jniiif  hrnwn,  tlic  first  jniiil  ii  littlf  Innji-cr 
tliiiii  tlio  others  tukeii  tojrt'lli<'r.  Miildlc  liirsi  IVoiii  the  tip  nf  tin- 
first  joint  Htroiif^ly  iiit'iiscntcd  ;  the  four  Inst  joints  (ojrcdicr  iis  loiijr 
lis  tlic  first  one.  Hind  tnrsi  entirely  liliick,  tlie  first  joint  a  little 
shorter  than  the  second,  the  f'olhnvinir  joints  decreiisinjr  in  length. 
'I'lie  cilia  of  the  tejriihe,  which  have  a  hiackish  border,  are  pale. 
Wiiifjrs  tiiijred  more  with  hrownish  than  ycll(»wish-^'ray  ;  veins 
rather  dark  hrown  ;  the  last  sejrineiit  of  the  fourth  loiifjitudinal 
vein,  liefore  its  middle,  only  slightly  inflected  forwaril. 

Jiah.    Middle  States.      (Osten-Sackeii.) 

Ohftcrration. — It  is  impossihle  to  mistake  .1.  caUvnta  for  the 
female  of  one  of  the  two  preceding  species  for  the  following  rea- 
sons : — 

1.  On  aceoniit  of  the  greater  extent  of  yellow  color  upon  the 
abdonien,  which  is  not  so  extensive  in  the  females  of  the  sju'cies 
«»f  J/v/y/v/  as  ill  the  males. 

'1.  On  account  of  the  black  eolorin'  the  whole  hind  tarsi. 
It  is  probable  that  the  <;oloring  of  the  i  en  of  the  male  of  this 

species  resembles  that  of  the  mule  of  Leucustola  r{n(fi(l(ita. 


i 


B.  Abdomen  entirely  eylin<lrical,  without  wlute  lustre. 

1.  A,  C'}  lilldl'ica,  n.  sp.  %. — Viriilin,  niten:*,  aluloniine  vix  obao- 
letissiiiie  albiiio  poUiiiorto,  coxia  anticirt  peilibuscjue  flavis,  fetnoiuin  pos- 
ticoinm  api(;e,  suinnio  tibi.iium  posticarum  apice,  tarsis  deniijue  omni- 
bu:4  imlu  ab  artiuuli  prinii  apice  nigris. 

Shining-Ri-een,  the  alxlonien  has  scarcely  a  trace  of  whitish  dnst ;  fore 
i'ox<'B  and  feet  yellow  ;  tip  of  the  hind  femora,  tip  of  th<;  hinil  tibia?  and 
all  tarsi,  with  the  exception  of  their  root,  black.  Long.  corp.  0.2H. 
Long.  al.  0.22. 

Metallic-green,  and  difTeriug  from  most  of  the  species  of  Jr- 
cfi/ra  by  the  cylindrical  form  of  the  abdomen  and  the  almo;-t 
entire  absence  of  all  dust.  P'ace  with  a  white  reflection.  I'alpi 
and  proboscis  lirownish-black  ;  the  hair-like  cilia  of  tlie  inferior 
orbit  pale-yellowish.  Thorax  and  scutellum  shining,  the  latter 
without  hairs.  Abdomen  entirely  cylindrical,  not  stouter  about 
the  basis,  metallie-green,  without  any  transparent  spots  upon 
the  anterior  segments  and  covered  vith  a  thin,  almost  impercep- 
til)l(>,  grayish-white  dust.  Fore  coxa?  yellowish,  with  some  very 
scattered  black  hairs,  and,  at  the  tip,  with  lunger  black  bristles. 


■V,  I 

■    \ 


eVNToUMON. 


l: 


Mi)lill«'  1111(1  hind  ni\u>  liliickish-ltriiwii  witli  y(>]lowi>li  lip.  Feel 
yrlldwish,  tip  iil'tlit'  liiml  rciiniiji  iiniwnisli-ltliu'lv  to  a  coiisiiirnilM! 
extent.  Til*'  l>liiek  liiiir>  mi  ilic  t'cet  nrc  .<niiie\vliiit  ,'«piirsc  iiml 
iiiily  orniidtllf  ieii^rtii;  on  ilic  iiiiiler  .'^ide  ol'  the  iore  t'ciiiniii  ihtic 
lire  init  ti  I'vw  hhiek  iuiirs  uC  frrenter  h'li^'lli;  iipuii  llie  under  sid'! 
(if  the  middle  reiimni  tliey  iire  in  ^'renter  iiiiiiilM'r  ;  on  the  under 
side  of  tlie  liind  reinoin  only  tlio.se  hiiirs  which  lire  near  the  tip 
have  a  somewhat  jrreuter  leii^rth.  Fore  lihiie  with  somewlnit, 
loiifjer  hairs  on  the  under  side,  on  the  upper  side  with  hut  two  or 
three  hristle-like  hairs  of  greater  IciilmIi.  The  middle  and  hind 
liliiie  with  lint  few  and  very  short  little  liristles;  the  extreme  tip 
of  the  latter  is  infuseated.  (Fore  tarsi  wantiiiji.)  -Middle  tarsi 
plain,  black  from  the  tip  of  the  lirst  j(diit  ;  the  first  j(»int  .somewhat 
lonjrer  than  the  four  followiiijj:  to^n-ther;  on  the  underside  with 
liut  two  very  .^^hort  lilack  little  bristles;  hind  tarsi  black;  the  lirst, 
Joint  »p  to  the  middle  brownish-yellow.  Teniihe  with  a  broad 
black  marjrin,  with  pale-yellowish  cilia.  Winjrs  hyaline,  some- 
what tillered  witli  brown,  the  until  an^rle  less  protruding  than  in 
inoHt  of  the  other  species;  the  iieuration  shows  nothing  unusual 
for  the  <renus. 

J/nh.   Sitka.      (Sahlberg.) 

Ohnfrvalion. — Allhoiifih  the  imperfect  state  of  the  above  de- 
serilied  specimen  did  not  allord  a  thorough  examination  of  the 
hairs  upon  the  upper  side  of  the  lirst  joint  of  the  untennie,  still  I 
believe  to  have  salislied  myself  of  their  existence. 

Gen.  XV.     SV^'TORmOIV. 


:^)'i 


i" 


I 


>   .it 


Wiy-  " 


The  generic  character  is  as  follows  :  First  joint  of  the  antenniiB 
with  hairs  on  the  upper  side;  the  sccmjikI  reaching  on  the  inner 
side  of  the  third  in  the  shape  of  a  tliumli;  third  joint  of  the  an- 
tenna^ elongated  and  jKiinted  in  the  male  and  shorter  in  the  fe- 
male;  the  position  of  the  arista  apical.  Scutellum  bare.  The 
first  joint  of  the  hind  tarsi  without  bristles  and  a  little  shorter 
than  the  second.  The  hypoiiygium  small  and  imbedded,  with 
very  small,  often  not  distinctly  perceptible  appendages. 

The  next  related  genus  is  Si/naiilirKu,  the  .species  of  which 
differ  from  the  species  of  Si/nlortiion  only  by  the  absence  of  hair 
upon  the  first  joint  of  the  anteniue.  Although  this  character  may 
appear  trifling  to  those  who  have  not  studied  the  family  of  the 


'■%y\ 


1   !• 


'  .1  -n 


i;i 


DII'TKlt.V  OK  NdltTII   .\:\1I  Kir.V. 


rmmm 


{■■ 


ai:t  ir. 


Ihiliitinptuliiln  ciircriilly,  iicvciMIh'Icss  its  <il)st'rvutiiiii  is  iiii|Mirliiiit, 


lis 


il   is  of  vci'v  grciil  service  lur  llie  speeilie  <listiiietioii   as  well 


lis 


litr  liie  jieiierie  Idculiim  of  siieli  leiimles  of  ililVereiil  species  whit  li 
reseiiiltle  euch  other  very  chisely. 

'iMie  iiiiliic  of  the  fjeiiiis  (from  nm roi'Mow,  I  connect  hy  iiiserl<Ml 
pins)  hiis  reference  to  the  chiiriu'leristic  forinulion  of  the  second 
joint  of  the  iinleniiie. 

As    yet    only     Kiiro|tean    species    of   Si/nlitriimii    have    iKcoine 


knowii. 


XVI.     Sl\iKTIIItlN. 


Tlu'  followinir  are  the  most  important  characlors  (»f  this  jrentis  : 
The  iirst  Joint  of  tlie  antenna'  without  liairs;  the  secoiid  reachiiifjc 
more  or  less  on  the  inner  side  of  the  tiiird,  nsnally  forminuf  in  the 
mah's  a  tiiuml>-like  projection,  and  in  the  femiiles  a  more  iminth'd 
jnlte  ;  tiie  third  joint  of  tln^  aiitenme  in  the  males  elon<:-ated  and 
poinle(l  ;  aristii  apical  or  so  near  the  extreme  tip  of  the  aiitennie, 
as  to  be  taken  for  such.  Scutellum  usually  liare,  first  joint  of  the 
hind  tarsi  witliout  lu-istles.  'I"he  hy|»opyijiuiii  small,  imiteddeil, 
with  very  small,  often  not  distinctly  perceptihie  appendaiies. 

TluM   Si/ii(iiiliriifi  tlilVers  from   Si/nlnrinoii   onlv  hv  the  al»s( 


lice 


of  h"iv  upon  liie  Iirst  joint  of  the  antenme,  has  already  lieeii  stated. 

Of  the  three  species  (h'scrilted  helow,  two  undoulitedly  lielon"" 
to  the  n-eiius  Si/iKirtlirus.  This  cannot  lie  said  with  i'e<i-ard  to 
the  third  species,  SniKirt/inia  Ixirhdliia.  Its  position  in  the  ^■eiiiis 
Si/iiar/hnix  can  only  lie  a  temporary  one,  lirouirht  alHuit  liv  the 
(lilViculties  of  placing-  it  into  aimther  fi'enus.  It  is  stdliciently  (lis- 
tiiiuuished  from  the  other  species  of  Sifndr/finix  liy  the  pecniiaritv 
alone,  that  the  second  joint  of  the  anteinne  encroaches  only  verv 
little  on  the  inner  side  of  the  third.  In  its  u'cncral  appearance  it 
ap|iroaclies  the  species  of  I'of/ihj/nt/is  very  closely,  so  that  I  leavt; 
it  undecided  whether  it  would  not  be  better  located  there.  Tlu^ 
size  of  the  ])ulvilli  of  the  fore  tarsi  betrays  a  r«'latioiiship  with 
Kiitiirsiix  and  IHaiihonix,  the  structure  of  the  antenna',  however, 
does  not  allow  its  location  in  these  two  fi-enera.  To  erect  a  new 
lit'iiiis  does  not  seem  advisable,  as  the  species  shows  close  rela- 
tionship in  various  directions. 

The  name  Si/ixirlhnix  (from  nvv,  toircther,  niid  oii^imi-,  joint) 
has  reference  to  the  jieculiar  mode  of  connection  betwoeu  the 
second  and  tlie  third  joints  of  the  untonua.'. 


1^ 


SY.N.SKI'lllirS. 


ir 


'I'lic  spccii's  ulrcudy  kiinvvii    lji'l<iii;r  to  ]<Jiii-<)|><;  and  lu   North 
A  incrini. 

Tiilili  fur  tlic  ilftninlndtiDii  of  thi-  S/>icnn. 

.  (  I'ostorior  i)i;iii;in  (if  Mn^  pIciirM' yi'llow.  1  palmariB,  iiov.  sp. 

'  I'dstfi'ior  iii;ii>;iii  of  lh«  |il('ur;u  not  vcllow.  2 

,,  I  Hi  11(1  f((m()i;i  yellow.  2  ciiiereiveiitriB  /."■. 

•■  Hind  HMiiora  gnM-ii.  ;{  barbatua  /.»•. 


\i'  ; 

f 

.       .■    :■[» 


S)/slrniiit!riil  iintiuijrvirni  nf  llie  S/nrir-i. 

I.    Lower  lialf  (>r  tli(^  (icciput  only  with  tlic  iisiim!  cilia. 

1.  palmaris,  nov.  s]i.  2.  cinereiventris  Au'. 

II.   Lower  half  of  l\w  occiimt  with  a  strong  Iteanl. 
3.  barbatus  Ai». 

I}<srri/iliiiti  of  the  rSju'rlfx. 
I.     lidWKIl  ll.M.K  (IK  TIIK,  (MMII'ir  (>.  I,V   W  ITU  TIIK,  ISIAI,  I'lMA. 

1.  N.  pallliariH,  n.  sp.      %  and   9.— Viridis,  pUiuranun  inar>;ine  pos- 

tico,  coxis,  pe(liliiis(|iie  llavis. 
^.  Tarsis  inttMiiiediis  apieeiii  vursns  dilatatis. 
9 .  'I'arsis  sinipliciliiis. 

(ireeii,  tli(i  iMisterior  margin  of  IIk*  pleura',  coxa-  and  feet  yellow. 
■J,.  TIk^  middle  tarsi  towards  tluMreiid  eiilari;e(l. 
9.  Tarsi  simple.     Long.  curp.  (M:{.      Long.  al.  (1.14. 

Male.  It  can  !)('  cnsily  rccooiiizcd  l»y  its  strikiiif;  rcscniltliiiici! 
to  tlic  iMiidpcaii  Si/iiloriimii  /(irsaliis  Fnll.  Ilutli  r  diiik  Itroiizc- 
grccii,  little  sliiiiiiij;  ;  tlic  uImIoiiicii  nsiiiilly  rather  co|»|)cr-c()]()nM|. 
Aiitcmia' hlack  ;  I'.rst  j(»iiit  on  the  upper  side  entirely  hare  ;  the 
Hocond  with  a  lonir  tlminh-like  pi'dji'etidii  which  overlaps  the  inner 
side  of  the  third  ;  tliini  joint  rather  loiifr,  pointed,  very  l>iil»c>- 
eeiit, ;  the  arista  has  not  |treciscly  an  apical  init  a  somewhat  siilt- 
n|»ical  ))osition,  as  it  is  the  case  with  Si/n/orniDii  /(irsahis.  Face 
covered  with  whitish  dust,  narrow.  I'alpi  and  proboscis  hiack. 
Front  steel-ldne.  The  delicate  cilia  on  the  inferior  and  lateral 
orliits  pale.  S;Mitellnni  of  the  same  co!or  as  the  upper  side  of  the 
thorax,  and  lieset,  hesides  the  usual  h;  islles,  with  a  few  short  hairs. 
Pleurae  frrayish-frreen,  their  posterior  iiiartrin  yellowish.  The 
sid;'s  of  the  al)d(tmcn  near  its  hasis  sonn-wliat  yellowish  and  trans- 
parent ;  on  the  posterior  margin  of  il.s  first  segiiieiit  there  are  long 


iitlii 


i;r> 


PirTEIlA  (IF  NORTH  AMKUIf'A. 


[part  ir. 


■^ 

0 

1 

■ 

im 

■■■ 

l)lii(;k  Itristlcs,  on  the  posterior  Jiiiiiyin  of  the  other  sofriiiciits  there 
are  only  very  short  ])ristles.  Venter  as  far  as  the  tip  yellowish. 
Ilypopyjfiuin  rounded,  small,  rather  imbedded;  its  Itlaekish  a]»- 
peiidajres  very  short  and  therefore  not  distinctly  ]"jrceptil)le. 
Coxie  and  feet  yellowish  ;  fore  coxie  oidy  at  the  ti}>  with  a  few 
hlaek  l)ristles,  otherwise  in  front  with  short  and  very  delicate  white 
hairs.  The  short  hairs  upon  the  feet  are  black  ;  umhfr  side  of  the 
fore  femora  glabrous  ;  middle  femora  upon  the  under  side  with  a 
row  of  short  black  bristles.  P'ore  tibiic  on  the  upper  side  with  a 
dense  row  of  black  hairs,  upon  the  lirst  quarter  of  the  hind  side 
with  a  single  very  small  black  l)ristle.  ^Middle  and  hind  tibiie 
(»idy  with  a  few  short  black  bristles  ;  the  end  of  the  latter  is  some- 
what thickened  and  of  a  brownish-black  color.  Fore  tarsi  plain, 
from  the  tip  of  the  first  joint  blackened;  the  first  joint  not  quite 
as  long  as  the  other  four  taken  together.  The  lirst  joint  of  the 
miihllo  tarsi  nearly  as  long  as  the  other  four  taken  together,  stalk- 
like,  a  little  thicker  at  the  end  and  of  a  whitisli  color;  the  second 
joint  very  much  llattened,  whitish,  the  apical  margin  bordered  with 
Idack;  the  third  and  f(»urth  joints  also  flattened,  and,  with  the  fifth 
joint,  which  is  not  flat,  of  a  deep  black  color.  Hind  tarsi  as  far  as 
the  middle  of  the  second  joint  brown,  then  black;  the  first  joint  is 
a  little  stouter  and  shorter  than  the  second  and  has  upon  the  middle 
of  its  under  side  a  black  bristle  which  is  a  little  curved  backwards. 
"Wings  hyaline,  tinged  with  lH*owuish-gray ;  the  third  and  fourth 
longitudinal  veins  show  towards  their  end  a  slight  eonv"rgoncy. 

Female.  The  third  joint  of  the  antenme  rounded-oval,  very 
much  shorter  than  in  the  nuile  ;  the  second  joint  of  the  antenniD 
overreaches  the  inner  side  of  the  third  only  by  a  rounded  lobe. 
Face  less  dusty  than  in  the  male,  very  broad,  by  i;ir  not  reaching 
the  lower  corner  of  the  eye  ;  its  lower  part  is  voy  conve.v  and 
protrudes  in  the  shape  of  a  njof,  wherelty  the  mouth  becomes  very 
large.  The  black  palpi  consideral)ly  larger  than  in  the  male. 
Feet  j)lain,  the  hind  tibiie  not  thickened  at  the  end  and  only  very 
slightly  infuscated.  Fore  tarsi  from  the  tip  of  the  first  joint  gra- 
dually becoming  more  infuscated  ;  middle  tarsi  from  the  tip  of  the 
first  joint  blackened,  though  the  root  of  the  second  joint  is  some- 
what paler ;  hind  tarsi  at  the  root  brown,  black  towards  the  end. 
The  little  black  bristles  upon  the  under  side  of  the  middle  femora 
are  missing.     The  rest  as  in  the  male. 

llah.   Sitka.     (Sahlberg.) 


P'lrlii- 


SYNARTimUS. 


]:]7 


Ohxervafion. — Si/nlormon  tarsatuti  1ms  upon  the  upper  side  of 
tlie  first  joint  of  tlie  antenme,  (juite  in  the  vieinily  of  tiic  Imsis,  ii 
few  almost  imperceptible  little  hairs,  which  I  am  unable  to  per- 
ceive in  the  present  species,  so  that  I  am  compelled  t(»  locate  it 
into  the  genus  Si/narthnof.  It  is  further  distiufruished  from  »S//"- 
tonnon  tarsa/ua  by  the  shorter  arista  and  by  the  broader  winji's, 
which  are  less  narrow  towards  the  root.  Besides,  in  the  male  the 
tip  of  the  hind  tibiie  is  less  thickened,  the  second  joint  of  the  mid- 
dle tarsi  is  l)roader,  of  a  whitish  color,  and  has  only  at  its  tip  a 
black  marjrin,  while  in  the  male  of  S;p>lormoii  ta7'satuti  it  is  less 
))road,  yellowish  upon  the  middle  of  the  root  and  black  u]»on  the 
whole  apical  half  The  relation  which  exists  l)etween  Synai^lhrus 
jHilinaris  and  Sijnloruion  farsatut^  is  exactly  the  same  as  that  be- 
tween Hynarlhrus  pallipes  and  Hijnl<jrnion  Zclleri. 

2.  S.  cinereiveutris  Loew.      f . — Viridis,  coxis  anticis  pedibusqiie 
flavis. 

Green,  fore  coxae  and  feet  yellow.     Long.  corp.  0.13.     Long.  al.  0.13. 

Syn.   Sijnarthrus  cinereivcntris  Loew,  Neue  Beitr.  VIII,  48,  1. 

Female.  Shining  metallic-green.  Face  very  broad  ;  the  infe- 
rior porticm  protrudes  considerable  in  the  shape  of  a  roof,  so  that 
the  palpi  are  rather  concealed  and  the  mouth  becomes  unustudly 
large ;  the  blue-green  ground  color  of  the  face  is  rather  covered 
by  a  gray-whitish  powder.  Anteniiie  black,  rather  large  for  a 
female ;  the  second  joint  overreaches  the  inner  side  of  the  third 
with  a  broad  lobe  ;  the  third  joint  is  short,  but  very  broad,  beset 
with  very  short  but  distinct  hair ;  the  arista  is  distinctly  longer 
than  the  antennic.  The  front  in  the  middle  is  almost  blackish- 
green,  about  the  aui.'nniP  steel-blue,  on  the  ujipor  corners  ratiier 
violet  and  may  possibly  vary  a  little  in  its  coloring.  Cilia  of  the 
upper  orbit  black,  those  of  the  lateral  and  inferior  orbits  white. 
Thorax  shining  metallic-green,  with  very  thin  and  almost  imper- 
ceptible, nearly  whitish,  dust.  Abd(»men  also  shining  metallic- 
green,  on  the  lateral  margin  with  but  little  percei)tible  whitish 
powder.  Tenter  whitish-gray.  Fore  coxie  yellow,  with  delicate 
whitish  hair  and  no  black  hairs  or  bristles.  Middle  and  hind 
coxaj  blackish  with  yellow  tip,  the  former  green  on  the  front  side, 
and,  like  the  fore  coxae,  beset  with  delicate  whitish  little  hairs. 
Feet  yullow ;  tarsi  gradually  dark  brown  towards  their  end,  but 


'    i 


7'  ^i.J,  ^ 


138 


DIPTERA  OF  NORTH  AMERICA. 


[part  II, 


w 

1     :    ' 

%t 

m  A 

SO  lliat  the  first  joint,  with  the  exception  of  its  tip,  is  dark  yeUow. 
and  llie  seeoiid  j<jiiit,  witii  the  oxeeptiou  of  its  tip,  is  brovvnisli- 
vellow.  Tlie  hind  tarsi  are  visll)lv  siiorter  than  the  hind  tibia.', 
and  the  first  Joint  is  loiiffer  tlian  the  second.  The  yellowish  tefru- 
lie  have  a  narrow  (Kirii-brown  niarfrin  and  yeil(jwish  cilia,  whicli 
in  some  directions  assnme  a  very  darli  color.  Ilalteres  yellowish. 
\Vinsi;s  jrrayish ;  the  last  scfrnient  of  the  fourth  lonjritudinal  vein 
not  distinctly  inflected  ;  i»osterior  transverse  vein  steep. 
JIab.  Middle  States.     (Osten-Sacken.) 

II.   Lower  part  of  tfie  occiplt  with  .i  strong  beard. 

3.  S.  liarliatUH  Loew.      %  . — Viiidis,  pedibus  flavis,  femoribus  postieis 
viriditius. 

Green,  feet  yellow,  liind  femora  green.     Long.  corp.   0.12 — 0.13.     Long. 

al.  0.1 2. 
Sy.\.   SyiKirlhrus  harhaUts  Loew,  >'eue  Beitr.  VIII,  48,  2. 

Shininj?  nietallic-frreen.  T'ace  green,  and  dull  on  acconnt  of  a 
moderately  thick  yellowish-white  dust,  which  however  docs  not 
conceal  the  frround  color.  V'a\\V\  a  little  larjrer  than  those  of  the 
nnilcs  of  >';nKirtlirus  in  general ;  they  have  also  a  more  disengaged 
j)osition,  a  bright  yellow  color,  and  are  beset  with  a  few  black 
little  hairs.  Antennie  black;  the  second  joint  reaching  only  a 
little  on  the  inside  of  the  third,  almost  of  transverse  form  ;  the 
rather  strikingly  hairy  third  joint  is  l)road  only  about  the  basis 
and  Ix'coMU's  elongated  into  a  narrow  and  very  long  point;  the 
arista  is  entirely  apical  and  only  half  the  length  of  the  third  joint. 
Front  metallic-green,  little  shining.  Cilia  of  the  U|)per  orbit 
))la<k,  .short  and  delicate;  cilia  of  the  lateral  and  inferior  orl)its 
very  long,  white  ;  they  form  with  the;  hair  on  the  lower  part  of  the 
occi))iit  a  striking  beard.  Thorax  and  scutellura  metallic-green, 
the  former  less  shining  on  account  of  a  cover  of  pale  dust,  the  lat- 
ter sometimes  more  bluish-green.  Abdomen  metallic-green.  The 
last  segments  assume  in  some  directions  a  rather  black-green 
color.  The  snndl  imbedded  hypopygium  black  ;  its  outer  append- 
ages Imve  the  f()rm  of  snudl  lamella)  and  are  of  a  brownish  color ; 
the  inner  appendages  are  not  distinctly  ])erceptible.  J"'ore  coxaj 
l)liickisli,  on  the  front  side  greenish-blue;  their  delicate  hairs  are 
])rincipally  white,  Imt  towards  the  ))asis  of  the  eoxie  there  are  also 
eoijie  black  hairs ;  on  the  tip  are  black  bristles.     Middle  and  hind 


SYNAUTiiuu:? — systi:nus. 


139 


coxrc  ))lack  ;  the  fonncr  with  Itlack  hairs  and  l)rislles.  Fore  foot  yel- 
low ;  femora  iiierassated  towards  tlieir  basis,  on  the  upper  side  with 
a  narrow  brownish-hlaek  longitudinal  stripe,  reaehinj^'  to  the  ex- 
treme ti]);  the  under  side  is  sparsely  frinji,ed  with  short  hlaek 
liairs,  and  where  these  end,  there  are  three  Ijlaek  hrislles  turned 
somewhat  baekwards.  Fore  tibia;  et)vered  witli  thick,  rather 
coarse,  but  short  hairs.  Fore  tarsi  from  the  tip  of  the  lirst  joint, 
whieli  is  al)out  as  lonj;  as  the  others,  slron<?ly  infuseated.  The 
lirst  and  second  joints  l)eset  on  the  under  side  with  short  bristle- 
like hairs;  pulvilli  rather  larjre.  Middle  feet  yellow;  femora 
thickened  about  their  basis;  the  tibia;  have  Itesides  the  bristle  at 
the  tip  only  one  on  the  upper  side,  not  far  from  tin;  l)asis;  the 
tarsi  are  very  much  infuscated  from  the  tip  of  the  second  joint. 
Hind  femora  metallic-ji-reen  witii  yellow  tij),  at  the  end  of  the 
under  side  with  a  few  black  l>rist!es.  Hind  til>iie  yellow,  oidy 
sparsely  bristled.  Hind  tarsi  yellow  at  the  l^asis,  from  the  ti[>  of 
the  lirst  joint  Ijlack-'orown  ;  their  joints  (le<'rease  in  leiijith,  the 
first  considerably  lonjier  than  the  second.  The  cilia  of  the  whitish 
te,u:ulie  show  in  most  directions  a  brownish-l)lack  colorinjr,  while 
in  some  they  appear  with  a  yellowish  lustre.  Jlalteres  yellowish. 
"Winffs  fiTayish  hyaline  with  l)rownish-black  veins ;  the  posterior 
transverse  vein  is  straifrht  and  has  a  very  steep  jjosition  ;  the  last 
segment  of  the  fourth  longitudinal  vein  shows  upon  its  lirst  third 
an  almost  iinpercepUble  llexure,  otherwise  it  very  little  approaches 
the  third  longitudinal  vein,  runs  parallel  with  it  and  terminates 
precisely  in  the  ape.\  of  the  wing. 

Hub.   Middle  !Stu^.  ..     (Osten-Sacken.) 


'^11"' 


^ .?'  : 


Gen.  XVII.     SYSTEXl'S. 

This  genus,  hitherto  coiiiined  to  European  species  only,  may  be 
characterized  in  the  following  manner:  First  joint  of  the  antennio 
without  hairs  on  the  npjter  side;  the  second  joint  transverse;  the 
third  large,  ictnger  in  the  male  than  in  the  fenude,  in  Itolh  se.xes 
broad  at  the  basis,  ending  into  a  point,  distinctly  hairy;  arista 
completely  apical.  Feet  rather  slender,  in  l)oth  sexes  plain  and 
beset  oidy  with  very  few  and  short  bristles.  The  lirst  joint  of  the 
hind  tarsi  without  bristles  and  scarcely  half  the  length  of  the 
second.  The  sixth  longitudinal  vein  of  the  wings  distinct.  The 
abdomen  of  the  male  towards  the  tip  and  laterally  much  com- 


W 


■     •!.  ■* 


Ifffl 


liQ 


DII'TERA  OF  NORTH  AMERICA. 


[.'ART  II. 


pressed,  its  last  segment  mirrow.  Tlie  basal  portion  of  the 
entirely  (lisen<riige(l  and  inlleeted  iiypopyji'inni  lornis  a  lonj^ 
pednnele  •  tlie  <»uter  aitpendnjres  sir-ratlier  lliilorni  and  whitish, 
tiie  inner  appenchij^^es  alst).  Tlie  last  segment  of  the  fourth  longi- 
tudinal vein  with  more  or  less  tlexure. 

The  name  of  the  genus  (from  avv,  together,  and  ottvof,  narrow) 
has  referenee  to  the  very  jiointed  shape  oi'  the  third  joint  of  tlio 
aatennui,  whieh  is  peculiar  to  both  sexes. 


Oen.  XVIII.    RIIAPIIII  Iff. 

The  first  joint  of  the  antennse  has  no  iiairs  on  the  upper  side; 
the  second  is  transverse  ;  ♦  '  third  glabrous,  very  narrow,  in  both 
sexes  very  much  elongated,  though  in  the  nnde  more  so  than  in 
the  female.  Arista  entirely  a))ical,  l)arc  ;  its  first  joint  somewhat 
elongated  in  the  nmle.  Scutellum  glal)rous.  nypoj)ygium  small, 
rounded,  rathe,  imbedded  ;  its  outer  apjiendages  more  filiform  than 
lamelliform ;  the  inner  api)en(lages  small  ;  the  first  joint  of  the 
hind  tarsi  without  bristles. 

The  genus  Rhaphlum  stands  in  next  relatiim  to  the  genera 
Po7j)hijroj>s  and  Xiphandrium.  With  the  species  of  Porjihijnip.f 
it  shares  the  larger  size,  the  greater  number  of  bristles  on  the 
feet,  the  broader  wings,  less  narrow  towards  the  basis.  With  the 
species  of  Xipfunxlriiim  it  has  in  common  the  great  elongation 
of  the  second  joint  of  the  antenuio,  the  lesser  density  of  hair  on 
the  occiput,  and  the  shorter  hair  n])on  the  coxic  and  feet,  also  that 
the  last  segment  of  the  fourth  longitudinal  vein  is  less  inflected. 
From  both  these  genera,  however,  lihaphiiim  is  distinguished  by 
the  somewhat  longer  first  joint  of  the  aiitenme,  which,  particularly 
in  the  male,  is  rather  swollen  :  'iv  the  great  narrowness  and  the 
glabrousness  of  the  third  joiiu,  wliich  is  uncommonly  elongated 
not  oidy  in  the  male  but  also  in  the  female  ;  by  the  glabrousness 
of  the  arista,  and  finally,  by  the  more  narrow  and  more  pointed 
palpi  of  the  female.  The  other  genera  most  closely  approaching 
Ithophium,  as  Sysfeniis,  Synarthrtis  and  Smilintiis,  cannot  be 
easily  confounded  with  it,  the  hypopygium  of  the  male  in  the  spe- 
cies of  St/.'^tenus  being  very  much  pedunculated,  the  second  joint 
of  the  atitennte  in  the  species  of  Si/narthrus  reaching  over  the 
third,  and  the  abdomen  in  Smiliutus  having  only  five  segments. 


RirArun.M — xipnANnnnM. 


141 


The  nnme  of  tlio  gt'iius  (I'roin  ^utioi-,  siiiiill  iifrdlc)  has  rofort'iiee 
to  tlie  shape  of  the  untoiimi',  which  distiiijfiiislK's  it. 

Only  a  siiiglt'  European  and  one  North  American  species,  de- 
8eriijed  below,  are  known  at  present. 


\ 


I.  R.  lllgllbre  Loew.      f- — ^^^  viridi  nigrum,  nitens.  pedibns  nigiis, 
anttii'iuruiii  tibiis  iiitern)mli<iiuiu(iue  ftiiiioribus  lutei.s. 

Oreeiiish-Mack,  shining;  feet  black  ;  the  four  anterior  tibi;e  and  tbeniidille 
femora  dusky  yellow.     Long.  (!orp.  0.1  (J.     Long.  al.  0.1(j. 

yvN.  lihitjihiinn  liii)iil)re  Loew,  Nnue  Beitr.  VIII,  4i),  1. 

Of  a  bright  metallic,  but  very  dark  greenish-black  color.  Face 
moderately  broad,  with  a  bright  lustre  of  silvery-white  powder 
upon  l)lack  ground.  l*al|)i  black  with  white  jiowder.  The  bhu  k 
antenna.'  very  long,  narrow  and  glabrous  ;  the  a]»ical  l)ristle  sl'-n-t 
and  bare.  Front  shining  black.  Cilia  uf  the  npjter  orbit  l)iack. 
delicate,  short;  cilia  of  the  lateral  and  inferior  orbits  white. 
Thorax  bright,  with  an  ahnost  imperceptible  gray-whitish  dust. 
The  scutellum  has  n(»  hair  with  the  exception  of  the  usual  brisiles. 
Abdomen  bright,  only  on  the  lateral  margin  with  distinct  white 
})owder ;  the  hair  upon  it  is  black.  Coxtu  black  with  white  dust ; 
the  front  siide  of  the  fore  coxie  with  white  hair  and  black  l)ristles. 
Anterior  femora  l)Iack  with  luteous  tip  ;  fore  tibiie  luteous,  only 
with  two  bristles  on  the  upper  side  ;  fore  tarsi  blac.'k,  the  first  joint 
as  far  as  the  tip,  luteous.  Middle  feet  luteous,  tarsi  from  the  tip 
of  the  first  joint  blackened.  Hind  feet  entirely  black,  only  the 
knot  4  yellow;  the  first  joint  of  the  tarsi  scarcely  a  little  longer 
than  the  second.  Cilia  of  the  brown  teguhe  whitish.  Wings 
blac]  ish,  on  the  fore  margin  and  along  the  veins  darker;  the  last 
segment  of  the  fourth  longitudinal  vein  only  in  the  middle  gently 
inflected  forward. 

JIab.   Carolina. 

Gen.  XIX.     XIPHAl^DRirHI. 

The  genus  Xiphondn'um  comi)rises  small  species,  of  slender 
form,  with  little  hair.  The  first  joint  of  the  antennic  has  no  hair 
on  the  upper  side;  the  second  is  of  a  transverse  form,  the  third 
rather  narrow,  in  the  male  very  much  elongated  and  in  the  female 
much  slnirter ;  the  hairs  upon  it  are  distinct,  especially  on  the 
under  side.      Arista    entirely   apical,   comparatively    short,    with 


I,      ; 


■ 


.        I      'I 


142 


DIPTKKA  OF  NOIITII  AMERICA. 


[part  II. 


soaiTC'ly  perceptible  short  puljesceiice.  The  lower  jjiirt  of  tlio 
occiput  only  with  the  u.su;(l  f'riiip"e  of  cilia.  8<'Ul('iiuin  witlioiit 
hair.  Coxie  ami  feet  coiiii)arutively  hare,  the  lallor  witii  very 
few  l)ristk's;  tiie  first  joint  of  the  hind  tarsi  without  hristles. 
Winj^s  not  very  broad,  soinewhiit  nnrrowed  towards  tlie  btisis;  the 
last  >('<rnicnt  »tf  tlie  fniirtii  long'itudiiiai  vein  little  indectcd  ;  liypo- 
pvfritnn  small,  roiiiideti,  rather  imltcddcd,  its  outer  appcndufrcs 
more  filiform  than  himelliform  ;  the  inner  appendajjes  small. 


The  next  related  jrenera  are  lUuijiltiuui  awl  J'orji/ii/i-oj 


IX. 


T 


characters  of  the  genus  Jifidjiliinni  have  already  l)een  described 
The  species  of  Xiplxindriain  differ  from  the  species  of  J'lD'pfn/rof.^ 
by  their  smaller  si/e,  more  slender  form,  less  hair,  especially  on 
the  lower  part  of  ti.e  occiput  and  ou  the  coxie ;  the  third  joint  of 
the  anteiniie  of  the  males  is  more  eiongiited,  more  distinctly  hairy, 
l)articularly  on  the  wliole  lower  side ;  the  arista  is  beset  with  a 
comparatively  short  but  easily  perceptible  puliesceiice  ;  the  wings 
are  less  broad  and  towards  their  l)asis  still  narrower.  It  cannot 
l)e  mistaken  for  the  genera  Sijs/einifi,  SijDnrtfn'us  and  Smiliofiifi, 
as  they  'lifYer  from  Xiiihandrium  and  Ithaphium  hy  tlie  same 
distinctive  marks. 

Tlie  name  (from  ^c'toj,  sword,  and  dirjp,  man)  has  been  given  to 
this  genus  on  account  of  the  sword-shapc^l  antennse  of  ilie  male. 

Out  of  Europe,  no  sj)ecies  of  XijiJinndrium  are  as  yet  known. 
I  have  a  fenuvie  from  North  America,  which  probably  belongs  li> 
this  genus.  As  it  has  lost  its  antennaj,  its  systematical  locatinn 
could  not  be  ascertained. 


» 

■fltti'  ;•■ 

^■As 

I 

iiL.-''>' 

\ 

Gen.  XX.     PORPIIVROPS. 

The  genus  Porjifn/i'o^ts  com))ris(.'s  species  of  at  least  middle 
sixe,  rather  stout  shape  and  very  hairy.  The  first  joint  of  the 
antennae  has  no  hairs  on  the  u)>iier  side  ;  the  second  is  transverse  ; 
the  third  is  moderately  elongated  in  the  male  and  shorter  in  the 
female ;  the  hairs  upon  it  are  very  short  and  the  whole  under  side 
(with  the  exception  of  a  few  s|)ecies)  is  entirely  bare.  Arista 
altogether  apical  with  an  almost  imperceptible  and  very  sh(»rt, 
pubescence.  The  under  side  of  tlie  occiput  more  or  less  densely 
fringed.  Scutelhim  without  hairs.  Coxa^  and  feet  with  rather 
much  hair  and  bristles.  P"'irst  joint  of  the  hind  tarsi  without 
bristles.     Wings  conijtaratively  broad,  towards  the  basis  only  a 


i»0HPUYll()P8. 


Ui 


little  narrower;  the  last  sofrinoiit  of  the  fourth  longiiudimil  vein 
niodenilely  iiiHeeted.  llypopyjjiiiiu  simiil,  roiiiulcd,  rather  im- 
bedded, its  outer  a|»iteiuhi>^es  almost  in  all  the  spceies  more  I'll- 
form  than  lamellirorin  ;  the  outer  ap[)eiidajj:es  smul!. 

With  ref^ard  to  the  mutual  relation  of  the  three  kindred  genera 
namely,  Jilniphiiim,  Xijihundriain  and  rorj)fii/roj)s,  all  the  re- 
quired iid'ormation  inis  already  been  furiushed,  so  that  a  repetitio  \ 
of  their  distinetions  is  not  neeessary.  I  have  vindicated  the  naino 
of  l'urjtlii/roj)n  for  this  jjeiius  in  the  tifth  volume  of  the  Nrue 
Heitriige.  An  entirely  unfounded  opposition  had  been  raised 
against  it.  The  following  are  the  reasons  by  whieh  I  hnvc  been 
governed  with  relation  to  the  luime  rorpliifropn.  Mcigcn,  in 
the  fourth  volume  of  his  works,  luis  taken  a  wider  view  of  tho 
genus  Porphynqui  ami  divided  it  into  three  sections:  1.  With  a 
subaj)ical  arista.  2.  With  an  apical  arista;  and,  J],  With  an 
arista  inserted  dorsally  on  the  third  joint,  near  the  basis.  In  his 
seventh  volume  he  ado])ts  the  genus  Arrjiira,  which  M.  Mac(|uart 
had  in  the  meantime  established  for  the  first  of  the  three  divisions  ; 
the  third  division  he  unites  with  Mcdeh'ru>i ;  and  for  the  oidy 
renniiinng  second  division,  which  j)rinci]>ally  contains  sMccies  of 
the  present  genus,  he  retains  the  mime  of  P(»r])h!/ro}»-  ;  at  the 
same  time  he  uintes  with  them  the  species  of  his  genus  Ithnphium 
(that  is  the  genera  lihajihium  and  XipJiandniim  in  the  sense 
adopted  above).  As  I  cannot  Jigree  with  this  reunion,  I  am  com- 
pelled to  retain  the  name  of  /'orphi/rops  for  the  genus,  which 
embraces  most  of  the  species  contained  in  Meigen's  second  division 
and  this  is  the  present  genus. 

The  name  Porphi/rops  (from  jtoptviio.  scarlet,  and  w^,  fa<'e)  lias 
reference  to  the  beautiful  scarlet  color  which  is  peculiar  to  the  eyes 
of  many  species,  especially  the  males. 

The  hitherto  known  species  of  Porphjp'opit  are  distributed  all 
over  Asia  Minor,  Europe,  and  North  America. 


'  •'    >     M 

• 

! 

ll^^^^B^^  r 

15 
1 

Table  for  the  determlnutiou  of  the.  Specicx. 


(  Feet  black. 
*  Feet  yellow. 


(All  t 
(  Fore 
I  Fore  cox 
*  Fore  cox 


All  the  coxiB  black, 
coxfe  yellow. 


cjB  not  blackened  at  the  basis, 
coxffi  blackened  at  the  basis. 


1  melampus  /"•. 
2 

2  nigricoxa  /  "'. 

:i 

3  fumipennia  /"•• 

4  rotundiceps  lie. 


m 


.'i^ 


144 


PIPTKK.V  OF  NOUTU  AMKIIKW. 


[r.VUT  n. 


Dencrl/itlon  of  the  S/iecies, 

1.  P.  llielunipilH  LoKw.    %  iitid  9  .— I'tMlibuH  atria,  alls  iiigricantilius. 

I'V.'t   liluuk,  wings  blackixh.     Long.  oorp.  0.17 — 0.18.     Long.  al.  0.14 

0.15. 

BvN.   I'oriifii/rops  milampns  Loi:\v,  N«uo  Ik'itr.  VIII,  .')(•,  1. 

Male.  Metallic  bliu-kish-f^roeii.  Fuco  very  narrow,  with  white 
(hist.  J'alpi  hiack  with  wliite  (lust.  Aiiteiiiiu;  l)hick  ;  third  juint 
ratlier  loiij,'  and  pointed  ;  arista  more  than  half  the  lenfrth  of  the 
third  joint.  Front  hiack-ffreen,  with  white  dust.  Cilia  of  the 
nj»por  orbit  black,  those  of  the  inferior  snow-white.  Upper  side 
(if  the  thorax  shininj?,  only  on  the  anterior  and  lateral  niarf,nn  with 
more  distinct  white  dust;  on  the  former  the  Itc^rinnin^  of  two 
darker  colored  lines  is  per(.'ei)tible.  The  scutellum  has  no  hair 
besides  the  usual  bristles.  The  brijfht  and  dark->^reeii  abdomen 
has  scarcely  a  trace  of  white  dust ;  its  last  sef?ment  is  alnntst  l)lack. 
The  hypopvfrium  is  a  little  lar^jer  than  in  most  of  the  other  si)e- 
cies  of  this  ffcnus,  brijjht  black  ;  the  outer  aj)pendages  are  ex- 
tremely snuvll  black  laniello!  frinji^ed  with  black  hair;  the  brown 
interior  ap{)cndages  are  also  small,  turned  a  little  uj)ward.s  at  the 
end,  Imt  pointed  and  uj)on  the  middle  of  the  lower  side  fringed 
wit!i  a  few  hairs.  The  hair  upon  the  abdomen  is  black,  only  on 
the  lateral  margin  of  the  anterior  segments  and  upon  the  venter 
whitish.  Coxie  black,  with  a  rather  thick  white  powder,  the  fore 
and  middle  coxiu  with  considorai>I('  white  pubescence  and  without 
any  black  bri.stles.  Feet  Idack ;  femora  with  a  trace  of  blackisli- 
green  lustre ;  the  tip  of  the  trochanter,  the  tip  of  the  knee,  also 
tiie  extreme  tip  of  the  fore  and  middle  tibiaj  brownish-yellow  ;  the 
first  joint  of  the  fore  tarsi  a  little  longer  than  the  three  following 
togetlier,  at  the  end  of  the  under  side  dilated  almost  in  the  sha])e 
of  a  tooth  ;  otherwise  the  feet  have  no  particular  distinction.  The 
cilia  of  the  pale-yellowish  tegulaj  have  whitish  hair.  Halteres 
pale-yellowish.  AVings  blackish,  in  the  vicinity  of  the  second 
half  of  the  anterior  margin  rather  bla(;k  ;  the  last  segment  of  the 
f  )urth  longitudinal  vein  only  very  little  inflected  forward  in  the 
middle. 

Female.  The  only  specimen  which  I  have  ])efore  me,  strikingly 
diflers  from  the  described  male  in  the  color  of  the  body ;  as  all  the 
other  characters  coincide  jjcrfectly  with  those  of  the  male,  I  have 
not  the  least   doul>t  that  both  belong  together  and   consider  the 


m 

■■■  I' 

mM: 

^ 

jfe^:: 

In 

rolU'lIYROl'S. 


14: 


(lilVcrcnce  in  tlio  color  as  only  uccidciitul,  ns  it  so  often  occurs  in 
tlio  Jh>lii;hoj)oih'(lit  Fiicc  iiiodcrntciy  broad,  with  silvcry-wliitu 
(lust.  I'ttlpi  Itlacli  with  white  dust.  AntcnMiu  sliort,  the  tidrd 
joint  small  and  uvute ;  arista  three  tiines  the  lcn;;th  ol'  ihc  antcn- 
nie.  Front  bine  with  thin  white  dust.  L'pperside  uf  the  Ihora.x 
steel-blue,  upon  the  middle  and  towards  the  hind  inar;fin  more 
violet.  The  steel-blue  scutelluni  uiton  its  iniildle  is  also  ofa  vio- 
let color.  The  alnlomen  is  dark  metallle-j,n'een,  its  la.U  .scj,nnent 
rather  l)laek-{ircen  at  the  basis,  otherwi.se  bright  steel-blue.  'I'lie 
iiuir.s  on  the  fore  eoxte  are  like  tho.se  of  the  nuile,  only  less  dense 
and  shorter;  the  hair  on  the  middle  ti.xie  is  also  whitish,  the  wi-ak 
brisilcs  in  the  vicinity  of  its  tip  arc,  however,  l>lack.  The  wings 
are  the  same  as  those  of  the  males,  only  the  blackening  of  the 
second  jmrt  of  the  fore  margin  is  stronger  and  the  fourth  longitu- 
dinal vein  with  the  posterior  transverse  vein  have  a  darker  seam. 
Tin-  remainder  like  in  the  male. 
llab.  District  Columbia.     (Osten-Sacken.) 

3.  1*.  nigricoxa  Loew.     J- — PecHbus  flavis,  coxia  omiiilms  et  totia 
uigris. 

Feet  yellow,  all  tlie  coxa)  entirely  black.     Long.  corp.  0.22.     Long.  al. 

0.23. 
Sy.n.  Porjihyrops  nigricoxa  LoEW,  Neue  Beitr.  VIII,  ,>],  2. 

FoHitli'.  Metallic-green,  front,  thorax  and  scutellum  very  cop- 
pery. Face  with  yellowish-gray  dust ;  the  sejtanition  between  its 
upper  and  lower  part  is  jiarticularly  striking.  J'alpi  compara- 
tively small,  black  with  yellowish-gray  dust ;  antenna;  black  ;  third 
joint  ovate;  ari.sta  Ij  the  length  of  the  antcniuv.  Front  with 
thin  yeilowi.sh-gray  dust,  t'ilia  on  the  upper  orl)it  black,  on  the 
lateral  and  inferior  orbits  white.  All  the  coxoe  entirely  black,  with 
gray  dust  and  whitish  hair;  at  the  end  of  the  fore  and  middle 
coxa!  there  are  no  ))lack  l)ristles.  Feet  yellow,  apical  half  of  the 
hind  femora  black,  the  last  third  of  the  hind  tibiii)  aiid  the  hind 
tarsi  altogether  arc  of  the  same  color;  middle  and  fore  tarsi 
strongly  infuscated  from  the  root  and  towards  the  end  black. 
Cilia  of  the  yellowish  tcgulai  white.  Ilaltcrcs  i)ale-yellowi.sh. 
Wings  gray,  on  the  fore  margin  more  brownish  gray ;  the  last 
segment  of  the  fourth  longitudinal  vein,  beyond  the  middle,  gently 
inflected  forward. 

Ilab.  Maryland.     (Osten-Sacken.) 
10 


#1 


:f,!ii 


140 


MI'TFRA  OB'  NORTH  AMF.RK'A. 


[I'AUT  ir. 


:i.   V,  fiiniiiteniiU  Lui:\v.     9-~''"*'>^u^  lliivis,  ooxis  anticln  toti« 
roiicolorilnis. 

Fuet  with  the  fore  coxo)  altogothor  yi'llow.     Long.  corp.  0.18.     Long.  tx\. 

0.17—0.18. 
8yx.   Piirpltijrops/nmipriiiiis  LoRW,  Nouo  Heitr.  VIII,  51,  3. 

Fcmnlc.  Urifyht  int'tallie-grcen.  Fuci'  with  pale  yellowish*, 
frniy  dust.  I'lilpi  lihu-k,  witli  yt'llowisii-gniy  dust.  Autcniia! 
Whu.'iv  ;  the  third  joint  suiuil,  rounded-ovate  ;  arista  at  least  three 
times  the  lenj^th  of  the  unteniue.  Kntut  hlue-frreeu,  with  a  pale 
yellowish-}?ray  dust.  Cilia  oi"  the  ui»per  orbit  bhiek,  those  of  the 
lateral  and  inferior  white.  Tlnjra.v  with  a  thin  but  rather  distinet 
j^rayish-yellow  dust.  Fore  co.xie  yellowish  with  white  hair ;  on 
their  tips  anionj?  the  white  luiirs  there  are  a  few  black  l)ristles, 
not  easily  perceived.  Middle  and  hind  eo.xie  blackish  with  yel- 
lowish tip  ;  the  front  side  of  the  middle  eo.va;  is  clothed  with  white 
hair  and  toward.s  the  tip  with  a  few  black  bristles;  hind  fenioni 
blackish-brown  at  the  tij) ;  fore  and  middle  tarsi  infuscated,  black- 
ened towards  the  end;  the  last  third  of  the  hind  tibiiu  and  the 
hind  tarsi  black.  Cilia  of  the  pale-yellowish  tcuiihe  whitish; 
halteres  ]»ale-yellowish.  Winj^s  tinjred  with  browiiish-ffray  ;  the 
last  segment  of  the  fourth  longitudinal  vein  gently  inllected  fur- 
ward  upon  its  middle. 

Hah.  Middle  States.     (Osten-Sacken.) 


I'vV  ',  ' .■ 


4.  P.  rotlllltliceiis  LoEW.     %. — Pedibus  flavls,  coxis  anticis  conco- 
loribus,  basim  versus  nigris. 

Feet  and  fore  coxie  yellow,  the  latter  in  the  vicinity  of  the  root,  black. 
Long.  corp.  O.IG.     Long.  al.  O.lli. 

Syx.  Porphyrops  rotundiceps  Lokw,  Neue  Beitr.  VIII,  51,  4. 

Male.  Bright  metallic  green.  Face  very  narrow,  with  silvery- 
white  dust,  palpi  black  with  pale  dust.  Antenna;  black;  the 
third  joint  not  very  long  for  a  nude,  rather  rounded  at  the  end  ; 
arista  about  as  long  as  the  ontenuic.  Front  metallic  green. 
Cilia  of  the  upper  orbit  black,  of  t!ie  lateral  and  of  the  inferior 
orbits  white.  Upper  side  of  the  thorax  bright,  with  very  indis- 
tinct white-grayish  dust.  Scutellum  in  part  steel-blue.  Abdo- 
men bright  metallic  green ;  in  the  vicinity  of  the  lateral  margin 
with  rather  distinct  whitish  dust ;  the  narrow  last  segment  rather 
steel-blue ;  the  liair  black,  on  the  lateral  nnirgin  and  upon  the 


m'v^^. 


.s'iii.Kiri  f». 


Ut 


itor  wliitish. 


li 


hhuk  ;   til 


VPiitor  whitisn.  I  he  siiiiill  liy]ni|»yirMiiii  hltick  ;  the  exterior  iip- 
jM'iidiiirt's  lire  of  11  dusky  j,n'uy-y('llo\vi,v|i  color,  coiiipiinitivrly  Iohl', 
forlv-sliii|)c(|  and  split  into  a  sliorirr  mid  a  iiiiirli  joiiirtr  iiilrriial 
liilio  ;  tlio  lionilikc  interior  appendu^^'s  are  Idaek  and  pointed. 
Tlie  yellowisli  fore  coMe  are  npoii  tlieir  wlicdu  liasiil  half  (»f  a 
l»ro\viiisli-ldack  eolor,  and  fringed  on  the  front  side  with  loii}? 
whitish  hairs.  There  are  no  black  bristles  upon  them.  .Middle 
coxa'  blackish  with  ycdlowish  tip,  the  hitler  with  a  considerable 
iilack  thorn,  which  seems  to  be  composed  of  several  conti^nioiis 
bristles.  Hind  co.Xie  of  the  same  color  as  the  middle  coxie.  Feet 
yellow  ;  hind  femora  almost  upon  the  wh(de  apical  half  black  ; 
hind  til>i!e  altiioii<rh  stroiijr,  but  not  incrassateij,  their  last  third 
black.  Fore  and  middle  tarsi  somewhat  infiiscated,  their  end  and 
the  tip  of  their  lirst  joint  more  dark  brown  ;  the  first  joint  of  the 
fore  tarsi  of  tluMisnal  form,  the  hind  tarsi  black.  Cilia  of  the  pale- 
yellowish  te^nliii  whitish.  Wiiiffs  tinp'd  with  frrny,  a  little  darker 
upon  the  last  part  of  their  anterior  maririu  ;  the  hist  seffinent  of 
the  fourth  longitudinal  vein  gently  inflected  forward  npoii  its 
middle. 

JIub.  District  Columbia.     (Osten-Sacken.) 


'"^I^^ 


''j;i 


Gen.  XXI.     SltllLSOTl^S. 

Charactcm.  Face  in  both  sexes  broad.  I'alpi  large,  concealing 
the  proboscis.  The  antenme  in  both  se.xes  of  a  .similar  structure  ; 
the  lirst  joint  on  the  upper  side  without  hairs;  the  second  of  the 
usual  transverse  form;  the  third  joint  of  difiereiit  length  in  dif- 
ferent species,  on  the  under  side  nearly  e.xeised  from  the  root  to 
the  tij);  the  arista  entirely  a))ical,  the  first  joint  short  and  stout, 
the  second,  however,  long,  very  slender,  particularly  towards  the 
tip.  Scutelluni  without  hair.  The  abdomen  of  the  male  shows 
only  five  segments,  whih;  there  are  six  in  the  related  genera. 
The  small  rounded  liyi)0)>ygium  is  imbedded  and  has  only  very 
short  apjiendages.  All  the  tarsi  are  short,  esj)ecially  the  hind 
tarsi,  the  lirst  joint  of  which  has  no  bristles  ;  the  pulvilli  of  the 
fore  tarsi  of  the  male  are  enlarged.  The  wings  are  ehuigated,  of 
rather  eipial  breadth,  and  have  a  distinctly  protruding  anal  angle  ; 
the  last  segment  of  the  fourth  longitudinal  vein  is  somewhat  in- 
flected, ends  beyond  the  tip  of  the  wing  and  runs  upon  its  middle 
over  a  large  but  flat  impression. 


•n- 


'' r'J'^'ff 


148 


PirrEIlA  OF  XOKTIt  AMEIirCA. 


[part  ir. 


This  genus  has  been  cstablislied  l)y  Mr.  Hiiliday,  and,  in  con- 
sideration of  the  almost  swordlike  f'»rni  of  the  antenna;  of  ihe 
species  which  became  first  know"  was  called  il/«(V /rr/»m  (from 
ndxai^a,  the  sword).  As  <his  same  name  lias  already  been  used  for 
a  genus  of  ])lants,  I  liave  thought  tit  to  abandon  it  and  to  sui)sti- 
tute  the  name  of  Hniili<ilt(s  (from  o^iXiwrdj,  the  pruning-knife, 
because  the  third  joint  of  the  anlentue  in  the  two  known  species 
has  the  form  of  a  pruning-knife). 

The  two  known  species  belong  to  the  European  fauna. 


Oen.  XXII.     AIMIROSIXI'S. 

The  known  species  of  yl/^/iro,>///(/,s  agree  in  the  following,  in 
part  rather  striking  peculiarities  which  conslitutc  tlu^  character  of 
this  genus.  Tlie  first  joint  of  the  antenna*  without  hair,  the 
seccmd  of  tlio  usual  transverse  form,  the  third  tapering  at  the 
tip ;  the  arista  entirely  ai»ical.  The  face  narrowed  above,  esjie- 
cially  in  the  male.  The  proboscis  turned  towards  the  breast. 
rali»i  disengaged,  hanging  downward,  in  the  male  larger  tlian  in 
the  female.  The  alxlomen  of  the  male  shows  six  segments  ;  the 
siiort  and  rounded  hypopygium  ends  it  in  the  shape  of  a  knol»; 
its  exterior  appendages  are  clont>:ated,  parallel  lamelUe,  fringed 
with  rather  long  hair.  The  female  abthjmen  has  only  five  seg- 
ments. Wings  of  rather  e(pnvl  breadth  ;  the  posterior  transverse 
vein  is  less  distant  from  the  margin  of  the  wing,  than  its  own 
length  ;  tlie  eml  of  the  fourth  longitudinal  vein  is  parallel  with  the 
third.  Feet  with  rather  coarse  bristles;  the  first  joint  of  all  the 
tarsi  is  much  longer  than  the  second  ;  the  first  joints  of  the  hind 
tarsi  without  bristles. 

The  structure  of  the  proboscis  and  the  position  of  the  palpi 
distinguish  the  si)e<'ies  of  Jjihrof<;/li(.-i  sulliciently  from  all  the 
other  genera  of  Jtolichojwdithc.  Hitherto  only  European  species 
have  been  described. 

The  name  of  the  genus  (fri)m  ati'05,  the  froth,  and  ovxaw,  I  rob) 
has  i"ference  to  the  habit  of  these  species  to  pursue  their  prey 
along  the  shores  of  a  surging  sea. 

Gen.  XXIII.     TIIIIVOPIIILI  S. 

Chnrocfers.  The  face  in  both  sexes  broad,  m)t  reaching  as  far 
as  the  lower  eye-corner,  and  ending  below  at  an  obtuse  angle. 


■j. 


TFiixonnn 


-I'EODES. 


14!) 


Piil)>i  ill  both  soxos  lurfro,  reposing  upon  \hv  pmlMsris.  Aiitciiiiii! 
voi'v  t-lit»rt  ;  the  lirst  jctiiit  without  liair,  tiic  second  sliort,  tnius- 
v<'rse,  h)n,uTr  aliove  than  below;  the  tliinl  joint  circular,  tlie  bare 
arista  dorsal.  Winji's  of  ecjiial  l)readtli  ;  the  jxisterior  transverse 
vein  is  distant  from  the  maririu  of  the  wiiii^  more  than  its  own 
IcMjjth  ;  the  last  se.u'ineiit  of  the  loiirtli  lonji-itudinal  vein  is  rather 
liandlcl  with  the  third.  The  abdomen  of  the  male  has  six  seji,-- 
nients  ;  the  liypopyjriuni  small,  rather  iml)ed<led,  and  somewhat 
turned  inside;  its  exterior  api)enda<r<'s  are  narrow,  jjaraiiel  lamelhe. 
The  abdomen  of  the  fciiiale  shows  iive  seirmeiits,  Kemora  rathri' 
stronjr,  the  first  joint  of  the  hind  tarsi  without  bristles. 

The  species  of  I'hiiKi/iJn'lHS  are  easily  distinjruished  from  the 
s])ecies  of  l)i(ifitrai-uf<  l)y  the  absence  of  hair  upon  the  lirst  jomt 
of  the  antenna' ;  from  the  species  of  Piixlva  they  dilfer  by  the 
structure  of  the  face  and  of  the  hyi)opy<>:inm. 

They  live  priiicii)ally  alonjr  the  shores  of  tlie  sea,  whence  their 
name  (from  ^ij,  down,  sand  hill,  and  ^i.-Koi,  friend). 

As  yet  only  European  species  have  been  made  known. 


':  1- 


Gen.  XXIV.     PRODEN. 

Characters.  Face  not  reachinj?  as  far  as  the  lower  corner  of 
the  eye,  rather  narrow  in  both  sexes,  tlioutrh  a  little  broader  in  the 
female,  and  more  enhu'fred  lielow ;  the  lower  marji-in  is  strai<i'ht. 
Pal]»i  in  the  female  considerably  lar<!:er  than  those  of  the  male  and 
ill  both  sexes  reposinjr  u]ion  the  ]iroboscis.  Antenme  very  short  ; 
the  lirst  joint  without  hairs;  the  second  short,  transverse;  the 
ttiiid  joint  rounded  ;  arista  dorsal,  only  with  a  short  pubes- 
cence. Wings  of  uniform  breadth  ;  tlie  ]tosterior  transverse  vein 
is  reiiiovf'd  from  the  inarfiMii  of  tlie  winir  more  than  its  own 
Icuirlh  ;  the  hist  seirnieiit  of  the  fourth  lonjritudinal  vein  parallel 
with  the  tliinl.  The  aluhjiiien  of  the  male  has  six  scirments;  the 
short,  st'/iit  hyj>opy<>'iiiiu  is  not  imbedded,  but  disenfraire(l  and  a 
little  inllectefl  ;  its  <'Xterior  niipeiidaii'cs  are  two  small  parallel 
huuelhe  aloiij^side  of  cacii  (ttlicr  aii<l  with  lonu:  hair  ;  the  interior 
ap]»eiidajres  form  a  rcmarkalily  lar<r('  curved  Ibrceiis.  The  abdo- 
men cf  the  female  shows  live  sejiMiieiits.  The  femora  are  rather 
stronj;  ;  the  lirst  joint  of  the  hind  tarsi  has  no  Itristles. 

Pcodes  is  closely  related  niily  to  'J'/n'iKi/i/iiluti  ;  the  din'erences 
become  evident  when  the  characters  of  liolh  genera  are  compared. 


■A 


ir)0 


DIPTEllA  OF  NORTH  AMERICA. 


[I'.VUT  If. 


'I'lio  iiaiiic  of  tlio  froiiu.s  (from  ntuiijt:,  provided  with  a  largo  ])ouis) 
lias  iTfereiico  to  om-  of  its  most  strikliig  charactor.s. 

Only  one  Europt'aii  species  has  as  yet  been  made  known. 

Gen,  XXV.     M EMATOPROCTIS. 

Characters.  Antenn*  short ;  first  joint  without  hair  ;  second 
joint  short,  transverse;  third  joint  small,  in  the  male  not  laiticr 
than  in  the  female,  rounded  ;  the  rather  long  arista  entirely  dor- 
sul.  The  faee,  much  narrower  in  the  male  than  in  tiie  fcnnde, 
does  not  reach  as  far  as  the  inferior  corner  of  the  eye.  I'alid  re- 
jtosing  ui)()n  the  prolioscis,  those  of  the  female  nuich  larticr  than 
those  of  the  nmle.  Front  of  etjual  breadth.  The  lower  part  cf 
the  occiput  distinctly  ))ear(led.  Eyes  very  hairy,  especially 
towards  the  lower  corner.  Scutellum  not  hairy.  The  abdomen 
of  the  male  has  si.x  segments;  the  small  rounded,  and  a  little  im- 
bedded, hypopygium  is  at  its  tip ;  the  exterior  appendages  are  long 
and  filiform,  the  interior  appendages  very  short  and  usually  not 
distinctly  i)erceptible.  The  female  abdomen  shows  live  segments. 
AVings  a  little  narrowed  towards  the  basis,  the  (irst  longitudinal 
vein  not  elongated  ;  the  ])osterior  transverse  vein  distant  from  the 
margin  of  the  wing  by  more  than  its  own  length  ;  the  last  segment 
of  the  fourth  longitudinal  vein  very  gently  inflected  and  towards 
the  end  i)arallel  with  the  third.  Feet  rather  strong  ;  ]>ulvilli  of 
the  fore  tarsi  not  enlarged  ;  the  first  joint  of  the  hind  tarsi  without 
bristles. 

The  species  of  Nemafojn'ocfus  mostly  resemble  in  their  habitus 
the  species  of  PorphyrDps  ;  they  differ  from  them,  howevei-,  by  ww 
altogether  different  stru<'ture  of  the  antenna';  the  third  joint  of 
the  male  being  also  very  short  and  the  position  </f  the  arista  com- 
pletely dorsal.  They  are  less  closely  related  to  the  species  of 
Artii/rn,\o  which  they  were  formerly  reckoned,  as  the  first  joint  of 
the  antennai  is  without  hairs,  the  third  joint  of  the  nmle  is  not  en- 
larged, Imt  as  small  as  that  of  the  female,  the  arista  not  suba.i)ica.l 
l>ut  entirely  dorsal,  the  first  longitudinal  vein  of  the  wings  not 
ehtngated,  further,  the  exterior  appendages  of  the  hypopygiuni 
Imve  not  the  sha])e  of  short  lamelhc,  but  of  long  threads.  The 
species  of  XiniatojiroctiDi  agree  with  the  s])ecies  of  LcKcoHfola  in 
the  glabrousuess  of  the  first  joint  of  the  antenna) ;  otherwise  they 


4  ■Ifi 


LETJCOSTOLA, 


151 


differ  from  tliem  prceist'ly  in  the  same  manner  as  from  the  species 
Anji/ni. 

The  name  of  the  genus  (from  vr^fia,  the  thread,  and  rtpwxroj,  po- 
(h':v)  has  reference  to  the  threatl-like  form  of  the  exterior  ap- 
pendaffes  of  the  hypopygiuni.  The  species  hitherto  known  are 
all  European. 


Gen.  XXVI.     ].EtTCOSTOI.A. 

The  species  of  Leuroslola,  like  those  of  Aniyra,  have  usually 
upon  the  abdomen,  and  often  also  upon  the  thorax,  a  thick  hril- 
liant  silvery  dust,  which  renders  them  easy  to  i'ecojrnize.  The 
lirst  joint  of  the  anteinue  is  entirely  hairless,  the  second  is  trans- 
verse, tlie  third  bare,  rather  lartre  in  the  male  ;  the  ai)i)arently 
bare  and  distinctly  two-jointed  arista  is  very  near  the  tip  of  the 
antenniB.  AV'injrs  broad,  the  jjosterior  anjrle  rather  protrudiiiji; ; 
the  first  longitudinal  vein  is  farther  from  the  margin  of  the  wing 
thi'i  in  most  of  the  other  genera,  and  is  also  much  longer  than 
usual ;  the  fourth  longitudinal  vein  is  inflected  forward  before  the 
middle  of  its  last  segment,  thence,  iiowever,  again  parallel  with 
the  third  ;  the  posterior  transverse  vein  is  not  api)roxiinated  to  the 
nnirgin  of  the  wing.  The  tirst  joint  of  the  hind  tarsi  has  no 
l)ristles.  lIypoj)ygium  small,  imbecUled  ;  its  exterior  appendages 
are  two  small  narrow  lameihe,  bent  downward;  the  interior  aj)- 
peiidages  are  of  rather  simple  structure,  and  often  not  distinctly 
visible. 

The  c-lose  relationship  of  the  genus  LeucoHtola  to  that  of  Afgi/ra 
can  e  esisily  jierceived  by  a  com))arison  of  their  characters.  There 
is  .-ciirceiy  any  difference  between  them,  but  that  the  first  joint  of 
tiie  antenuic  of  Lcitcoxtohi  is  entirely  without  any  hair,  while  in 
Arijiira  it  is  distinctly  covered  with  hair. 

The  niime  of  tiie  genus  (IVoni  Xfvxo;,  white,  and  sroxr.  dress)  has 
reCereiice  to  the  beautil'id  silvery  lustre  which  covers  the  abdijmen 
and  sometimes  also  the  thorax  of  most  of  these  species. 

The  known  species  belong  in  part  to  Europe  and  in  part  to 
America. 


152 


DII'TKUA  OF  NOUTH  AMERICA. 


[part  iT. 


>.r'tv" 


a':i,-*,»,..» 


'■,*,: 


^:Mii 


1.  I^.  ciiigulata  Lokw.     %. — Viridis,  Isete  splendeiis,  aMomine  Kon 
lioUino.so,  ciiigulis  llavis. 

Green,  brightly  shining,  abdomen  without  white  dust  and  with  yellow 
bands.      Long.  corp.  0.19.     Long.  al.  OIG. 

SvN.  Lcticostola  ciiKjuldta  LoEW,  Neue  Beitr.  VIII,  53,  1. 

3[oIe.  Fiice  very  narrow,  silvcr\--white.  Palpi  snow-wliitc. 
Proboscis  brownisli-blaek.  Antoiuiaj  blaclc ;  the  tliird  joint 
blac'k-lu'own  ;  the  arista  inserted  close  to  its  tip.  Front  black 
with  silvery-whito  dust.  Cilia  of  the  upper  orbit  black,  extremely 
short  and  delicate;  cilia  of  the  inferior  and  lateral  orbits  snow- 
white.  Thorax  metallic  preen,  very  britiht,  dusted  only  on  the 
lateral  marfrin.  Scutellum  of  the  same  color,  without  hair,  besides 
the  usual  bristles.  Abdomen  without  any  white  dust ;  the  first 
sejrment  mostly  black  ;  the  second  yellowish,  transparent,  with 
metallic  black  border  on  the  ])osterior  niarf«-iu  and  with  an  indis- 
tiuct  blackish  spot  near  the  middle  of  the  anterior  margin  ;  third 
seirment  also  yellowish,  transparent,  and  at  the  basis  with  a  rather 
broad  violet-black  transverse  stripe,  bisinuated  on  the  hind  side, 
and  with  a  narrow  blaekish-grcen  border  on  the  posterior  margin  ; 
the  coloring  of  the  fourth  segment  of  the  abdomen  is  the  same, 
but  the  bands  on  the  fore-margin  and  the  posterior  border  are 
broader,  h»  that  the  yellow  ])art  of  the  segment  has  the  ai)pear- 
aiice  of  being  divided  into  two  spots ;  the  fifth  segment  has  no 
yellow  color,  but  is  violet-black  near  its  basis  and  black-green 
towards  the  tip.  The  same  color  prevails  on  the  small  hypo])y- 
gium,  the  extremely  small  lamella;  of  which  are  brownish.  The 
rather  Wng  bimt  not  very  coarse  hair  upon  the  abdomen  is  chiefly 
black,  oidy  upon  the  fore  part  of  the  first  segnu'nt  and  upon  the 
venter  it  is  yellow-whitish.  Coxa^  and  feet  ])ale-yellowish  ;  fore 
coxic  with  white  hair  and  yellowish-white  little  bristles.  Middle 
and  hind  coxa;  near  the  basis  a  little  blackened  and  also  fringed 
with  pale  hairs  and  bristles.  Femora  slender,  the  hind  ones 
slightly  infuscatcd  at  the  tip  on  the  upper  side.  The  hair  u])on 
tlie  femora  is  blackish  on  the  upper  side  and  near  the  tip,  whitish 
near  the  basis  and  on  the  underside;  the  very  delicate  wh'»i^h 
hair  on  the  umler  side  of  the  fore  and  middle  femora  is  rather  long. 
Fore  tibia;  without  any  bristles  ;  middle  and  hind  tibia;  only  with 
rery  few  delicate  and  short  bristles.  Fore  and  middle  ta'-si  si  mi- 
der,  but  not  very  long ;   the  first  j(jint  about  as  long  as  the  others 


EUTAKSUS. 


152} 


lakoii  tof>:ctlior.  Tlio  first  joint  of  tlio  liiiid  tarsi  is  sliorlcr  tliaii 
the  socoiid  and  a  little  stouter,  especially  towards  the  tij);  it  is 
frin<,^ed  with  the  usual  short  hair,  which  is  however  unusually 
dense  upon  the  latter  part  of  the  under  side.  Cilia  of  the  black 
niartrined  tegula;  yellowish-white.  "^'111)^:8  short  ami  broad  ;  the 
posterior  transverse  vein  strikinjfly  far  distant  from  the  nuirjiiu 
of  the  winft";  the  last  segment  of  the  fourth  longitudinal  vein  be- 
fore its  middle  gently  inflected  forward. 

Hub.   District  Columbia.      (Osten-Sacken.) 

Ob.serration. — A  rather  badly  preserved  female,  which  I  pos- 
sess, I  su])pose  to  be  that  of  Levcoi'tola  cinifulafn  ;  it  shows,  how- 
ever, some  differences,  so  that  it  nuiy  belong  to  some  other  closely 
related  species.  It  differs  from  the  above  described  male  by  the 
following  characters  :  The  face  is  comparatively  l)road  and  covered 
with  a  dense  glittering  silvery-white  powder.  The  white  palpi 
are  larger  than  those  of  the  n)ale.  The  third  joint  of  the  antenme 
is  very  short ;  the  position  of  the  arista  almost  apical.  The  ab- 
domen is  yellow  with  the  exception  of  the  last  segment  which  is 
of  a  metallic-green  color,  shows  however,  when  looked  upon  in  an 
obli(iue  direction,  an  indistinct  greenish  lustre ;  its  penidtimatc 
and  antepenultimate  incisures  are  greenish-black  towards  the  lateral 
margin.  The  ])osterior  nmrgin  of  tlie  pleurie  is  mit  gray,  but  yellow. 
Among  the  whitish  hair  of  the  fore  coxse  there  are  a  few  light- 
brown  bristles,  which,  in  a  certain  direction,  have  a  black  ai)j)ear- 
ance.  The  tip  of  the  hind  femora  is  not  darker  and  the  first  joint 
of  the  hind  tarsi  is  of  the  usual  plain  structure,  however  compara- 
tively of  the  same  length  as  that  of  the  described  mnles.  Other- 
wise it  coincides  with  it  perfectly.  The  only  character  wliich 
makes  it  doubtful  whether  they  belong  together  is  the  yellow  color 
on  the  hind  margin  of  the  pleunc  in  the  female. 

Hah.   District  Columbia.     (Osten-Sacken.) 

Gen.  XXVII.     El'TARSUS. 

Characters.  Face  narrow,  esjx'cially  in  the  male  ;  a  little 
broader  u))wards.  Palpi  very  sn\ail.  The  first  joint  of  the  an- 
teiHiai  without  hair,  the  second  much  overreaching  the  third  ;  the 
third  rounded  ;  the  arista  dorsal,  thouu'h  rather  closely  a))pro.\i- 
mated  to  the  tip  of  the  third  joint,  distinctly  two-jointed.  The 
elongated,  cylindrical  abdomen  of  the  male  consists  of  six  scg- 


n  ^ 


^  •' 


'!-•■ 


m    ' 


i  - 

1: 


i! 


i.it< 


154 


nil'TKUA  OF  NUllTII  AMKUICA. 


[r'R 


r  ir. 


nu'iils;  the  liyiM»|nMriiiiii  is  very  siiuill,  oiitiri'ly  imbedded  and 
witlioal  bristles  ;  its  appeiidiiffes  are  extremely  small,  almost  eom- 
j)letely  liiddeii.  The  lemale  alt(k)iiieii  shows  only  live  se;i'iiieids. 
Feet  rather  lonji:,  moderately  bristly  ;  the  lirst  joint  of  the  hind 
tarsi  wiliioiit  bristles,  mneh  shorter  than  llio  second;  the  i»ulvillL 
on  the  fore  tarsi  of  the  male  are  enlarged,  but  not  elongated. 
AVings  of  rather  uniform  breadth  or  narrower  towards  the  root  ; 
the  (Irst  longitudinal  vein  not  elongated;  the  last  segment  of  the 
fourth  longitudinal  vein  tho\igh  somewhat  indeeteil,  still  rather 
parallel  with  the  third.  J'Jtdarsas  a}>i>ears  to  be  nearer  related 
to  Didp/ionin  than  to  any  other  genus.  The  striking  smallness 
of  tlie  palpi,  the  faee  narrowed  belov/,  the  hypopygium  covered 
with  but  delicate  hairs,  the  very  small  and  almost  completely  con- 
cealed a])pendages  of  the  liyi)oj)ygium  and  the  not  elongated  pul- 
villi  of  the  fore  tarsi  in  the  nuile  distinguish  Eittarsus  from 
])i(i/i/i(tntf<  sulliciently.  From  Xcnui/ojirorttts,  whose  exterior 
appendages  of  the  hypopygium  are  long  threatls  covered  with 
hair,  /-Jutartius  is  distinguished  by  the  snuUl  and  concealed  ap- 
pembiges  of  the  hyj)opyginm.  The  species  of  Saucrojius  cannot 
be  confounded  with  the  species  ul'  Uutaraus  on  account  of  the  en- 
tirely disengaged  hypopygium. 

The  genus  has  been  founded  upon  tlie  well  known  European 
Juilai'sus  aulicus  Meig.  The  name  (from  d,  handsome,  and 
■roprxij,  foot)  has  reference  to  the  structure  of  the  feet  of  the  male. 

As  yet  no  North  American  species  is  known  to  me,  but  I  know 
a  species  from  Venezuela,  the  liind  tarsi  of  the  male  of  which 
have  a  remarkable  structure,  and  of  which  1  furnish  a  descrii)tion. 

1.  E.  eques,  u.  sp.  %. — Clialylnnis,  niodice  niteiis,  alxlominis  ex 
■iMieo  iiigri  maculis  latoralil)us,  ventre  iXMlibusqiK^  llavis,  feinorilms  pos- 
ticis  supra  til)iis(jue  posticis  totis  fuscis,  tarsis  auterioribus  priPter 
basiin,  posticis  totis  nigris,  articulo  hoium  priiuo  brevissimo,  quarto  in 
aculeum  prodiicto. 

Stoi'l-l)lue,  moderately  shining;  lateral  spots  of  tht^  bronze-black  abdonieii, 
venter  and  feet  yellow  ;  upper  side  of  the  hind  femora  and  the  whole 
hind  tibiie  brown  ;  the  four  anterior  tarsi  with  the  exception  of  the  root, 
and  the  whole  hind  tarsi  black;  the  lirst  joint  of  the  latter  very  short, 
the  fourtii  joint  produced  into  a  point.  Long.  corp.  0.27.  Long.  al. 
0.2(i. 

j\f(ile.  Front  shining  steel-ldue,  not  very  In-oad,  not  excavated 
ou  the  vertex.     Antemue  only  of  moderate  length,  black ;  the 


m 


k-\\' 


ELTARSUS, 


l->5 


jiarrow  mid  a  little  oloiifjated  lirst  joint  is  entirely  l)are  on  the 
upper  side,  on  the  lower  edjre  of  a  ratiier  distinctly  reddish-yellow 
color  ;  the  third  joint  is  short  ovate  ;  the  arista  is  inserted  upon 
the  baek  of  the  third  joint,  nearer  to  its  basis  than  it  is  the  case 
with  t'uldrsK!^  aiilicu.-^.  The  face  is  very  narrow  ininiediately 
below  the  antennie,  and  jirows  more  and  more  so  till  it  becomes 
ouueiforni,  so  that  the  larjj,e  eyes  are  entirely  conti}i:uous  on  a  lar^e 
extent.  Palpi  very  suudl ;  proboscis  rather  small.  Thora.x  steel- 
blue  or  violet,  little  shininji',  ujjoii  the  shoulders  more  blnc-;^i',.cii 
and  more  densely  covered  with  dust;  the  extreme  cornea'  of  the 
shoidder  brownish.  Scutellum  of  the  same  color  as  the  upper 
side  of  the  thorax  and  with  two  bristles.  ^Metathorax  and  ])l('ura! 
black-green,  the  latter  with  whitish  dust  and  a  yellow  hind  mar- 
gin. Abdomen  eylintlrical,  blackish  bronze-colored  ;  the  second 
segment  has  near  the  basis  a  narrow  yellow  transverse!  stripe, 
which  is  somewhat  dilated  near  the  lateral  nnirgin  ;  and  upon  the 
hind  comers  a  large  yellow  spot  ;  there  are  similar  spots,  but 
diminishing  in  size,  upon  the  other  segments.  The  sninll  liyp(»- 
l)ygiuni  is  rounded  and  rather  imbeddetl ;  its  apj)endages  an; 
short,  indistinct  lamellio.  The  short  hair  upon  tin;  abdonn-n  is 
black;  longer  black  l>ristles  only  on  the  hind  mai-gin  of  the  first 
segment.  Coxa-  and  feet  yellow  ;  fore  coxie  with  \nik'  hair,  at  the 
tip  oidy  with  a  few  thin  I)lack  little  bristles;  middle  coxa'  with  a 
large  black  spot,  which  covers  about  three-(puirters  of  their  (uiter 
side ;  the  hind  eoxse  with  a  small  blackish  spot.  The  hind  femora 
on  the  upper  half  of  their  hind  side  blackish-brown  ;  fore  and  mid- 
dle tibia;  only  at  the  extreme  tip  slightly  infuscated  ;  the  hind 
tibia'  totally  black-brown.  The  fore  tibiie  are  without  l)ristlcs; 
the  middle  and  hind  tibiie  are  but  sparsely  beset  with  short  bris- 
tles. J'Ore  and  middle  tarsi  from  the  tip  of  the  first  joint  l)lack- 
brown,  ])lain  ;  the  first  joint  of  the  fore  tarsi  is  .somewhat  shorter 
than  the  following  taken  together,  the  first  joint  of  the  middle  tarsi 
longer  than  the  others  taken  together.  The  hind  tarsi  are  bla<'k, 
very  much  shorter  than  the  hind  tibitu  and  of  a  very  pecidiar  sti'ui- 
ture ;  the  first  joint  is  remarkably  shortened,  the  second  4  j  the 
size  and  the  third  2h  the  size  of  the  first ;  the  fourth  joint  has  only 
the  length  of  the  first,  its  end,  however,  is  produced  into  a  stout 
thorn,  so  that  with  it  this  joint  is  not  much  shorter  than  the  third  ; 
the  fifth  joint  is  not  at  the  cud  of  the  fourth,  but  attached  on  its 
under  side  at  the  place  where  the  fourlh'joint  begins  to  be  pointed  ; 


ii 

i 

' 

j^^^Uj 

, 

.'>■■;. I   ■ 

;•    i 


lofi 


DII'TKHA  OF  NORTH  AMKUICA. 


[i>ai;t  ir. 


oi)  )»uili  tarsi  if  is  nillici"  siiijiiiliirly  jit  ri.trlit  tuij-lcs  with  the  foiirtii 
joint,  is  soiiicwiiat  loiiiriT  than  tho  tliird  Joint  and  Iuik  the  I'oiin  of 
a  sit'ndcr  cliil).  Tho  {jrayish-liyaline  \viim:s  arc  nitlier  hn\^  and 
narrow;  llicir  anal  anjile  is  rather  rounded  nil";  tlio  last  sofrnient 
of  tho  fonrth  lon^;itndinal  vein  runs  upon  its  iniddlo  over  a  dis- 
tinct convexity  of  tho  wing  and  is  there  a  little  inflected  ;  towards 
its  end  it  does  not  mnch  approach  the  third  lonp-itiidinal  vein, 
which  is  here  very  gently  carved  hackwards  ;  the  sixth  longitndi- 
nal  vein  becomes  entirely  indistinct  at  a  considerable  distance 
from  tho  nnirgin  of  the  wing. 

JInJ).  Veneznehi.     (Moritz.) 

Ohftrr  I'd  lion. — Altlntngh  tho  present  species  differs  in  some  re- 
spects from  J'Jiifarsiis  aKlirUf!,  still  it  coincides  in  nnniy  imp(»rtant 
characters  with  it,  so  that  it  cannot  bo  located  into  any  other 
genns,  nnless,  rather  preinatnrely,  a  new  gonns  is  created  for  it. 
J'Ji(/(irsKi<  nulicHti  approaches  the  forms  which  prevail  in  the  genus 
Diaphorus  more  than  the  above  described  species. 


Gen.  XXVIII.     DIAPHORUS. 

At  the  time  of  its  adoption,  and  long  after,  tho  genus  Diaphorus 
was  considered  as  one  which  was  very  distinct  from  tho  genus 
Clirynutiis.  The  characters  which  Aleigen  uses  for  tlieir  dis- 
tinction are  the  following :  for  Chrysotun,  arista  apical,  the  eyes 
of  the  nude  contiguous  under  the  antenna},  and  the  wings  some- 
M'hat  divaricated  when  in  repose ;  for  Diaphorus,  arista  dorsal, 
eyes  of  the  male  contiguous  on  the  front,  and  the  wings  reposing 
upon  each  other  when  at  rest. 

The  more  species  of  these  two  genera  have  become  known  and 
the  more  carefully  they  have  been  examined,  the  more  unsatisfac- 
tory Meigen's  characters  have  been  found.  North  America  is 
particularly  rich  in  species  belonging  here,  but  showing  important 
structural  deviations. 

Besides  the  species  showing  a  different  structure  of  the  thorax, 
and  which  were  formerly  classed  with  Chrysotus,  but  are  uinted 
now  in  the  genus  Chri/Hotimiis,  the  other  species  of  Chrysotus, 
agreeing  in  their  habitus,  are  divided  in  such,  the  males  of  which 
Imve  eyes  contiguous  under  the  antennix?,  and  in  such,  where  the 
eyes  are  separated  by  the  sometimes  broad  face  ;  the  position  of 


kLSI^'i.'iiii 


DlAPIIOIirS. 


l.u 


the  arista  is  likewise  by  no  inciins  nlways  npionl ;  on  the  contrary, 
it  is  even  subapieal  in  the  majority  of  tlie  species. 

The  same  happens  to  be  tlie  case  witli  J)i(i]>horiiff,  wlierc  the 
eyes  of  tlie  males  are  contifjuons  npon  the  front  in  some  of  the 
spef'ies  only,  while  in  others  they  are  separated  by  the  broad  front ; 
ih"i  arista  likewise  is  not  always  distinctly  dorsal,  bnt  in  iiiany 
species  snl)api('al,  and  in  some  truly  apical.  Thus  nonr'  of  the 
distinctive  marks,  which  Meijren  had  established  for  these  two 
genera,  holds  good,  except  for  (Jhrysotus,  the  wings  divaricated 
in  repose,  and  the  parallel  wings  for  Ih'apfiorutf.  As  this  churac- 
ter  can  only  be  observed  on  living  specimens,  it  is,  even  if  proved 
to  be  correct,  entirely  iasullicient  for  a  systematical  distinction  of 
both  genera. 

In  order  to  escape  this  difficulty  there  arc  two  different  ways  to 
be  followed  :  either  the  species,  with  the  eyes  of  the  males  not 
separated  upon  the  front,  must  rcnuiin  with  Diajihorua,  and  those 
the  eyes  of  which,  in  the  male,  are  contiguous  below  the  antennic, 
must  go  with  Chrynotua,  and  a  new  genus  must  be  estal)Iished  for 
the  species  of  Diaphornn  and  Chrijiiotus,  the  males  of  which  have 
the  eyes  distant  above  as  well  as  below  the  antenna'.  The  other 
way  to  follow  would  be  to  discover  characters  for  the  <listiii('tion 
of  (j'hrijsotus  and  Diaphorus  better  than  those  which  Meigen  had 
chosen. 

The  first  of  these  two  alternatives  is  liable  to  serious  objections. 
The  establishment  of  three  genera  would  disconnect  the  relation 
naturally  existing  between  the  insects  forming  them,  a  relation 
based  upon  their  general  habitus,  and  their  distinction  would  con- 
sist in  a  character  pertaining  merely  to  the  male.  Therefore 
nothing  remains  but  to  try  the  other  way. 

If  we  compare  first  the  species  of  Chrysotus,  in  which  the  eyes 
of  the  males  are  contiguous  under  the  antennai,  with  those  of  Dia- 
phorus,  where  the  eyes  are  not  separated  on  the  front,  we  will 
observe  the  following  distinctions  :  The  structure  of  the  body  of 
the  species  of  Diaphorus  is  more  slender,  the  abdomen  esiiecially 
is  comparatively  narrower,  and  more  elongated ;  the  hypopy- 
gium  of  the  male  has  on  the  hind  side  four  bristles  of  rather 
striking  size ;  the  feet  are  longer,  the  pulvilli  of  the  fore  tarsi  in 
the  male  are  not  only  enlarged,  but  considerably  elongated  (with 
the  exception  of  D.  nigricans  Meig.)  ;   the  wings  of  iJiapho- 


1 

till 

'  "■  'i"  fe 

,  .,-1 1 

.     .tt! 

*lf 


:     '    'r 


ins 


DIPTEUA  OF  NdUTII  AMDIUCA. 


[I'AltT  II. 


\-  Vt 


j^^plt' 

Mj^'l>^ 

l^p 

' . 

lil.'f.'-V.k; 

Ijv;' ;■■■':.': 

M  ^^■ 

iM^;>         -! 

m^..  ^ 

?v/.s'  nro  oompnrntivcly  liii'frcr,  and  Imvc  a  dillVront  outliiio,  bccauso 
the  anal  aiifrlo  is  more  protrudiiij^. 

If,  separating  the  typical  siiccies  of  Diaphoritu  from  the  typical 
spct'icrt  of  Chri/Hotus,  we  follow  out  these  characters  throu^ih  a 
series  of  those  species,  whicli,  notwithstanding  the  sei)arali(in  of 
tlieir  eyes  upon  tla;  front,  are  pliiccil  into  the  genus  Ih'ajihdnis, 
on  account  of  their  general  lial)itus  which  nppronches  the  typical 
species  of  Jfidp/inriin,  we  find  that  tiiose  among  the  ahove  nicii- 
tionecl  nnirks  of  distinction,  which  are  peculiar  only  t(»  the  males, 
hold  also  good  among  these  species;  at  least  I  do  not  know 
of  atiy  species  which,  being  placed  on  account  of  its  general 
luibitus  among  the  species  of  /Hfiphoriis,  had  not  on  the  pos- 
terior end  of  the  liyi)opygiuni  bristles  of  irreater  length  and 
remarkable  strength,  or  in  which  the  pulvilli  of  the  fore  tarsi  of 
the  nia!(>  were  not  elongated. 

It  i<  dillcrcnt,  however,  with  tliosc  marks  of  distinction  whicli 
belong  to  b.  1  sexes,  as  also  with  the  more  slender  form  of  the  body, 
.the  greater  length  of  tin;  feet,  and  the  more  projecting  anal  angle 
of  the  wings  of  the  species  of  IMaplwrus ;  each  of  these  charac- 
ters gradually  fades  away  from  species  to  species  so  that,  taken 
singly,  these  characters  are  utterly  Insullicient  to  decide  whether 
a  s]tceies  belongs  to  Diaphorux  or  to  Chrymtus.  As  it  hap))ens, 
however,  that  where  one  character  decreases,  another  one  liecomes 
more  salient,  it  follows  that  in  their  totality  they  are  suilieieiit 
to  distinguish  the  fenndes  of  both  genera,  with  the  exce])tion, 
j)erlia})s,  of  a  few  is(dated  cases.  In  doubtful  cases  it  will  be  well 
to  compare  the  deseri])ti<in  of  the  species  of  both  genera. 

The  character  of  the  genus  DiojJiortis  may,  therefore,  l)e  estab- 
lished, as  follows  :  Form  of  the  body  rather  elongated.  Eyes 
of  the  male  never  contiguous  on  the  lace,  in  some  si)ecies  sepa- 
rated upon  the  front,  in  others  not.  Antenna)  short,  the  first 
joint  bare,  the  second  transverse,  the  third  short,  distinctly  hairy, 
with  a  dorsal  or  subapical,  rarely  with  an  apical  arista.  Wings 
rather  large,  with  strongly  projecting  anal  angle,  and  thus  usually 
somewhat  broader  towards  the  basis;  the  posterior  transverse 
vein  is  either  a  little  beyond,  or  in,  or  before  the  middle  of  :lie 
wing,  never  close  to  the  margin  of  the  wing ;  the  last  segment 
of  the  fourth  longitudinal  vein  is  almost  straight,  or  but  gentl\ 
inflected,  seldom  interrupted,  so  that  its  end  is  thus  more  ap])ro.\i- 
mated  to  the  third  longitudinal  vein,  without,  however,  converging 


I)IAI'II0RU8, 


1;V.) 


towards  it.  Feet  rntlicr  Iniifr,  l)iit  not  very  slrndcr;  tlif  first  joint 
of  tilt'  liliul  tarsi  wii'iout  bristles;  the  jtiilvilli  of  tlio  fun  tarsi 
eloiigatod  in  the  niah'sof  all  spocics  ;  in  llic  iiiak's  of  soiuc  >i)i'ci('S 
the  same  is  tlic  ease  with  tlie  pulvilli  of  tlie  middle  tarsi ;  in  some 
with  the  iMdvilli  of  all  the  tarsi.  '|"h<'  hyi>o|»ygiiun  small,  indied- 
ded,  on  the  jjosterior  end  with  stouter  bristles. 

The  name  of  the  genns  (frmn  ai«>o,  oj,  dilVerent)  si<rni(ies  nothirifr 
nil  re  ImiI  that  the  species  on  whieli  tliis  geims  was  estahlished  were 
remarkaltly  dilVerent  from  the  species  of  previous  genera,  and  id 
therefore  not  at  all  eharaeteristie. 

The  known  species  of  J>ici}jlwri(s  are  found  in  f'nrope,  Asia, 
Africa  and  America. 


Table  /or  the  dctcrminatiou  of  the  Specien. 
Color  of  the  body  non-metallic,  black. 


4 

4 

6 


1  opacuB 
2  mundus 


I 


Color  of  the  body  ui«tallic-green. 

I'Y'et  entirely  yellow. 

Keet  not  entirely  yt'llow. 

Tegul.-e  with  black  cilia. 

Tei;ul!e  with  whitish  cilia. 

Kyes  of  the  male  contiguous.  3  spectabilis 

Eyes  of  the  male  not  coiitigiiou-S. 

All  the  tibire  yellow.  4  sodalis 

Only  tlie  first  half  of  the  four  anterior  tibia'  yellow. 

f)  lamellatuB,  nov 
La.st  segment  of  the  fourth  longitudinal  vein  not  interriiiitcd. 

(I  leiicostomuB 
Last  segment  of  the  fourth  longitudinal  vein  intfrrii|it.d. 

7  interniptus 


l.w. 

:i 
4 

l.w. 

sp. 

l.w. 

Lw. 


Systematical  arraiKjemint  of  the  Species. 
I.  The  eyes  of  the  male  contiguous  upon  the  front. 

1.  opacus  l.w.  3.  spectabiliB  Lw. 

2.  mundus  Lw. 

II.  The  eyes  of  the  male  not  contiguous  upon  the  Iront. 

A.  The  last  segment  of  the  fourth  longitudinal  vnin  not  interrupted. 

4.  sodalis  Lw.  C.  lamellatus,  nov.  np. 

5.  leucoBtomus  L.w. 

B.  The  last  segment  of  the  fourth  longitudinal  vein  interrupted. 

7.  interruptus  Lw. 


■'   'mn 


i 


s 


rfi!4:-l 


100 


l)ll'TK.Il.V  OF  NolVni  AMi;UI(  A. 


[I'AitT  ir. 


DeHcrijilion  of  the  S/ieclen, 
r.    TlIK  KYK8  OP  TIIK  MAI.K  CONTIOroJ  S  I fON  TIIK  FRONT. 

It  l>.  opacilH  Ldi'.w.      %  . — Toturt  iiigtT,  tibiirt  picois. 

I'hitin-ly  black,  tiliho  pitcli-brown.     Long.  torp.  0.12.     Long.  al.  0.  Ill— 
(t.i:{. 

SvN.  Diiiphnrm  opncm  Lokw,  Neue  Heltr.  VIII,  .'id,  1. 

Mdlf.  Entirely  Itliiclc.  Kaco  with  tlu;  )»iii|M  and  the  jti-Dlioscis 
Itlark,  t'litircly  ^iiild'dus.  Aiitciiiiii' black  ;  third  Jniiit  small ;  |tiisi- 
tiou  ol'thc  arista  iiioro  subapical  than  dorsal.  'I'hc  cyi's  arc  com- 
l»lctcly  contijrmius  on  the  nppcr  jtart  of  the  f'rniit  ;  iniiiiediatcly 
above  the  antciinic  a  bro\vni<h-blaek,  oitaipic,  trianiiiilar  spot  lies 
between  tlicni.  Vpper  side  of  tiie  tlmrax  and  of  the  scutelluni 
covered  with  brown  dnst  and  opacpie.  The  dnst  up(tn  the  black 
))leiira!  is  more  <i;ray-brown  and  less  distinct.  The  abdomen 
shining  Itlack,  covered  with  black  hair;  the  stron<rer  bristles  on 
the  pioterinr  ])art  of  the  hyixtpyji'iuni  very  striking-;  its  exterior 
appendnjres  very  snmll,  l)lack  ;  coxa;  and  femora  Ithick  and  witli 
))lack  hair;  fore  and  middle  femora  on  the  nnder  side  with  a  row 
of  sparse,  erect,  not  very  lonj^  lilack  hairs ;  on  the  under  side  of 
the  hind  femora  there  are  sinnlar  black  little  hairs,  which  are  less 
erect  and  somewhat  lon<fer  otdy  towards  the  end.  Fore  and  mid- 
dle til)iiu  more  yellowish-brown;  hind  tiltia'  dark-brown.  Fore 
tarsi  slender,  the  first  joint  as  lonjj,'  as  the  followinii'  three  tojirether; 
a  j^'reat  i)art  of  the  first  joint  is  yellowish-brown,  its  tip  with  the 
rest  of  the  joints  black-brown  ;  ])\Uvilli  not  very  much  enlarf^'cd 
and  only  moderately  elongated.  Middle  tarsi  black-brown  with 
vellowish-brown  basis;  hind  tarsi  entirelv  Ijlack-brown.  Halteres 
and  tetruhe  black  ;  the  cilia  of  the  latter  also  black.  AVin«rs  snioky- 
))Iackish,  towards  the  anterior  margin  darker;  they  become  visi- 
bly broader  towards  the  basis  ;  posterior  transverse  vein  but  little 
before  the  middle  of  the  wing;  the  first  longitudinal  vein  reaches 
almost  as  far  as  the  middle  of  the  anterior  nmrgin  and  is  .some- 
what distant  from  the  latter. 

JIab.   New  York.     (Osten-Sacken.) 

Oh)icrvafion  1. — D.  opanis  is  very  closely  allied  to  the  Euro- 
pean ]).  nnjrivana.  As  I  have  oidy  one  specimen  of  the  former, 
1  am  unable  to  prove  the  coincidence  of  both  species  in  all  the 


pi  J  ■:■:.  j: 


ItlAtMDHUS. 


lAl 


liiiistif  cliiiruflcrs  ns  fully  us  it  is  ncrcssarv  when  mi  Aincricaii 
>)tffics  is  In  liu  ri'n)jriii/.<'il  ns  iilcniinil  witli  u  l']iirii|M'iiii  sin'cics. 
Nt'itlici'  niii   I  iiiciitinii  liny  n-linltlc  rluiriictors  I'm*  llus  (listiiiction 

til'ltulli  species.  I  liejieve  tiiilt  tlie  eXilinilltUioli  of  11  iitr^el'  lilllil- 
I'er  of  speeinielis  will  eslaldish  tlieir  identity. 

OliKcrrafiitn  2. — I  hoiieve  I  kimw  the  female  of  P.  oporii!*,  nm 
Intwever  not  certain,  t)ii  aeeoiint  (tf  tin;  smaller  leii^'lh  of  the  lirsl 
liiii^iliidinal  vein  ami  the  ])alei' coloring  of  tiie  liiml  til)ia>.  The 
jiroboseis  of  this  female  is  remarkalily  stout  and  |»rolriidiiijf  with 
a  Mattened  tip;  palpi  rather  lar^'e  and  limad.  Face  with  an 
almost  impereeptihle  urayish  dust,  with  a  distinet  transverse  swell- 
iiiir  upon  its  middle  ;  front  with  ^■ray-l)rown  dust  and  with  a  trans- 
verse furrow  below  its  middle;  all  the  tibia*  yellowisli-lirown, 
vvin;i's  tinned  with  a  dusky  blackish  color,  tlioiin'h  not  s(»  much  as 
in  the  above  described  male,  and  towards  the  fore  mar;!'in  not 
much  darker ;  the  lirst  lon^-itiidinal  vein  reaches  ultoiit  as  far  as 
the  middle  between  tlici  extreme  root  of  the  wintrs  and  the  end  of 
tho  second  lon«;itudinal  \v\i\.     All  the  rest  as  in  the  male. 

JIab.  reniLsylvania. 


jt  'Ik. 


t:. 


\ 


*2.  D.  lllUlldlls  LoRW.      %  and  9. — Laotn  viridis,  j^'dilius  totis  tlavis. 

Light  inttailio  greeu,  all  the  feet  yellow.     Long.  corp.  0.12 — 0.13.     Long. 
al.  0.12—0.13. 

Syx.   iJinphorns  mnndns  Loew,  Neue  Beitr.  VIII,  .'57,  2. 

Liffht  .metallic  <rreen.  The  face  has  a  bluo-fjreen,  but  little 
shiniiifr,  ground  color,  which  is  riither  concealetl  by  the  distinct 
white  dust ;  it  is  somewhat  broader  in  the  female  and  has  a  dis- 
tinct transverse  swellin<r.  I'alpi  yellowish-brown,  niinli  laruer  in 
the  female  and  l)lackened  to  a  considerable  extent  towards  the 
basis.  Proboscis  dusky  yellow  or  yellowi.sh-brown.  Antenme 
brownish-yellow;  the  small  third  joint  more  infiiscated  ;  the  arista 
almost  apical ;  the  eyes  of  the  male  meet  comi»letely  on  the  upper 
part  of  the  front,  while  they  are  separated  directly  aliove  the 
antenme  by  a  trianjrnlar  sjiot  of  white  dust.  The  front  of  the 
female  is  of  entirely  uniform  breadth,  only  very  little  excecdinj;' 
the  breadth  of  the  face,  has  a  blue-green,  scarcely  a  somewhat 
shining  ground  color,  and  i.s  covered  with  yellowish  dust.  The 
cilia  of  the  upper  orbit  are  black  and,  on  account  of  their  brevity, 
11 


til 


hvfV 


m 


i 


ir.2 


DIl'TEIiA  OF  NdllTH  A>:i:ilirA, 


[part  u 


hut  cliiricnlt  to  perceive;  llie  cilia  of  the  lateral  and  inferior  orbit.s 
are  whitish.  Up])'  '  side  of  the  thorax  and  of  the  seutelluni  j)ale- 
jrreen,  with  nietallie  lustre,  covered  with  rather  thick  oehre-yeliow 
dust.  Alxlonien  somewhat  (hirker  metallic  green,  often  more  gold- 
green,  or  coppery-hrownish.  The  bristles  at  the  end  of  the  liypu- 
])ygium  are  not  very  long;  its  exterior  appendages  brownish  and 
very  small.  Co.xse  and  feet  yellow;  the  first  two-thirds  of  t lie 
middle  coxiu  blackened,  the  hind  coxic  near  the  basis  infuseated. 
The  hair  on  the  feet  ai)pears  black;  when  seen  by  a  reflected  light 
it  changes  on  the  til)iie  to  brownish  and  on  the  larger  ])ortioii 
of  the  femora  to  fallow-yellowish;  the  root,  a  part  of  the  under 
side  of  the  femora,  also  the  fore  coxse  are  distinctly  falh)w-yel!uw- 
ish.  The  tarsi  are  scarcely  a  little  infuseated  towards  their  ti()s. 
though  their  last  joint  is  of  a  dark  brown  color.  In  the  nuile  tlie 
])ulvilli  of  the  fore  and  middle  tarsi  are  consideraI)ly  enlarged  and 
elongated;  the  ])ulvilli  of  the  hind  tarsi  are  much  less  sn 
Ilalteres  and  teguhe  yellowish  with  black-brown  cilia,  which  in 
some  directions  have  a  yellowish  lustre.  Wings  grayish-hyaline. 
on  the  anterior  half  usually  somewhat  yellowish  with  y»dlowisii- 
brown  veins;  they  are  rather  large  and  towards  the  biisis  a  little 
broader,  but  their  greater  breadth  is  not  so  n(>ar  to  the  posterior 
nuirgin  as  in  the  previous  species ;  the  ])osterior  transverse  vein 
is  not  nearer  to  the  extreme  tip  of  the  wing  than  it  is  to  its  root 
and  the  first  longitudinal  vein  reaches  scarcely  above  the  hrst  third 
of  the  length  of  the  whole  wing. 
JIab.  Pennsylvania. 


iigl^ 


3.  D.  spectallilis  LoEW.  %. — Aeneo-viiidis,  f«n)oril)US  uigris,  tibiis 
tarsorumque  omnium  basi  tlavis,  ciliis  tegularuiu  iiigris,  oculiu  maris  in 
fronte  contiguis. 

Bronze  green,  femora  black,  tibiae  and  the  root  of  all  the  tarsi  yellow,  cilia 
of  the  teguloe  l)lack,  the  eyes  of  the  male  contiguous  on  the  front.  Long. 
Corp.   0.13—0.17.     Long.  al.  O.!.*)— O.ltJ. 

Stn.   D-'nphorus  spectahllis  Loew,  Neue  Beitr,  VIII,  .IT,  !5. 

Dark  metallic-green,  thorax  and  abdonu'u  more  bronze-green, 
the  former  sometimes  more  coppery.  Face  blue-green  with  thick 
white  dust,  which  conceals  considerably  the  ground  color.  I'aini 
and  proboscis  black.  Antennie  black,  small;  arista  almost  com- 
pletely apical.  The  eyes  meeting  u])(ui  the  front  to  a  large  extent 
and  sei)arated  oidy  b}  a  very  small  triangular  spot,  immediately 


in  APIIOUT^S. 


in3 


above  tlie  antcniiic.  Cilia  on  tlu'  upper  urbit  l>hu'l<,  on  the  lowci- 
and  lateral  orbits  white.  Upper  side  of  the  thorax  and  senlelhiin 
covered  with  yellow-hrovvnish  dust.  The  stouter  l)ristles  on  the 
posterior  end  of  the  very  small  hypopvffiuni  rather  strikiujf ;  hi 
exterif)r  appendages  brown  and  verysinall.  ('oxte  black  and  wit!i 
whitish  dust;  the  hair  on  the  lore  eoxie  ap]>ears  in  most  direclioii.; 
black,  in  others  fallow-brownish.  Keniora  lilack,  somt^what  witii  ii 
green  redection  ;  the  lip  of  the  Wn'c  and  middle  femora  lirownish- 
yellow;  their  black  hair,  even  on  the  under  side,  neither  of  con- 
siderable length  nor  density.  Tildse  browidsh-yellow,  ratiier 
slender,  \vith  a  few  liristles.  Fore  tarsi  very  slender,  from  the  tip 
of  the  first  joint  black-brown,  though  the;  basis  of  tiie  second  joint, 
is  again  paler  than  the  tip  of  the  first  ;  their  lirst  Joint  is  as  long 
as  the  other  four  together;  the  pulvilli  are  M'vy  much  cnlai'gcd 
and  elongated.  Middle  tarsi  of  an  entirely  similar  struct iirc,  ui' 
the  same  color,  but  their  judvilli  are  somewhat  less  enlarged  ; 
hind  tarsi  from  the  tip  of  the  first  Joint  black-brown,  their  pulvilli 
but  very  little  enlarged;  the  yellowish  teguhe  with  blackish  cilia, 
which  assume  a  yellowish  glitter  in  a  rellected  light,  llaltcrcs 
yellowish,  the  tip  of  their  knob  usually  somewhat  iiifus<'iilcd. 
Wings  tinged  with  gray,  with  blackish-brown  veins,  along  which, 
in  faded  specimens,  there  are  blackish-bntwn  margins;  they  an; 
broad,  though  their  greatest  breadth  is  not  very  close  to  the  pos- 
terior angle;  the  space  between  the  third  and  fourth  longitudinal 
veins  is  rather  wide  ;  the  last  segment  of  the  latter  shows  a  very 
gentle  flexure  ;  posterior  transverse  vein  rather  long  and  somewhat 
beyond  the  middle  of  the  wing;  the  first  longitudinal  vein  reaches 
somewhat  beyond  the  lirst  third  of  the  whole  lenglh  of  the  wings 
and  is  not  very  far  distant  from  the  anterior  margin. 
Ilab.   District  Columbia.      (Osten-Sucken.) 


■'i    »;¥" 


■■■"■'   ■  ■      «; 


.%. 


• 

H! 

V,   ..'    r, 

I"- 

r 

1 

r  '■  ■); 


;    '.i-' 


II.    The  EYK.S  OF  THE  MALE  NOT  CONTIOT'OIS  WON  THE  KlloNT 


A.  Th«  liist  segment  of  tlit^  fourth  longitudinal  vfiii  not  iiitiMTUpteil. 

4.  D.  HOdalis  Lokw.  'J,  and  9- — Aeneo-viridis,  fciuorilms  iiiiiris, 
tiliiis  ornniluis  tarsornmqne  antfrionim  basi  flavi.s,  tarsis  jiosticis  totis  i-x 
nigro  fu.sci.s,  (uliis  tegnlarutn  nigris,  otuilis  maris  in  fronto  scjtaratis. 

Bronze-green  ;  femora  lilack;  .all  the  tiliiie  and  tlie  basis  of  the  four  antf- 
rfor  tarsi  yellow;  all  the  hind  tar.si  black-brown;  i;ilia  of  tbe  tcgiil.H 


•  ^-   '  .1* 


.41 


■"  i  a\ 


1G4 


DIPTKUA  OF  XOUTII  AMKRICA. 


[PAIIT  IT. 


black;  eyes  of  the  male  separated  upon  the  front.     Long.  corp.  t>.14 — 
0.15.     Long.  al.  0.15. 

Syn.  Diaphorm  sodalix  Lof.w,  Neue  Beitr.  VIII,  58,  4. 

Kiitlier  (lark  int'ttilli(.'-p,Tt'oii,  tlio  alxlouu'ii  and  .sometime.-^  al-io 
the  thorax  more  bronzo-fjroeii,  the  t-'(;.ti'lhiin  in  one  .specimen  violet 
upon  its  middle.  Face  of  the  nude  ofunirorni  l)rea(lth,  fiTeeii-hiue 
witli  thi('i\  wliite  dust;  tiie  face  of  the  fonnde  visil)iy  broader, 
more  green,  with  le.ss  lust,  below  the  middle  with  a  transverse 
swellinjr.  Pali)!  of  the  nnde  whitish,  oidy  near  the  extreme  basis 
somewhat  blackish;  the  palpi  of  the  femalq  much  larger,  oidy  at 
the  tip  dusky-whitish,  otherwise  l)lackish.  Antennse  small,  l)iaek, 
with  an  ai)ical  arista.  Front  of  the  male  of  uniform  breadili, 
somewhat  exceeding  the  breadth  of  the  face,  blue  with  yellow- 
brownish  dust,  and  green  and  shining  upon  the  vertex.  The  front 
of  the  fenmle  is  considerably  broader,  more  green  and  less  thickly 
dusted,  the  dust  has  in  the  vicinity  of  the  antenna-  a  whitish 
api)earancc.  Cilia  of  the  upper  orbit  black,  those  of  the  lateral 
and  iiderior  orbits  whitish.  Thorax  distinctly,  but  not  very  thickly, 
dusted.  The  coarser  bristles  on  the  posterior  end  of  the  snuUI 
hypopygium  are  less  striking;  the  very  small  exterior  a})pendag(>s 
are  ln'ownish-black.  s^oxie  black  with  whitish  dust ;  the  fore  coxa; 
indistinctly  dingy  v '..te-yellowish  at  the  tip;  the  sparse  hair  on 
the  front  side  pale,  but  the  bristles  of  the  tip,  black.  The  tro- 
chanter of  the  fore  and  middle  feet  dusky-yellowish,  of  the  hind 
feet  more  brownish.  Femora  black  with  green  lustre;  their  black 
hair  is  comparatively  short;  oidy  on  the  under  side  of  the  femora 
of  the  male,  very  closely  to  the  tip,  a  few  somewhat  longer  bristle- 
like hairs.  The  tips  of  the  four  anterior  femora  and  the  tibiie  are 
brownish-yellow,  but  the  tip  of  the  hind  tibiic  is  rather  dark- 
brown.  The  fore  tarsi  of  the  male  are  slender  and  elongated, 
brownish-yellow  at  the  root,  then  gradually  becoming  more  infus- 
catcd  ;  their  first  joint  is  about  as  long  as  the  two  following  taken 
together;  the  pulvilli  are  but  moderately  enlarged  and  elongated. 
The  middle  tarsi  of  the  male  are  of  the  same  color  as  the  fore 
tarsi  and  of  the  same  structure,  Itut  the  first  joint  is  almost  as 
hmg  as  the  f<dlowing  four  taken  together,  and  the  pulvilli  are  not 
so  much  enlarged  and  less  elongated.  The  fore  and  middle  tarsi 
of  the  fenmle  correspond  in  color  with  those  of  the  male,  are,  how- 
ever, considerably  shorter,  have  no  enlarged  pulvilli,  and  the  first 


;■;■"' 
.J-    ( 


vii 


tl'' 


PIAPIHiRlTS. 


ii;5 


^■■\m 


juint  of  tlic  foro  tarsi  is  about  ('(jiiiil  in  i('iit!;tli  to  nil  tlio  otlior  Jnints 
logi'lliL'i".  The  short,  hind  tarsi  arc  in  Ijoth  sexes  dark  l)lack-lirii\vn. 
Cilia  of  the  wliite-yellowisli  teji'iihi'  Ijlack.  ilalteres  \vliile-ye!l((\v- 
isii.  Winsrs  tin^-ed  with  trray,  with  l)lack-i)rowii  veins,  wliicii  are 
inaririned  with  dusky  in  faded  specimens;  they  are  rather  lar<i'e 
and  broad  ;  their  greatest  breadth  is  dose  Ijefore  the  middle  ;  tlie 
posterior  transverse  vein  lies  in  the  middle  between  the  extreme 
root  and  the  extreme  tip  of  the  wing;  the  fourth  longitudinal 
vein  is  Honu'what distant  from  the  third  one;  the  first  longitmlinal 
vein  is  comparatively  dose  to  the  nnirgin  of  the  wing  and  scarcely 
reaches  <jne-third  of  the  length  of  the  wings. 
JIah.   New  York. 

a.  D.  lailicllatlis,  nov.  sp.  'J,.  —  Aencri-viriili:^,  pe(lil)Us  iiigris, 
tiltiarnni  aiiteri<iruiii  diniidio  basali  llavo,  ciliis  ti'gulaiuiu  nigiis,  ot:ulis 
maris  in  fronte  si'paratis. 

Bronze-green  ;  feet  lilack  ;  1)asal  half  ot"  thf  four  anterior  tibia;  yellow  ; 
cilia  of  the  tegula;  l)lack  ;  the  eyes  of  tlie  male  separated  upon  the  front. 
— Long.  corj).  0.13.     Long,  al.  0.14. 

Dark  metallic-green,  the  ctihir  of  the  scutellum  somotinies  more 
blue  and  that  of  the  alxlomen  more  coppery.  Face  with  thick 
whitish  dust.  Palpi  small,  whitish  and  fringed  with  a  few  black 
hairs.  Anteniue  small,  black  ;  the  arista  subapical.  Kyes  separated  ; 
front  much  mirrower  than  the  face,  broailer  below  than  almve,  and 
covered  with  thick  white  dust.  Cilia  of  the  upper  orliit  l)lack,  of 
the  lateral  and  inferior  orbits  whitish.  Thorax,  though  "Itli  dis- 
tiiu't,  l»ut  very  thin  brownish-yellow  dust.  On  the  jxtstcrior  einl 
of  the  hypopygium  there  are  six  bristles  of  remarkable  strength. 
The  l)r((wnibli-black  exterior  appendages  arc  of  nuu'li  larger  size 
than  in  the  kindred  s])ecics  ;  they  are  elongated  spatule-shaped, 
very  inirrow  at  tlu'  I'oot,  rounded  at  the  tip  and  fringed  with. 
blackish  Iniirs.  C  )Xie  and  feet  black  ;  llie  trochanter  of  the  fore 
coxa',  the  extreme  tip  of  the  four  anterior  fcnmra  and  basal  half 
of  the  four  anterior  tibia;  yellow.  The  hair  upon  the  feet  is  black, 
on  the  under  side  of  the  hiinl  femora  elongated  ami  more  dense 
towards  their  lij).  The  pulvilli  of  the  fore  tarsi  are  rather  un- 
commonly elougate<l,  while  tho.se  of  the  middle  tar;-'  exhibit  oidy 
a  small  elongation  and  those  of  the  hind  tarsi  none  at  all.  Cilia 
of  the  white-yellowish  teguhe  black,  llalteres  white-yellowish. 
Wings  gray  with  brownish-black  veins,  rather  large  and  broad  ; 


"fffffir 


ir.f, 


DIl'TEKA  OF  Nulixn  AMKUIC'A. 


[I'ART  rr. 


tlicy  liave  their  f^roati'st  hrcndtli  soiiiowliat  before  their  inichlje; 
the  posterior  triiii.sver.se  vein  is  iu  tiu;  middle  between  tlie  extreme 
root  iiM(l  the  tip  of  the  win,L''s  ;   the  lirst  louf^itudiiial  vein  runs  al 
least  as  far  as  tiie  tliird  of  tiie  leiiji'th  of  the  wing. 
Hal).   Middle  States.      (Usten-Sacken.) 


mm 


6.  I>.  leilCOStolUUS  LoEW.  %  and  J  . — Laute  viriilis,  thorace  ft 
scuIhHo  intenlum  Cijeruleacontibus,  tegularuiu  cili).s  albidis,  vena  loiigi- 
tuilinali  (luarta  nou  iuterrui)tti. 

Lii-'ht  greeii,  thorax  and  scuti'lhun  sonietinies  more  lilue  ;  cilia  of  tlie 
tegtihe  wliitisli,  tlie  fourth  longitudinal  vein  not  interrupted.  Long, 
eorp.  O.Oit— 0.10.      Long.  al.  0.1 '.2. 

f^v.v.   Diaphurns  liuroslDiiius  LoEw,  Neiie  Beitr.  VIII,  58,  5. 

Mdlr.  Li<;'ht  green,  metallic,  shining,  thorax  and  seutelliim 
sometimes  sky-blue.  Face  for  a  male  very  broad,  deei)ened  length- 
wise, without  transverse  swelling.  s(v  thickly  covered  with  snow- 
white  diist,  that  the  ground-color  becomes  invisii)le.  Palpi 
protruding,  inucli  larger  than  in  the  males  of  other  species; 
l»rolK)scis  very  snndl,  black.  Anlenme  black,  larger  than  in  other 
species;  the  third  joint  is  ])articularly  distinguished  by  its  more 
consideralde  size  and  is  cxtcnde<l  at  tlm  end  iido  a  short  ])oiiit ; 
arista  inserted  on  the  upjier  side  before  the  tip  of  this  point,  hut 
so  much  bent  downwanl  as  to  I)e  easily  ndstaken  for  being  apical. 
Fr(jnl  of  uniform  breadth,  scarcely  exceeding  that  of  the  face. 
I)lue  with  white  dust,  which  is  thicker  near  the  antennte  and  is 
almost  totally  wanting  n\un\  the  vertex.  Cilia  of  the  upper  t)ri)it 
black,  those  of  the  lower  iuid  lateral  orbits  whitish.  Thorax  with 
thin  gray-whitish  dust.  The  bristles  on  the  jtosterior  nuirgin  of 
the  small  hypopygium  rather  long  and  strong;  its  outer  appen- 
dages are  not  distinctly  visible.  Coxio  black,  the  foremost  dusky- 
whitish  at  the  tij),  on  the  front  side  rather  bright  blue-green  and 
fringed  with  whitish  hair,  but  without  black  hairs  or  bristles. 
Femora  metallic  l>luc-green  with  yellowish  tip,  with  very  short 
hair.  Tibiie  ami  tarsi  yellowish,  the  latter  towards  (he  end  gradu- 
ally somewhat  darker,  but  oidy  their  last  joint  brown  ;  fore  til)ia^ 
without  strong  bristles,  middle  and  himl  tibite  with  a  stronger 
bristle  on  the  exterior  cd'fCH  of  their  uj)i)er  side  and  n(»t  far  from 
the  root  ;  the  hind  tibiie,  on  the  c  t>  rswi  edge  of  the  u]»per  side, 
are  sparsely  Ijeset  with  shortei    I'v-l  weake;   );,';!jtles.     Fui ..'  tarsi 


J  • 


DIAPIIURLS. 


ii;t 


loiijf  iuid  slender  ;  their  iirst  joint  about  as  long  as  the  other  throe 
together,  the  pulvilli  (•(iiisiderahiy  enlarged  and  elongated.  Middle 
tiirsi  like  tla,'  fore  tars'  and  of  a  similar  color,  but  their  Iirst  Joint 
about  as  long  as  the  other  four  together,  and  the  j)ulvilli  not 
({uite  so  large  and  not  ([nito  so  elongated  as  t)n  the  fore  tarsi. 
Jlind  tarsi  more  infuseated,  only  the  root  of  the  first  joint  l)ro\vn- 
ish-yellow.  Tegnhe  whitish  with  whitish  cilia.  JIalteres  also 
whitish.  Wing.s  hyaline,  but  very  little  tinged  with  gray;  veins 
i)rown-blaek  ;  the  jtosterior  transverse  vein  rather  e.xactly  in  the 
middle  between  the  root  and  the  tip  of  the  wing;  the  Iirst  longi- 
tudinal vein  reaches  but  very  little  beyond  the  third  part  of  the 
length  of  the  wings. 

Fi'iiKile.  Face  very  little  l)roa(ler  tlnin  in  the  male,  with  thick 
white  powder,  although  apjx'aring  gray  on  account  of  the  appa- 
rent dark  ground-c(»lor ;  it  is  somewhat  deepened  ujiou  its  larger 
up]>er  ])art  and  gently  convex  upon  its  snndler  lower  part  ;  both 
parts  are  divided  by  an  imperfect  transverse  swelling.  J'alpi 
whitish,  near  the  basis  somewhat  gray.  Antenn;e  considerably 
.snndler  than  in  the  male,  the  third  joint  much  snuiUer,  rounded, 
with  an  almost  inii»erceptible  angle  below  the  insertion  of  the 
arista.  Front  inor.'  broad  and  more  green  than  in  the  male. 
Tarsi  shorter  and  usually  somewhat  nn)re  infuseated  than  those  of 
the  male.     The  pulvilli  not  enlarged. 

Huh.   Maryland.      (Osten-Sacken.) 

Oh.-<err(ih'i»i  1. — I  believe  that  I  am  not  mistaken  with  regard 
to  their  belonging  together,  but  I  rather  preferred  to  descrilte 
them  ticparately.  If,  contrary  to  e.\p(>etation,  they  should  prove 
as  not  belonging  together,  then  the  name  must  remain  to  the  male, 
which  I  consider  as  typical. 

OhKcrriifion  2.  —  />.  /c'/ro.sVo/»''.s  a))proaches  in  its  entire  hal)itus 
severjll  species  which  1  believe  must  l)e  referred  \{>  (.'/iri/snliis  uutvr 
than  any  other  species  of  the  genus  J)/(i/t/i<)riif<,  known  to  me.  The 
elongation  into  a  point  of  ihe  third  joint  of  the  antenna'  in  tlie  male 
seems  to  indicate  a  reIatioiishi]»  to  Si/iiarflira.-<  Imrhafus;  neverthe- 
less the  latter  ditl'ers  materially  by  its  n,,' row,  not  deepened  face, 
by  the  cons])icuously  elongated  third  joint  of  the  anteuuie  and 
also  by  the  entirely  apical  insertion  of  the  ari.sla. 


I 


^ 


i(;8 


DIl'TKHA  OF  .NuKTII  AMKKK'A. 


[I'Airr  !i. 


B.  The  List  segment  of  tliu  fourth  loiivjitmlinal  vein  interrupted. 

1'.  D.  illterruptllH  Lokw.  %. — Oliscurt!  viivsccns,  iiiodici!  iiiteiis, 
feuiorihu.s  et  tibiis  coiiuolorihus,  geiiilniij  testatuis,  taisi.s  fusci.s,  vena 
alarum  loiigitudinali  quartfi.  interrupta. 

Dark  preen,  moderately  shining ;  femora  and  tihife  also  preen  ;  knees 
brownish-yellow  ;  tarsi  brown;  the  fourth  longitudinal  vein  interrupted. 
— Long.  corp.  U.2I5.     Long.  al.  0.20. 

SvN.  Diaphtinix  lule.rnijHun  LoEW,  Wien.  Eut.  Monatschr,  V,  37,  i). — Loew, 
Xeue  Beitr.  VIII,  59,  ti. 

Male.  Ratlior  dark  <i:i'(mmi,  not,  very  sliiiiiiijr.  Fiict;  of  uiiiforiii 
Itroadtli  .with  the  front,  very  l)roa(l  for  a  iiiali',  covorod  with  tliiik 
whitisli  dust,  so  that  tiio  ffroiiiid  ('(»lnr  Ijccoiucs  iuvisihh',  mo(h'r- 
atcly  dcopt'iied  and  witliout  a  transverse  swellin;^.  J*alpi  and 
|)rol)oscis  l)hu'k.  Anti'imio  lihick  ;  their  lirst  joint  somewhat  hni.ii'er 
than  in  other  species;  the  third  joint  niunded;  jtositioii  of  the 
arista  distinetly  dorsal.  Front  with  thick  dusky-wiiitish  pow(h'r, 
so  as  to  conceal  the  ffround  color.  Cilia  of  the  uj)|)er  orhit  l)lack  ; 
the  cilia  of  the  lateral  and  inferior  orbits  an;  whitish  and  form  a 
consiiieralde  frinj^e.  Upper  side  of  the  thorax  and  of  the  scntel- 
him  dark-frreen  and  dull  from  grayish  dust.  Ahdomen  more 
shining-green,  with  extensive  but  less  thick  whitish  dust  and  on 
the  anterior  ])art  of  the  segments  copjtery  to  a  large  extent.  Tin,' 
four  stout  bristles  on  the  posterior  end  of  the  small  and  imix'dded 
hypopygium  are  very  prominent.  Coxa^  l)iack  ;  the  fore  and 
middle  coxa?  on  the  front  side  more  bhiek-green  and  fringed  with 
1)lack  bristles.  Femora  metallic  green,  stout,  beset  with  dense 
and  coarse  black  hair,  on  the  under  side  with  numerous,  but  not 
strong  black  bristles.  Knees  yellowish-brown.  Tibia;  on  the 
under  and  front  side  black-l)rown,  on  the  upper  and  hind  side 
dark  metallic-green,  of  strong  structure  and  with  unusually  strong 
bristles.  Tarsi  black-brown,  the  root  of  the  anterior  ones  and 
the  under  side  of  all  the  others  more  brownish-red  ;  all  tarsi  are 
stouter  and  less  elongated  than  in  the  other  sjjccies  known  to  me, 
also  with  more  hair;  the  jtulvilli  arc  all  vei  ■  much  enlarged  and 
elongated.  Teguhe  yellowish  with  i)ale-yellowish  cilia.  Wings 
hyaline,  scarcely  a  little  tinged  with  gray,  alternately  with  yellow 
and  lirown  veins;  first  longitudinal  vein  somewhat  distant  from 
the  margin  of  the  wing  and  reaching  about  as  far  as  the  middle  of 
the  wing;   the  third  longitudinal  vein  is  very  close  to  the  second 


I.YRONElUrS. 


ICO 


and  ends  lonp  before  the  tip  of  tlie  wiiif?,  althoiifjrli  its  end  is  very 
iniieli  eiirved  huekwards ;  tlie  jjosterior  transverse  vein  is  very 
short  and  lies  much  before  the  middle  of  the  wing,  so  that  the  last 
setrnient  of  the;  fonrth  h)nfritiidiind  vein  l)eeoHies  nneoninionly  Ioiilt  ; 
tlic  latter  diver^:es  very  niueh  from  the  third  loiifritudinal  vein,  is 
entirely  interrupted  njton  its  second  third  and  the  last  third,  which 
is  remarkable  by  its  slenderness,  is  i)ushed  forward  towards  the 
ihird  loufritudinal  vein. 

Hah.   Cuba.      (Poey.) 

Ohscrnition. — The  interruption  of  tlie  last  sefrment  of  th(!  fourth 
loMiritudinal  vein  is  ]»artienlarly  strikinjr  in  this  species  ;  a  trace 
of  it  is  also  found  in  some  of  the  European  sjiecies.  The  )>osition 
and  the  course  of  the  third  longitudinal  vein  recall  the  ueuration 
of  Lijruneurus. 

Gen.  XXIX.     I^YRO^fELRCS. 

The  followinp;  are  the  characters  of  the  freiius  Li/rouriiruK  : 
The  body  is  elongated.  Eyes  upon  front  and  face  widely  sepa- 
rated in  l)oth  sexes.  Antenna;  short;  the  first  joint  not  liairy,  the 
second  transverse,  the  third  short,  rounded,  distinctly  ])ubesceiit; 
arista  ajiical.  Wings  very  large,  at  the  tip  l)road  and  very  ob- 
tuse ;  the  posterior  transverse  vein  does  not  ap])roach  the  margin 
of  the  wing ;  the  third  longitudinal  vein  very  close  to  the  s'"ond 
and  very  much  turned  backward  at  the  end;  the  s])ace  between 
the  third  and  fourth  longitudimd  veins  reumrkably  broad;  last 
segment  of  the  fourth  longitudinal  vein  distinctly  in(lecte<l.  Feet 
rather  long,  but  not  very  slender;  first  joint  of  the  hind  tarsi 
without  bristles.  Pulvilli  of  the  fore  tarsi  in  the  male  not  elon- 
gated, llypopygium  small,  imbedded,  at  the  posterior  end  with 
four  strong  bristles  ;  its  apj)en(lages  are  very  small  and  hidden. 

The  genus  LijroneurKx  is  liy  far  the  next  related  to  the  genus 
/)iaj)hori(ti.  A  more  minute  examination  of  the  American  spe- 
cies of  DiophoruH  has  satisfied  me  that  this  rehitioiiship  is 
greater  than  I  supposed,  when  estal)lishing  the  genus  Li/ro- 
ih'io'us  (Wien.  Ent.  Monatsch.  I,  o7).  The  larger  size  of  the 
wings,  which  are  very  broad  at  the  tij*,  the  greater  breadth  of  the 
space  between  the  third  and  fourth  longitudinal  veins,  the  distinct 
flexure  of  the  last  segment  of  the  fonrth  longitudinal  vein  and  the 
not  elongated  pulvilli  of  the  fore  tarsi  in  the  male,  these  are  the 


/• 


.    I 


^■-  'I'  1 


m 


.!,;■ 


no 


DII'TKIIA  OF  NDUTir  AlMKKirA. 


[I'AUT  II. 


i'liiiriiftcrs  wliicli  distiiif^iiisli  Li/rij)ici(ruii  rmin  Jtiapfiont.^.  Tlic 
lust  of  tliese  cliuraclt'i's  is  dccisivo  for  the  inaiiitcnaiico  of  ihc 
genus  Li/nmcunix,  as  tlio  oloiigalioii  of  the  ))ulvilli  of  the  fore 
tarsi  ill  tiie  male  caimot  he  (lis)»eiise(l  with  in  the  character  of  tlic 
jireiiiis  /h'ap/ioriifi,  without  rendering  the  limit  between  Diuphorufi 
imd  r///-v,sf;/(/,s  entirely  uncertain.  • 

'i'lie  genus  Jji/roiirKnix,  to  which  also  belongs  I>.  ndiishit^ 
AVied.,  seems  to  contain  only  American  species;  they  appear  to 
))e  particularly  numerous  in  South  America. 

The  name  of  the  genus  (I'roiii  xv|ia,  the  lyre,  and  itvpov,  the 
nerve)  has  refereiK'e  to  the  lyre-shaped  space  between  the  third 
and  fourth  longitudinal  veins. 


I.V  ■ 


1.  I...  i'lCI'lllesceiiS  Lokw.  ■^  . — Viridis,  thorace  et  alidotiiinis  doiso 
fii'i  ulcis,  IV'iiioruiii  apice  tibiisque  totis  testaceii^,  tar.sis  ex  ni^jro  fuscis. 

(iiei'ii,  tlior.'ix  anil  dorsuin  of  the  abdomen  sky-l)liiH  :  tip  of  tbe  t'ciiiora  and 
tin;  wliolc  tibiie  brownisli-yidlow  ;  tarsi  blauk-biown.  Long.  corp.  (K'l'J,. 
Lon.L'.  al.  0.125. 

Sys.    J.i/roiti  itnis   cirruhsreiis   Loew,  Wien.   Kiit.   Mon.  I,  3i). — LoEW,   Neiie 
B.'itr.  VIII,  (JO,  1. 

Light  metallic-green,  most  of  the  upper  side  of  the  thorax,  of 
tlie  scutelliim  and  the  greater  part  of  the  upper  side  of  the  abdo- 
men sky-blue  or  violet.  Face  of  considerable  and  uniform  Itreadili 
and  so  thickly  covered  with  gray-whitish  dust  that  no  trace  of  the 
l)liie-green  ground-color  is  left.  J'alpi  l)lack,  with  white-grny 
dust  and  with  strong  black  hairs.  Antenniu  black,  short.  Front 
of  uniform  ))readth,  equal  to  that  of  the  face  ;  the  dust  upon  it  is 
so  thick  that  hardly  a  trace  of  the  ground  color  is  left.  Cilia  of 
the  u))per  orbit  black,  cilia  on  the  lateral  and  inferior  orbits  white 
and  forming  a  rather  thick  beard.  Thorax  ])ale  green,  upon  the 
middle  line  and  ujion  the  whole  hind  ])art  sky-l)lue,  or  shifting  to 
violet.  The  rather  thick  dust  on  the  ujjper  side  of  the  thorax  has 
a  gray-brownish  tinge.  Scutellum  blue  or  violet  with  gray-brown 
dnst,  on  each  side  with  a  stronger  and  with  a  weaker  bristle,  tm 
the  surfiice  bare.  JMeura;  green  with  rather  thick  gray-white 
tliist,  Alidomcn  cylindrical,  metallic-green;  its  upper  side 
shining  liliie  or  viidet  from  the  middle  of  the  second  segment  to 
the  lip.  The  jiiiir  upon  (he  abdomen  is  lilack  ;  tiie  bristles  on  the 
lllliil  lunv^hi  uf  tho  single  segments  are  but  of  moderutu  length. 


11.'; 


T  II, 


riiiiysoTUS. 


in 


1  III 

iIm 

Inn 

the 

'/V/,S 

"htft 

•  to 

the 

iril 

'I'lif  lateral  iimrfriii  of  the  altdoiiicii  shows  a  distinct  ^[ray- whitish 
(lust.  The  small  h)'|»oiiygimii  is  coiiiplctcly  iinhcddcd  ;  it  lias  (as 
J  now  iKTccivt'  on  a  wcll-pri'st'rvcd  sju'cinicn)  lour  strong'  hiistlts 
on  the  hind  niar^'in,  like  tlic  liy|m|»y^inin  of  the  nudes  of  />my//(o- 
riis;  the  ajipendaj^es  oC  the  hypoitvfi'inin  an'  e.Mri'niely  small,  and 
completely  hi<lden.  Coxa-  hiack,  somewhat  shiltin<i'  to  fireen,  ren- 
den'd  ^niy  Ity  a  coverinjj^  of  dust ;  the  fore  coxa'  at  the  tip  are  of 
a  dnsky-yellowish  color,  and  beset  with  hiack  hristles,  while  on 
their  front  side  there;  is  some  pale  hair.  Femora  fireen,  ind 
slronj!;  and  frin/,''ed  with  comparatively  short  Itlack  hair.  On  tlic 
four  anterior  femora  the  tij>  to' a  consideralde  extent,  and  <tn  the 
hind  femora  oidy  the  extreme  tip  are  of  a  hmwiiish-yellow  color. 
Tiliia'  bniwidsh-yellow,  the  tip  of  the  hind  tibia'  sln»n<i'ly  inl"ii>- 
eated,  all  the  til»ia'  with  but  few  bristles.  Tarsi  Ithnk-lirowii,  the 
first  joint  of  the  nnddle  tarsi  uji  to  its  first  third,  that  oi'  tlie  Inrc 
tarsi  up  to  the  middle,  yelhuv-bnjwni^h.  Fon'  tarsi  but  little 
lonji'er  than  the  fore  tibia',  and  their  lirsf  jnint  not  (piile  so  hmi:" 
as  the  rest;  their  piilvilli  not  eniarjicd.  'reiiuhe  wliite-yellowish 
with  br<»wnish-l»laek  cilia.  W'in^s  prayish  liyaline  wiili  a  u'reasy 
lustre;  veins  brown  ;  the  first  loiijritudinal  vein  lies  do>e  to  the 
marf^in  of  the  wiii<r  and  reaches  (jiily  a  little  over  the  lir>t  (piarler 
of  the  len^-th  of  the  wiiifrs;  the  costa  is  rather  stout,  particularly 
near  the  end  of  the  second  loiiffitudinal  vein  ;  the  jiosterior  trans- 
verse vein  is  straifrht  and  is  ])retty  much  in  the  middle  between 
the  root  and  the  tip  of  the  wing. 
Ilah.   Mexico. 


• 


Gen.  XXX.     C  IIRTSOTl  S. 

The  prenus  Chi'i/sotiix  ciMitains  on  the  average  only  small  spe- 
cies. 'I'lie  eyes  of  the  males  in  many  species  meet  upon  the  fmnt  ; 
in  males  of  other  s]tecies  they  are  sejiarated.  The  front  beconu  s 
iu'oader  towards  the  vertex  in  most  of  these  specit's,  and  more  so 
than  is  the  case  with  the  species  of  Dio/ihorus.  Antenna'  very 
short;  the  lirst  joint  with()ut  any  hair  ;  the  sei-oiid  tran-verse  ;  the 
third  n)nnded,  often  rather  kidney-shai)ed,  sometimes  pointed  and 
distinctly  hairy  ;  only  in  <me  species,  which,  on  account  of  tlu! 
afi'reement  of  all  the  other  characters,  1  have  located  with  Chnj- 
rotiis,  the  third  j<iint  of  the  antennijo  is  considerably  ionu'er.  almost 
of  the  same  shape  as  in  must  of  the  species  of  Anjijra.     The  two- 


'h 


n2 


DII'TKllA  OP  NORTH  A.MKIUCA. 


flAKT 


■'i 


m 


jointed  iirista  has  nii  npicul  or  a  siihapical  jiositictn.  lly|M(pv;;'niiii 
iinlicdclcd,  distinctly  hairy  ;  its  outer  apiteiidafres  liave  a  liinielli- 
forni  strncturo  and  are  usually  t'onet'aled.  Feet  rather  short  and 
comparatively  stron;r.  The  lirst  joint  of  the  liind  tarsi  witinMit, 
bristles.  Winers  in  eonijiarison  ratluM'  hroad  and  very  rounded  iit 
the  tip;  tho  small  transverse  vein  in  most  of  the  speeies  very  tar 
distant  from  the  marjfiii  of  the  win^r ;  the  last  sefrment  of  the 
fourth  loiiffitudinul  vein  straij,dit,  parallel  or  almost  parallel  to  the 
third  lon<ritudinal  vein. 

1  have  already  e.xpressed  myself  in  detail  (see  Diojihonix) 
about  the  ditlieulty  nttendinj^  the- distinction  of  the  }!;eneru  Uin- 
phovHti  and  (Jhri/Ko/Ks.  1  have  i)ointed  out  that  I  consider  the 
snndler  size,  the  le.ss  slender  form,  the  comparatively  sandier  si/.(' 
(jf  the  \vinj;:s,  the  smaller  leng'th  (tf  the  feet,  the  not  ehtn^ated  pul- 
villi  of  the  fore  tarsi  in  the  nude  and  the  absence  of  stroiij-cr  liris- 
tles  on  the  posterior  end  of  the  hypopyfrium,  as  those  characters, 
which  enaljle  us  to  distinjyuish  the  speeies  of  Chnjuutus  from 
Dlaphorus. 

The  range  of  the  genus  Chrymtim  is  known  to  be  Europe,  Asia, 
Africa,  and  America.  The  name  of  the  genus  (from  ;t'pvtwT05, 
gilded)  has  reference  to  the  gold-green  color  of  many  species. 

Mr.  Say  has  described  three  North  American  species  of  Cliri/' 
soliifi ;  hardly  one  of  the  three  probably  belongs  to  this  genus,  as 
Mr.  Say  seems  to  have  misunderstood  its  characters ;  C/iri/fioltDi 
niihiltifi  may  be  a  MedcUirnx,  (J.  cunctnnart'iis  is  perhai)s  a  />/«- 
phoriis,  and  (J.  abdominalis  is  j)robably  a  (JJinjKotinnis.  In  the 
ne.vt  place  Mr.  ^Slaccpmrt  has  described  a  female  as  Chr[/Koliitt 
ci  rill  if e  morn  ;  if  face  and  front  are  covered  with  white  dust,  as  it 
seems  to  follow  from  his  descrii)tion,  this  character  and  the  color 
of  the  feet  may  perhaps  help  to  recognize  the  species.  Finally, 
Mr.  Walker  has,  in  his  usual  careless  nnmner,  i)ul)lished  a  Chrij- 
Kotus  incertuH,  which  probably  will  remain  incniiis  forever;  as  he 
has  not  even  stated  the  sex  of  the  specimen  described,  his  descrip- 
tion is  of  no  use  whatever. 

I  know,  tlius  far,  twelve  North  American  species  of  Chrysotus, 
of  which  live  are  represented  in  both  sexes,  three  only  in  the  male, 
and  four  in  the  female  sex ;  two  of  the  latter  offer  but  so  little 
l>eculiar  characteristics,  that  I  hesitate  with  their  publication, 
while  the  two  others  are  striking  enough  to  preclude  the  possi- 
bility of  a  mistake. 


CIIHYSOTUS. 


Tnhh  fur  the  tlrtenhiiinlii'K  nf  the  ^^fifrifM. 


it;] 


I  cornutut,  nov. 


{Tliird  joint  of  the  !iiiti'mi,-('  t'l(ini;,iti'(l. 
Tliiril  joint  of  tiu'  untcnna-  nut  ('lungatL'd  at  all, 
)  I'Vniorii  of  iliirk  cojnr. 
t-  Femora  of  i>alt)  color. 
I  (iround-color  of  tin-  palpi  pale. 
i  Oround-color  of  tiie  piilpi  Itlackish. 
(  I'alpi  whito. 

(  I'iilpi  yiOlow,  near  tlif  liuhin  '  lackish. 
^  Cilia  of  the  tegiiliP  black. 
(  Cilia  of  tlio  tegulip  pale. 
(  Kyes  of  tliH  male  separated. 
I  Kyes  of  the  male  contiijiioufl. 

(  l''our  anterior  tihi.i'  of  the  male  and  all  tlie  tihifP  of  the  female  yel 
I  4  obliquua 


2  longimanuB 
'.'•  validuB 


fi  vIvlduB,  nov 


11 


2 

8 

U 

4 

ft 

/.ir. 

I.ir. 
() 

8 

sp. 

7 

Ow. 

I.w. 

Both  the  fore  tihire  of  the  male  and  th.   four  anterior  tihiie  of  the 

female  yellow.  f)  afBnis  l.u\ 

VVintfs  of  the  male  with  thickened  costa.  !) 

Wingrt  of  the  male  without  a  thirkenetl  costa.  1(» 

("ortta  of  the  male  vc  ly  mnch  incrast>ated.  7  coBtalis  /."•. 

(^osta  of  the  male  moderately  incrassated.      8  Bubcostatus,  nov.  sji. 

Smaller  species,  with   about  three  bristles  on  the  upper  side  of  the 

liind  tibice.  i)  discolor  l.w. 

Larger  specie.s,  with  about  live  bristles  on  the  upper  side  of  the  hind 

tibiae.  10  auratua  /.»•. 

Aiitenn.-e  entirely  black.  11  pallipea  /,'/'. 

First  joint  of  the  anteunje  red.  12  p'oticornia,  nov,  .sp. 


'W 

R'fK 

Systeimitirdl  nrrnnrjement  of  the  Species. 

I.  Third  joint  of  the  antennie  elongated. 

1.  cornutus,  nov.  sp. 

II.  Third  joint  of  the  antennaB  not  elongated  at  all. 
A.  Femora  of  a  dark  color. 

A.  Ground-color  of  the  palpi  pale. 

2.  longimanuB  f.w.  3.  validus  Lw. 

B.  Ground-color  of  the  palpi  blackish. 

1.  Cilia  of  the  tegulse  black. 

4.  obliquua  I  tc.  6.  vi vidua,  nov.  ap. 

5.  affinis  Lw. 

2.  Cilia  of  the  tegulw  pale. 


•h 


IMAGE  EVALUATION 
TEST  TARGET  (MT-3) 


^fvf 


^ 


^--/. 
^ 


^ko 


6U 


1.0 


I.I 


1.25 


l^|2B  |2.5 
1^  1^  12.2 
lAO     12.0 


i.8 


U    IIIIII.6 


V] 


<?; 


^ 


#3 


0^ 


-^^ 


%  ^  C  v^    %^ 


/!« 


V    ^ 


w 


f 


o 


7 


Hiotographic 

Sciences 

Corporation 


23  WEST  MAIN  STREET 

WEBSTER,  N.Y.  14580 

(716)  872-4503 


mo 


174 


DIPTEllA  OF  NOKTFI  AMKUICA. 


[I'AKT  II. 


a.  Costca  of  the  male  incrassated. 
7.  coBtalis  Lw.  H.  Bubcostatus,  uov.  sp. 

h.  Costa  of  the  male  not  incrassated. 
!•.  discolor  Aw.  10.  auratus  Aw. 


B.   Femora  of  a  pale  color. 
11.  pallipes  /.w. 


12.  pictioornis,  nov.  sp. 


y^m 


Pi* . , 


-    I;, 


Description  of  the  Specicx, 

I.  Tmiin  JOINT  OF  the  antknn.^.  elongated. 

1.  C.  cornuf US,  nov-  "p.  %. — Obscure  viridia,  paulo  nitens,  tertio 
anteiinaruiu  artit-ulu  eloni^ato,  ocnlis  infra  antennas  contiiruis,  tegulariiiii 
oiliis  fenioribus(jne  nigris,  tibiis  testaceis,  tarsia  auterioribus  imle  ab 
articuli  prinii  apice  posticisque  totis  fuscis. 

Dark  cn'en,  little  shining;  the  last  joint  of  the  antenncne  elongated,  eves 
meeting  below  the  anteniife  ;  cilia  of  the  tegulae  and  femora  hlaik  ; 
tibiie  brownish-yellow ;  the  four  anterior  tarsi  from  the  tip  of  the  fir^t 
joint  and  all  the  hind  tarsi  brown.     Long.  corp.  0.09.     Long.  al.  0,09. 

Dark  frrcon,  inodoratcly  shining.  Anloni.a;  l)la(k,  tlio  third 
joint  uncommonly  elongated  for  a  Chri/mtus,  almost  of  the  sa!tie 
shape  as  in  the  species  of  Arcjijva,  only  somewhat  longer,  with  a 
hlnnt  tip ;  arista  a|)ical.  Front  hlack-green.  Coxa*  and  fenutra 
l)lack,  the  latter  with  brownish-yellow  tip.  TibiiP  hrownish-ycl- 
l(»w,  the  hindmost  black-brown  at  the  tip  Jitid  fringed  on  their 
upper  side  with  a  moderate  numl)er  of  bristles.  The  four  anterior 
tarsi  are  black-brown  from  the  tij>  of  the  first  joint ;  the  hind  tarsi 
are  of  a  black-brown  color.  Cilia  of  the  tegula;  black.  Wings 
ot  the  ustial  structure  i)eculiar  to  the  genus  ChnjsodDi,  hyalint; 
with  a  gray  tinge  ;  the  small  transver.se  vein  is  before  the  middle 
of  the  wing  and  is  short. 

JInb.   Illinois.     (TjC  Baron.) 

Ob.-irrrafion. — This  species  is  distinguished  from  all  other  sjie- 
cies  of  the  genus  Chrifsofus  in  a  striking  manner  by  the  unusual 
elongation  of  the  third  joint  of  th"  antennae,  agrees,  however,  coin- 
])letely  in  all  other  respects.  I  have  hesitated  to  establish  a  new 
genus  upon  it,  as  but  a  single  character  constitutes  its  difference 
from  Chrysotus,  which  character  belongs  proi)al)ly  only  to  the 
mult. 


CHRYSOTl'S. 


1(5 


II,  The  third  joint  of  the  antknn.k  not  elongated  at  all. 

A.  Femora  of  a  dark  color. 

A.  Ground  color  of  the  palpi  pale. 

!!i.  €.'.  longinianiis  Lokw.      -J,  .— Viridis,  nitens,  palpis   albis,  tnrsis 
anterioribus  tenuibus  et  loiigis. 

Green,  shining,  palpi  white,  tlie  four  anterior  tarsi  long  and  slender.    Long. 

corp.  (1.14.     Long.  ai.  0.14. 
Sy.v.    Chri/sotus  lofijliiianiis  LoEW,  Neue  Beitr.  VIII,  (!2,  1. 

Sliiiiiufi^  <rretMi.  Face  of  uiiifonii,  and  for  a  male,  rather  coiisi- 
(Icralde  bri-adth  ;  the  covering  of  while  du.st(h)es  not  entirely  con- 
ceal the  {rreon-l)lue  fj^round  color.  Palpi  wliite,  not  very  hroad, 
but  for  a  male  rather  long.  The  third  joint  of  the  antenna'  not 
large,  rather  kidney-shaped  ;  the  position  of  the  arista  rather  pre- 
cisely apical.  Front  inetaliic-green,  very  little  dusty  and  townrds 
the  verte.v  very  little  enlarged.  Upper  side  of  the  thorax  covered 
only  with  a  thin  brownish-yellow  dust.  Coxie  and  femora  black 
with  a  )>lue-green  metallic  lustre,  which  is  more  distinct  on  the 
femora;  Uie  tij)  of  the  fore  coxie  yellow,  the  tip  of  the  posterior 
coxa;  dusky-brown.  On  tiie  anterior  feet  the  tip  of  the  femora, 
the  tibiiu  and  the  greatest  part  of  the  lirst  joint  of  the  tarsi  are 
yellow  ;  the  remainder  of  the  unusually  slender  and  long  fore  tarsi 
is  dark  brown  ;  the  hind  tibiie  are  yellow,  but  distinctly  iiifuscatcd 
at  the  tip  ;  the  hind  tarsi  are  dark  brown.  The  hair  ui)on  tlio 
feet  is  .short  and  the  bristles  very  scarce.  Cilia  of  the  teguhe 
l)ale.  Wings  distinctly  tinged  with  gray  and  with  rather  black 
veins.  The  posterior  transverse  vein  is  more  distant  from  the 
Y')i)t  of  the  wing  than  in  most  of  the  other  species. 

Hah.  Middle  States. 


.i. 


3.  C<  TaliflllS  LoEW.  9- — Anreo-viridis,  nitens,  palpis  flavis,  basim 
versus  nigricantibus,  pedibus  tlavis,  fenioi'ibus  i)()stiuis  exi'epto  apiue 
nigris,  viridi-mieantibus,  feuioribus  anticis  nigro  lituratis. 

Qolden-green,  sliining,  palpi  yellow,  towards  the  basis  blackish  ;  feet  yel- 
low, hind  femora  with  the  exception  of  the  tip  bliick,  with  cn'iTii.sh  lus- 
tre, the  anterior  femora  strijjed  with  black.  Long.  corp.  0.1. J.  Long. 
aL  0.13. 

SvN.    Chrysotus  »'«//(/««  LoEW,  Neue  Beitr.  VIII,  {j'i,  2. 

Golden-green,  shining.    Face  for  a  female  of  moderate  Itreadtli ; 


*;,';, 


■  ;  'i 


IS    if 


■flfi'i 


176 


DII'TKUA  (»F  NOIITU  AMK.KICA. 


[ 


I'AUT  II. 


its  c'uvcriiig  witli  wliitisli  dust  dt»os  not  cntiri'ly  conccul  tlic  bhic- 
grccii  jrroiui(l-<'t)l«jr ;  tlio  usual  tniusverse  swolliiig  lies,  as  in  ludst 
of  the  otlicr  sju'cies,  usually  nitlier  far  heluw  its  middle;  pulpi  Inr 
a  fcuuile  of  moderate  size,  yellowish  and  blaekish  at  the  root.  'I'l:e 
third  joint  of  the  auteiiiia>  eomjtaratively  not  larj^e,  rather  rounded. 
Front  metnllie-fireen,  with  thin  dnst  and  towards  the  vertex  a  lit- 
tle enlarjred.  I'pjter  side  of  the  thorax  only  wltii  thin,  lirownish- 
yi'llow  dust.  Coxa;  and  hind  fenntra  Idaek  with  metallie-jrnen 
lustre,  which  is  most  <listinetly  seen  on  the  latter.  The  tip  of  the 
ftu'e  eoxie  yellow  ;  fore  feet  yellow  ;  femora  on  the  upj)er  side  with 
n  black  lonjritudinal  siripe,  the  tarsi  infuseated  from  the  tij)  of  the 
first  joint ;  nuddle  feet  entirely  yellow  ;  the  tarsi  infuseated  only 
from  the  tij)  of  the  I'rst  joint  ;  on  the  hind  feet  the  extreme  tip  of 
the  femora,  the  tibiae  and  the  j^reatcr  part  of  the  first  joint  of  the 
tarsi  are  of  a  pale  color.  The  hair  upon  the  feet  is  short  and 
rather  delicate,  the  bristles  only  few,  thoiiffh  the  little  bristles  on 
the  hind  til)iu!  are  rather  loni?.  The  pale  hairs  on  the  eilia  of 
the  teguUe  seem  to  have,  in  some  directions,  a  dark  apjjearance. 
Wiiifrs  only  sli<i^htly  tin;i'ed  with  jrray,  with  dark  l>rown  veins. 
The  posterior  transverse  vein  approaches  but  little  the  root  of 
the  winjr,  and  is  somewhat  farther  from  it  than  in  most  of  the 


>ther 


species. 


JJab.  Middle  States.     (Osten-Sacken.) 

n.  Ground  color  of  the  palpi  blackish. 
1.  Cilia  of  the  tegulse  black. 

4.  C.  obliqiHIS  LoEW.  %  and  $.— Viridia,  nitena,  tegnlarum  ciliis 
nigris,  feiiioiilms  nigris  viiidi-mi<iantibus,  summo  anteriorum  apice 
flavo. 

% .  Oculis  coutiguis,  tertio  anteuuarum  articulo  obliquo,  tibiis  anteriori- 

bns  flavis. 
9  •  Tibiis  ouinibua  flavis. 

f?hining-green  ;  cilia  of  the  tegulse  black  ;  femora  black,  with  green  lustre ; 

the  extreme  tip  of  the  four  anterior  femora  yellow. 
^  .  The  eyes  contiguous  ;  tlie  third  joint  of  the  antennje  obliijue  ;  the  four 

anterior  tibia;  ye' low. 

5.  All  the  tibiae  yellow.     Long.  corp.  0.09—0.10.     Long.  al.  0.09—0.1(1. 
yvN.    Clirysotus  obliijiins  LoEW,  Neue  Keitr.  VIII,  ()3,  3. 

Mnlc.     Eyes  eom])letely  contisrnous  upon  the  face;  the  snndl 
triangular  spot  between  them,  immediately  below  the  antenna;,  is 


■U  : 


r 


CIIHYSOTLS. 


r 


citvorc'd  witli  Iji-o-vn-^rray  dust  ;  the  vitv  small  pal))!  black.  The 
tiiinl  joint  df  tin;  aiit'iiiuu  <'(iiii|»arativ('ly  with  huij^  hair,  ratiicr 
Inrii'f',  <>l)li(jm',  its  upper  margin  iiiiich  iiiDrc  arclu'd  than  tho  lower 
iiiarjriii,  wliieli  is  aliiiust  straijiht ;  the  arista  is  siil)apic"al.     Front 


d   I) 


iiictallK'-jrrci'ii,  without  a  <listiUL't  trace  of  (Just,  and  Deconiinjir 
liruadcr  upwards.  Tliora.v  shining  jirccn,  sonictinu's  rather  gold- 
ui'i-en.  Coxie  and  fei'iora  black  with  nietallic-j^rcen  lustre;  on  the 
I'liur  anterior  feet  tin;  exlreiuo  tip  of  tho  femora,  the  tibise  and 
the  greater  i)art  of  the  lirst  joint  of  the  tarsi  are  yellow,  the  fol- 
lowing part  o.''  the  tarsi  l)lack-l)rowu  ;  tl\e  liind  til»iie  and  hind 
tarsi  are  <lecidedly  of  a  J)rown-I)lack  color.  The  hair  uiton  the 
feet,  though  sonu'what  rough,  is  short,  and  even  on  the  hind  tihia' 
of  very  moderate  length  ;  the  hind  fenutra  have  on  the  under  side 
1)efore  tho  tip  hut  n  few  bristle-like  hairs  ;  the  bristles  on  the  tibiic 
are  very  scarce  ;  the  pulvilli  are  very  small  even  on  tiie  fore  tarsi. 
Cilia  of  the  teguhe  black,  though  some  of  them  exhibit  in  a  re- 
lleetcd  light  a  yellow -brownish  glitter.  "Wings  somewhat  tinged 
with  gray  ;  veins  ))lack  ;  the  posterior  transverse  vein  very  close 
to  the  root  of  tho  wing;  the  last  segUient  of  the  fourth  longitu- 
dinal vein  parjillel  to  the  third  and  ending  a  little  before  the  tip 


o!  the  wmg. 


FcDKiIc.  Face  of  moderate  broadtli  with  grayish-white  dust 
upon  rather  black  ground  ;  the  usual  transverse  swelling  is  far 
below  its  middle.  Palpi  blackish,  the  third  joint  of  the  antenn.e 
snmller  than  that  of  nuiles,  and  its  ob!i(pie  form  less  striking. 
The  brownish-yellow  dust  on  the  upper  side  of  the  thorax  some- 
what more  dense  than  in  males.  The  color  of  the  four  anterior 
feet  like  that  of  the  males  ;  the  hind  tibiie  yellow  with  a  somewhat 
dusky  tip  ;  hind  tarsi  dark  brown,  the  first  joint  is  sometimes  more 
yellowish-brown  near  the  basis.  Wings  like  those  of  the  nude, 
only  the  anal  angle  somewhat  nu)re  protruding. 

JItib.   Xew  York.     (Osten-Saeken.) 

Obiierration. — I  liave  no  ground  for  doubting  that  these  two 
sexes  belong  together,  as  all  those  characters  which  distinguish 
the  nuile  from  the  fenuile  are  within  the  ra:ige  of  the  sexual  dis- 
tinctions peculiar  to  this  genus,  and  the  agreement  of  all  the  other 
characters  is  very  striking. 


12 


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178 


DIPTEUA  OF  NORTH  AMERICA. 


[part  11. 


5.  C  afllnis  Lokw.  'J,  and  9- — ViridiH,  nitens,  tegulamtn  ciliia  iiigris, 
ftiinoribus  nigris  viridi-inicantibus,  sutiiino  anterioium  apiee  ex  llavu 
piceo. 

^.  Oculis  contiguis,  tertio  anteiinarum  articulo  gubobIi(iuo,  tibiis  autiuis 

ex  llavo  piceis. 
9.  Tibiis  auterioribus  ex  llavo  piceia. 

Shilling  green,  cilia  of  the  tegnl.T  black  ;  femora  black  with  green  lustre  ; 

the  extreme  tip  of  the  four  anteri<»r  femora  yellow-brownish. 
%  .  Eyes  contiguous  ;  the  third  joint  of  the  antennas  but  little  oblique  ;  the 

fore  tibiffi  yellow-brownish. 
9.  The  four  anterior  tibia)  yellow-brownisli.      Long.   corp.  0.09 — 0.1(i. 

Long.  al.  0.10. 

Sys.   Chrysotiis  nffinis  LoEW,  Neue  Beitr.  VIII,  64,  4. 

Male.  It  is  so  imu'li  like  tlie  male  of  C.  ohliquus,  that  a  statc- 
niont  of  tlie  dillereiiccs  will  bo  sufricient  for  its  recognition.  Tlic 
third  joint  of  the  antenna?  is  visibly  smaller  and  less  oblicine  ;  the 
hind  femora  have  ujioii  the  second  part  of  their  under  side  a 
greater  number  of  bristle-like  Idaek  hairs ;  finally  the  hair  upon 
the  hind  tibite  is  mnch  longer;  the  feet  are  considerably  darker; 
fore  tibi;«  more  yellowish-brown  than  yellow  and  towards  their 
tips  distinctly  dusky;  middle  tibiic  often  almost  brown-black,  but 
always  with  a  yelh»wish-brown  basis;  middle  tarsi  entirely  blaek- 
brown  ;  fore  tarsi  only  near  the  basis  of  a  pale  brown  color.  I 
have  not  discovered  any  other  dilferences. 

Female.  I  have  only  a  single  female,  which  I  think  belongs 
here.  It  resembles  the  female  of  the  preceding  species  very  much, 
only  the  fore  tiliiie  are  more  of  a  brownish-yellow  color  and  dusky 
towards  the  tip  ;  the  middle  tibite  are  still  darker  than  the  fore 
tibiie  and  the  hind  tibiie  are  like  those  of  the  male,  black.  The 
third  joint  of  the  antennie  is  somewhat  smaller  than  in  the  females 
of  C  obliqnuA. 

Ilah.   Middle  States.     (Osten-Sacken.) 

6.  C.  vividus,  nov.  sp.  %, — Viridis,  nitens,  ciliis  tegularum  nigris, 
feinoribus  nigris  viridi-micantibus,  genibus  tibiisque  flavis,  maris  oculis 
distantibus  et  cost4  alarum  non  incrassatd. 

Green,  shining,  cilia  of  the  teguh-e  black,  femora  black  with  green  lustre, 
knees  and  tibiaj  yellow;  in  the  male,  the  eyes  separated  and  the  costa 
not  thickened.     Long.  corp.  0.09.     Long.  al.  0.09. 

Metallic-green,  bright,  but  on  the  upper  side  of  the  thorax  with 
a  rather  thick  browni.sh-yellow  dust  and  therefore  more  dull.     The 


CIIKYSOTIS. 


no 


eyes  nro  soparnlcd  l»j'  tlic  face,  wliich  is  ('oniparativcly  Itroatl  for  u 
mule;  tlie  lact'  lias  a  ratliiT  distiiirlly  illnt^t•^•s('(l  iiiiddh'  line,  is  of 
ji  inctallic-grc't'ii  t'olur,  l)Ut  opacjuo  dii  acctount  of  llio  cover  of 
whitish  (lust.  I'alpi  black,  tlicir  whitish  iniwdcr  oidy  bocoiiics 
visible  when  seen  in  a  very  obiicjuo  direction.  Antenna-  Mack,  of 
middle  size,  their  tidrd  j(»iiit  is  somewhat  lounger  than  in  most  of 
till'  other  species,  hairy,  and  of  a  somewhat  irreu-niar  form,  because 
that  part,  where  the  arista  is  inserted,  is  soniewhai  produced  in 
the  shape  of  a  lolje.  Front  metallic-green,  dull  on  account  of 
l)rownish-yellow  dust.  Coxa'  and  femora  black,  the  latter  with  a 
frreen  metallic  lustre;  the  second  joint  of  the  fore  coxtc,  the  tips 
of  all  the  femora,  all  the  tibiu(  and  all  the  tarsi  as  far  as  the  tip 
of  the  first  joint,  yellow,  the  end  of  the  feet  brownish-black.  Hairs 
and  l)ristles  upon  the  feet  very  short,  the  liristles  also  very  few  in 
number.  I'ulvilli  of  the  fore  tarsi  rather  small.  Cilia  of  th<^ 
tcfruhe  black.  Wings  somewhat  grayish,  with  a  rather  protruding 
anal  angle;  the  costa  shows  no  thickeiung;  the  last  segment  of 
the  fourth  longitndiiuil  vein  is  scarcely  a  little  inflected,  jtarallel 
with  the  third  and  ends  inunediately  before  the  extreme  tijt  of  the 
wing. 

lldh.  Illinois.     (TiC  IJaron.) 

Ohiicrvalion. — It  is  not  necessary,  wlion  identifying  this  species, 
to  pay  too  much  attention  to  the  shape  of  the  third  joint  of  the 
anteiMue,  as  it  sometimes  changes  its  form,  especially  when  recently 
develojted  s})ecimens  dry  up.  The  seiiarated  eyes,  the  black  cilia 
of  the  tegula?,  the  color  of  the  feet,  and  the  costa  without  a  thick- 
ening, are  characters  which  prevent  its  being  confounded  with  any 
other  species  known  to  nic. 

2.  Cilia  of  the  tegiilre  pale. 
a.  Costa  of  the  male  thickened. 

T.  C.  costalis  LoEW.  %  and  9- — Viridis,  poUine  confertissinio  px 
fusco  liiii'ifo  opacus,  fenioribus  nigris,  genihus  tihiisiiut;  flavis,  maris 
ofulis  distaiitilms  et  media  costa?  parte  valde  incras.sata. 

Green,  ojiaque  on  account  of  a  very  thick  brownish-gray  dust ;  femora  black  ; 
knees  and  tibinB  yellow  ;  the  eyes  not  contiguous  in  the  male  and  tiie 
middle  of  the  costa  thickened.    Long.  corp.  ('.(it) — 0.10.    Long.  al.  d.ni*. 

Svx.   Chrysotiis  rostnlis  Loinv,  Neue  Heitr.  VIII,  t)4,  f). 

Male.  Ground-color  metallic-green,  or  blue-green,  but  so 
thickly  covered  with  brown-gray  dust  a.s  to  conceal  this  color. 


■4 


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.Mir" 
■l '»  •  I.  •. 


180 


DIPTKRA  OF  NORTH  AMKIltCA. 


[I'AKT  n. 


ruee  broad  for  a  iniilo,  though  a  little  luirrowor  downwanl ;  tlie 
(lust  is  of  aljout  the  sauio  eoloi*  as  the  rest  of  the  hotly,  usuallv, 
liowever,  souiewhat  i>aler.  I'alpi  hiaek,  of  uiithlle  size.  The 
tiiinl  joint  of  the  uiiteuuiu  suuill,  kiiluey-shapetl,  with  an  eiitinlv 
apieal  arista.  Front  (juite  opaijue  on  aeeount  of  its  thick  dust. 
Ti»e  nietidlie-green  ground-color  of  the  upper  side  of  the  tlidrux 
l)econu>H  iuore  visil)le  only  when  seen  from  behind.  {Sculelliiui  and 
abdomen  less  thickly  covered  with  dust  than  the  thorax,  so  that 
their  metallic  gnnuid-color  becomes  more  apparent  in  most  direc- 
tions. The  hair  ujion  the  aljdomen  apjiears,  in  a  reflected  light, 
of  a  pale-browidsh  color.  Co.xa;  and  femora  black,  without  a  <lis- 
tinct  green  lustre,  the  second  j(»int  of  the  fore  coxie,  the  .extreme 
tip  of  all  femora,  all  the  tibitu  and  all  the  tarsi  as  far  as  the  tip  of 
the  lirst  joint,  yellow  ;  the  end  of  the  tarsi  dark  brown.  The  hair 
and  bristles  upon  the  feet  very  short  everywhere,  the  bristles  also 
very  scarce ;  the  pulvilli  of  the  fore  tarsi  rather  small.  Cilia  of 
the  teguke  pale.  Wings  somewhat  grayish,  with  a  rather  protrud- 
ing anal  angle  and  of  more  uniform  breadth  than  in  most  of  the 
other  species ;  the  fore  margin  of  the  wings  shows  a  strong  black 
thickening,  which  commences  abruptly  at  the  end  of  the  lirst  lon- 
gitudinal vein,  becomes  then  gradually  thinner  and  disappears 
already  before  the  end  of  the  second  longitudinal  vein  ;  the  last 
segment  of  the  fourth  longitudinal  vein  is  not  inflected  at  ail, 
]>arallel  with  the  third  and  ends  rather  exactly  in  the  extreme  ti\» 
of  the  wing ;  the  posterior  transverse  vein  is  almost  at  an  ecpial 
distance  from  the  extreme  root  and  from  the  tip  of  the  wing. 

Hab.   Florida. 

Female.  It  resembles  the  male  very  much,  only  the  dust  upon 
tlie  whole  body  is  more  thick  and  the  green  ground-color  of  the 
abdonu'ii  less  bright.  The  face  is  not  very  broad  for  a  female ; 
its  covering  of  thick  dust  has  the  same  color  as  that  on  the  rest 
of  the  body  ;  although  the  usual  transverse  swelling  lies  somewhat 
below  the  middle  of  the  face,  it  is  considerably  higher  than  in  the 
females  of  all  the  other  species  known  to  me,  so  that  the  face  is 
divided  by  it  into  two  almost  equal  parts.  The  wings  have  the 
same  shape  of  equal  breadth  as  in  the  male,  show  however  no  trace 
of  a  thickening  on  the  fore  margin. 

Hab.  Maryland.     (Osten-Sackeu.) 


\i 


\  ix^ 


CIUIYSOTIS. 


isl 


i 


M.  I".  silbcoslatllH,  nov.  sj).  ^  . — Viridis,  iH)lliiio  raro  ex  fiisco  <miu'- 
ii'L  ;is|M'i>iis,  fciiioribus  nii^ris,  viricli-mifantilius,  g(Miil>iH  tiliiisiiiio 
tlavis,  iiiiiiis  ociilid  (listjintibuii  et  iiUMli4  {larte  l'osI.i)  iiiodiuu  iiicrii.sisiitd. 

(Jri'i'ii,  sparstjly  imivckmI  with  bniwuisli-gray  dust  ;  Iciiiora  })la(:k,  with 
gri'nii  liistrt! ;  kiicis  and  tii)ia'  ycllnw  ;  the  I'/fS  in  the  male  sf|iaralcd, 
and  the  c^>^stu  niodciattdy  thickened.    Long.  corp.  O.Oi).    Long.  al.  O.dl*. 

Mi'lallif-;^n'('ii  t»r  hluc-^Tci'n,  iiintn  tlie  tlutnix  willi  in»l  vt'i-y 
tliick  l»r<i\viiisli-<fi'iiy  dust  iiml  lliciTlorn  Irss  sliinin;^'.  Fair  lor  a 
malt'  ratlicr  lirnnd,  towards  llio  Ijottom  soiuL'vvliat  narrower,  with 
viTv  tliick  Itrowiiisli-jiTay  dust.  J'alpi  near  tin;  root  and  niarjiin 
blackisii,  npon  the  middle  more  brownish  ;  it  was  not  itossilile  to 
(listinfTuish  their  ctdor  with  certainly  in  the  descrilied  sjiecimens. 
Third  joint  of  the  antenise  very  snnill  ;  arista  apical;  front  (|nite 
o]»a(iiie  on  account  of  a  covering  of  brownish-jrray  dust.  The 
seulellum  and  especially  the  alubiinen  liave  very  little  dust  and 
are  shiidn<^.  The  hair  upon  the  al)dt»men  is  black.  Co.va-  and 
feiaora  black,  the  hitler  with  a  very  l»ri<rht  frreen  metallic  lustre; 
the  second  joint  of  the  fore  coxa',  the  tip  of  all  femora,  the  tiitiju 
and  all  the  tarsi  as  far  as  the  end  of  the  lirst  j(»int,  yellow  ;  the 
tip  of  the  tarsi  dark  brown.  The  hairs  and  liristles  iJi»on  the  feet 
everywhere  very  short,  the  bristles  at  the  same  tinu'  very  scarce. 
I'ul villi  of  tiie  fore  tarsi  rather  snndl.  Cilia  of  the  tefruia-  whitish. 
Winjrs  jrrayish  with  a  rattier  protruding  anal  anjile  ;  the  anterior 
nnirjrin  of  the  wings  shows  a  not  very  strong,  but  distinctly  visible 
thickening,  which  l)egins  abruptly  ut  the  einl  of  the  first  longitu- 
dinal vein  and  thenco  gradually  <lecreases  towards  the  tip  !>f  the 
wing;  the  last  segment  of  the  fourth  longitudinal  vein  is  scarcely 
a  little  inflected,  parallel  with  tlie  third,  and  ends  a  little  before 
the  extreme  tip  of  the  wing;  ))osterior  transverse  vein  rather 
etpiidistant  from  the  root  and  the  tip  of  the  wing. 

Hdb.   Illinois.     (Le  Baron.) 

Ohtiervation. — C.  i^iihcostnfus  is  easily  distinguislied  from  tJic 
male  of  G.  c(»i(alis  by  the  smaller  antenna',  the  less  thickened 
cos*a,  the  thinner  cover  of  dust,  and  the  green  nu'tallic  lustre  of 
the  femora;  from  all  other  species  it  is  distinguished  by  the 
thickening  of  the  costa. 


.■^  ■  ^1 


■  '1^^  ! 


t 


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i 


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r.  4 

M 


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I 


llii?^ 


llii'C: 


182 


ItllTKIlA  <»F  NdUTM  AMKIIHA. 


/>.  CoMtn  of  thn  iiiiilu  not  t]iick<Mit!il. 


[I'AIIT  II. 


!>.  <".  diHC'Oloi'  I.oKw.  %  ami  9. — Viiiilis,  uitfiis,  fcniorilms  ((iin  olnri- 
Ixis,  i;tMiil)US,  tibiiit  vuiiiH4ii«!  iiliiium  thiviM,  iiiuris  oi.ulis  tlistiuitiluis  vi 
nliiloiiiiiie  viuliiuoo. 

Shilling  urtM-ii,  also  tin*  femora;  knet's,  tibiii- ami  veins  of  tlie  winus  v.l- 
low;  eyes  of  tlu)  niiile  Ht'i>iiraU'il  and  itrt  alidonu-n  violut.  Long.  t(iii>. 
(t.Oi)-(t.l(t.     Long.  aL  O.lO— (Ml. 

Syn.    Chri/siilu.i  ilisiolor  Lokw,  Neno  Ht'itr.  VIII,  (if),  (i. 

Mtilr.  Sliiiiiiij^  jrrocii.  The  face  rallicr  broiid  for  ii  iiialc.  11 
lit! It'  iiarntwcr  tttwanls  the  Inttttnii,  witli  ycllow-ffrayisli  or  lailn  r 
wliito-jrrayisli  dust  upon  grccii  p,-n)Uii(l.  i'alpi  rallicr  siiiall.  Mack. 
The  third  jitint  of  tlic  aiitcmiii;  not  very  hirjuc  with  an  apical  uri>la. 
Front  with  rather  tliick  Itrownish-ycilow  (hi>t  upon  {irccii  jirnund. 
The  upper  i<ido  of  the  thorax  and  the  .sculclhiin  l'ri<ihl  <rol(hii- 
tjreeii,  the  posteritir  end  of  tiie  former  and  tlie  hitter  sonietinics 
more  hhie-green.  The  bro\viiisli-yeIh)\v  (hisl  011  tin'  upper  side  of 
the  tlujrax  is  distinct,  hut  not  sullicient  to  conceal  the  ground- 
color. The  upper  side  of  the  al)domen  is  bright  viidct,  the  lta>is 
of  th(!  first  segment  and  tlie  lateral  iimrgin  stecl-ltliic  or  l)lue-grccii. 
(,'oxa^  hlaek-grecn.  Femora  dark  metallic-g-recn.  The  tip  of  all 
the  fenn»ra  and  the  tibia)  yellow;  the  four  anterior  tarsi  bccnme 
dusky  from  the  basis  so  gradually  that  it  is  dillicult  to  state  where 
the  infiiscation  begins;  on  the  hind  tarsi  the  yellow  coloring  ex- 
tends much  farther,  so  that  only  the  last  joints  exhibit  a  distinet 
dusky  tinge.  The  imlvilli  are  rather  large,  esjiecially  on  the  fore 
tarsi.  The  hairs  and  bristles  upon  the  feet  are  everywhere  very 
short,  on  the  tibiie  and  tarsi  yellowish,  with  the  exception  of  the 
stronger  bristles  at  tlie  tip  of  the  middle  tiltiic.  The  cilia  of  llu; 
tegruhe  are  pale.  "Wings  hyaline,  scarcely  a  little  tinged  with 
grray,  with  lutcous  veins,  which  ))ecome  a  little  nuiredark  towaiils 
the  tip  of  the  wing;  the  last  segment  of  the  fourth  longitudinal 
vein  is  parallel  to  the  tiiird  and  ends  exactly  at  the  tij)  of  the 
wing;  the  posterior  transverse  vein  lies  rather  exactly  in  the  mitl- 
dle  between  tlio  extreme  root  and  the  tip  of  the  wing;  the  anal 
angle  of  the  wings  is  rather  ])rotruding. 

Fcmah'..  It  dilfers  from  the  male  by  the  following  nmrks  :  The 
face  broader,  but  not  too  nmch  for  a  female  ;  the  usual  transverse 
swelling  is  far  below  its  middle.  The  third  joint  of  the  antennaj 
somewhat  smaller  than  that  of  the  male.     The  abdomen  goltlen- 


V.' 


\il 


CIlUY.snTIS. 


Is;{ 


The  pulvilli  of  ali 


friTcii,  williont  imy  trine  of  u  vinlit  colnriiifr. 
IIh'  liirsi  niM!  very  siiiall. 

Jlah.    Middle  States.     (Oslcii-Sackcii.) 


lO.  ('.  aiirallls  Lnmv.  9  • — Viridin,  thorncit  et  noutellonurntiH,  pollina 
lutfsoMiti!  suli(>]);u'is,  ffiiioniiii  iilt;i(>i'iiiii  i\\wy'.  tibilHijuu  uuinibuit  tluvis, 
fat'iu  liitiu.sculii  alliiilo-iiolliiiosa,  j)itliiis  iiigris. 

CirctMi,  thninx  niid  scutulluni  gildetl,  Hiiiiifwliat  dull  on  acruunt  uf  a  liitfous 
(lust;  thu  tip  of  tlif  black  t'ciiiuru  uiid  all  tliu  tibiiu  ^ullow  ;  thu  rather 
broal  faoo  cuvurud  with  whito  dust;  paliii  black.  Long.  corp.  U.ll. 
Long.  id.  (I.  II. 

Svs.    Cliry-otiis  niiriilns  Lop.w,  Neuo  Ht-itr.  VIII,  (if),  7. 

Mc'taHic-jfrci'ii.  Face  even  fur  a  female  ratlier  broad,  with 
{rray-white  dust  ;  the  usual  transverse  swelliuf;  lies  very  far  lielow 
its  middle.  I'aljii  Idaek.  The  third  Joint  of  the  uidennte  rather 
largo  for  a  feunile.  with  eomparatively  lonj:;  hair.  Front  pildeii- 
ffreen,  rather  dull  on  aeeouut  of  a  yellowish  dust,  (»nly  a  lilth; 
Itroader  upwards.  The  ujiperside  of  the  thorax  ffreenish-jridtlen, 
lint  thiekly  covered  with  yellow  dust  and  tliereiure  opaijue.  Cnlur 
and  dust  of  the  sciitcllum  the  same  as  those  of  the  tln»ra.\.  Alido- 
men  of  a  purer  mtdallic-j^reeii  and  with  less  dust,  near  the  Itasis 
Jisually  more  golden-green.  Coxiu  hlack,  the  extreme  tip  of  the 
first  joint  and  the  second  joint  of  the  fore  eoxiu  yellow,  the  second 
joint  of  the  hind  coxio  yellowish-hrown.  Fcnnira  black  with  in- 
distinct green  or  bronze-colored  metallic  lustre;  the  tip  of  the 
four  anterior  femora  is  to  a  larger,  and  that  of  the  himl  femora  to 
a  snniller  extent,  yellovv.  The  tibiju  and  the  tarsi  have  the  same 
c(dor,  but  the  latter,  towards  their  end,  gradually  l)ecome  dusky. 
The  hair  ujjon  the  feet  is  everywhere  very  short,  and  the  bristles 
very  scarce.  Cilia  of  the  teguhe  pale.  Wings  soimnvhat  grayish 
with  brown  veins  ,  the  posterior  transverse  vein  lies  about  midway 
between  the  extreme  root  and  the  tij)  of  the  wing. 

IJab.  New  York.     (Osten-Sacken.) 

B.  Femora  of  a  pale  color. 

11.  r.  pallipps  LoKW.     I  and  9.— Viiidis,  nitens,  coxis  auticis  pe- 

dil)UsqHe  flavis. 
Shining  green,  the  fore  coxJC  and  the  feet  yellow.     Long.  corp.  0.09—0.10. 

Lonp.  al.  0.10—0.11. 
Byx.    Chrynotua  paUipcs  LoEW,  Neue  Beitr.  VIII,  G6,  8. 


4 


1  \ 

■    f 

t'] 


l>it 


lill'TMt  \  OK  Niiinil  AMKIMCA. 


[I'AIIT  II. 


llfitli  scvcs  ri'>;riiililt'  ciK'li  ((IIht  very  iiiiirh.  M('tiillic->fn'cii. 
sliiiiiiijr.  TIk'  fyes  uf  llic  nialc  mccl  aliunst  (•(iiniilctcly,  so  that 
tlir  lai-c  appfars  sniall,  liiifar ;  in  tlic  It'iiiulc  it  is  lu'oailcr  ami  has 
tlic  usual  traiisvcrso  swt'lliii};'  far  l»t'h>\v  its  niiddh'.  'riic  dust  upon 
it  is  white  in  both  sexes.  Tlie  palpi  are  rat  her  small  and  eovered 
with  whitish  dust  so  as  to  t'oneeui  tlie  ffroiind-ecdor,  whieh  appears 
to  ite  iiioi'i!  Yellowish  than  hiaekish.  The  third  joint  of  the  an- 
tenini'  is  not  lai'fjre,  (>veii  in  the  males,  and  liut  litth;  ohliipu'.  Front 
green,  rather  dull  IVoiu  whitish  dust.  The  upper  side  of  the;  thora.v 
has  a  tlistinet  whitish  dust,  whieh  however  does  iKtt  <'oiieeul  the 
;rroiind-c<dor.  The  lilaek  liuir  upon  thu  ulidomeii  is  Homewhut 
huift'er  than  in  most  of  the  other  species.  The  whol.'  fore  eo.\a', 
the  tip  of  the  middle  and  hind  coxa'  and  tlu!  whole  feet  an!  yel- 
low, even  the  tarsi  are  only  sli^^htly  dusky  towards  the  tip.  Cilia 
of  the  teji'uhe  pale.  Winjrs  a  little  (grayish,  with  lirownish  or 
brown  veins  ;  the  posterior  transverse  vein  lies  considorubly  nearer 
to  the  root  than  to  the  tip  of  the  winj?. 

Jlab.   Middle  States.      (Osteii-Saeken.) 


i-^^h^^:,v 


It.  r.  ItiriiieoriiiH.  nov.  sp.  %. — Minutus,  viridi-aeneus,  modice 
iiitfiis,  ocalis  int'r.'i  iinteuiias  coiitiguis,  ])rimo  autunuarum  articulo  rufo, 
coxis  iinticLs  i>(;>iil)as(iU(i  lliivi.s. 

Small,  bronze-green,  nindeiately  liright ;  tlio  eyes  contiguous  below  the  an- 
teniijc ;  lir.st  joint  of  the  iinteniiio  red;  foro  coxie  ami  the  feet  yellow. 
Long.  corp.  U.08.     Long.  al.  0.08. 

Very  small,  bronzc-prccn,  moderately  shininp.  The  eyes  con- 
tifruous  helow  the  nntennu'.  Tin;  antennie  small,  the  first  joint 
red,  the  following  two  black,  the  third  rather  small  and  a  little 
oblicjue  ;  arista  apical.  Fore  eoxa;  and  feet  somewhat  brownish- 
yellow.  The  tij)  of  the  hind  femora  on  the  upper  side  and  all  the 
tarsi  from  the  tip  of  the  first  joint,  brown.  The  hind  tibiju  arc 
fringed  (»n  the  upper  side  only  with  a  few  delicate,  not  very  con- 
spicuous bristles,  and  show  a  dusky  tinge  at  the  tip.  The  color 
of  the  cilia  of  the  teguhe  I  cannot  ](ositively  state.  Wings  of  the 
usual  structure,  grayish-hyaline  with  brownish-black  veins ;  the 
posterior  transverse  vein  is  rather  short  and  lies  before  the  middle 
of  the  surface  of  the  wings. 

Jiab.   Illinois.     (Le  Baron.) 

Observation. — This  description  is  made  only  after  a  single  spe- 


11 


\.d- 


TKtTIIol'ltiiUrS-   SYMI'YCXrH. 


Is-i 


ciincii,  iuhI  will  pniltalily  r)M|iiii'r  smiic  curiTrliun  ;  tin- cnldr  nf  the 
tii'st  J'>iiit  of  tilt'  iiiili'tiiiic  is  so  fliiiniclci'isiir  I'ur  ilii>t  >|ii'('ioH,  that 
tlu'iT  is  at)  ])r*)l)al)ility  of  its  luMii^i^  iiiistakrii  l\>v  aiiotluT. 

Oen.  XXXI.     TF.I  C  IIOPIIOKl  M. 

The  fjcims  Titiihuithitrii!<  rciiiaiiis  liitlicrlo  niii(iii»'<l  to  liiit  a 
few  I'liinijiiMiii  species.  'I'liey  raliier  resemlile  tlie  small  species  it'i 
Chr  If  filth  1.1,  iMit  are  easily  (lisliiijruislieil  rnmi  tiieiii  by  llie  rulluw- 
iiijf  cliaracters  :  Aiiteiina'  smaller;  arista  tlistiie-lly  dorsal.  'I'lif 
ul)(|omeii  of  the  male  somewhat  compresseil  laterally,  '{'he  pos- 
terior traiisversi^  vein,  which  is  far  distant  from  the  mar^iin  of  the 
winj;,  has  an  e.vtremely  steep  position,  so  that  its  posterior  end  is 
farther  from  the  root  of  the  wiiij;  than  its  anterior  end.  The 
feel  of  the  nude  are  frinired  with  isolated,  stronjr,  slitf  bristles,  and 
its  hind  tiliia>  are  cnrved  and  adorned  in  various  manners.  ISesides, 
in  all  the  hitherto  known  species,  the  costa  of  the  male  is  thickened 
in  the  same  manner  us  that  of  the  previously  deserilx'd  ('.  ii).i/iilis. 
The  other  churucters  of  the  genus  coincide  with  those  of  C/iri/- 

SdluS. 

The  name  of  the  penus  (from  ffixoi,  armor,  and  ^t\'u,  I  hear) 
has  proliably  reference  to  the  peculiar  orj^ans  with  which  the 
nude  is  provided. 


Oen.  XXXII.     SYMPYCXl'S. 

Charnrfvrs.  Small,  In;*  little  shii\infr  species,  of  a  rather  slender 
shape.  The  face  is  not  narrower  upwards.  Antenna'  rather 
small,  in  the  fennde  shorter  than  in  the  male ;  the  first  joint  with- 
out hairs;  the  arista  is  inserted  upon  the  edjre  of  the  third  joint 
in  the  vicinity  of  its  basis.  The  metathora.v  is  not  unusually  pro- 
trudiiiLC  nor  (doii,L'ate(l.  The  altdonien  of  the  nuile  is  more  or  less 
compressed  laterally.  The  hypopy^ium  is  snnill,  more  or  less  im- 
bedded ;  its  outer  ap}»en(la<res  small,  sometimes  not  distinctly  visi- 
ble. The  fourth  longitudinal  vein,  towards  its  e!id,  is  perceptibly, 
althoujrh  oidy  slijrhtly,  appnt.ximated  to  the  third  and  very  little 
oonverfrent  towards  it  ;  it  ends  somewhat  before  or  into  the  tip  of 
the  wing;  the  ])osterior  transverse  vein  before  or  upon  the  middle 
of  the  winjr,  distant  from  its  margin  ;  the  si.xth  longitudimd  vein 
becomes  indistinct  long  before  it  reaches  the  margin  of  the  wing. 


m 


^, 


t'  -  ■  i-v; 

■I' 


1  sc, 


IHPTKRA  OF  NORTH  AMKIlIfA. 


[I'AItT  IT. 


The  feet  are  sparely  friiijjod  with  l)ristl('s ;  the  hind  tarsi  shorter 
than  tlie  liind  til)ia>  and  tiieir  lirst  joint  without  1)ristles. 

Tlie  jrenns  Si/nij)i/riins  stands  in  the  (dosest  proximity  to  Anc})- 
siux,  is,  however,  very  easily  distin,i,Miishe(l  from  it  ))y  the  ffhibrons- 
iiess  of  tJK!  lirst  joint  of  the;  anteinue.  Amoii};  the  {i'enera  whieh 
liavc  no  iiair  upon  tlie  lirst  joint  of  the  antennae,  Xdiilliixlihinitt, 
'TcuclitijiJiiirus  and  (Jdiiijisiciiciniis  are  the  next  to  it;  they  dilVer 
from  Si/iiij)>/cn IIS  ])y  ilm  following  elniracters  :  1.  XdntJioclilnrus 
liy  the  depression  on  the  ](osterior  end  of  the  thorax  and  the  pre- 
vailing' yellow  color  of  tlie  body  and  of  the  bristles  upon  the 
thorax;  '?.  TciivJiDiiliorKH  liy  the  steeper  positit)n  of  the  posterior 
transverse  vein,  the  thiekenin<^  of  the  eosta  in  the  male,  the  isolated 
and  strikinji'ly  strong  bristles  ui)oii  the  feet  and  the  entirely  hidden 
liypopyjj:iuiii  ;  .'J.  CantiixicuoiiKu  by  the  elon<rate(l  metathorax,  liy 
the  last  sej-ineiit  of  the  fourth  lonf^itudinal  vein,  which  is  i)arallel 
to  the  third  ami  ends  always  biyoiid  the  lip  of  the  wiiiiis  and 
by  the  face  of  the  male,  whieh  is  very  narrowed  u])war(ls,  t^e. 

The  name  of  the  genus  (from  ovitnvxvo^,  crowded  together)  has 
reference  to  the  crowding  together  of  the  ends  of  the  fourth  and 
the  third  longitudinal  veins,  whereby  Si/dijii/ouis  is  distinguished 
from  ('((mjisirncniua  and  many  other  related  genera. 

I  am  only  accpiainted  with  species  from  Europe,  Africa  and 
North  America;  the  majt)rity  of  tlie  North  American  species 
difl'er  from  the  European  and  from  the  South  African  species  by 
tlu!  fourth  longitudinal  vein  ending  exactly  into  the  tip  of  the 
wing,  while  in  the  other  species,  this  end  is  distinctly  before  the 
tip.  As  they  agree  in  all  other  details  of  organization,  there  is 
no  ground  for  a  generic  separation,  but  it  would  be  advisable  to 
form  of  <hem  a  group  within  the  genus  Si/mpi/nius.  The  charac- 
ter of  <!ie  genus  Si/nipijcnuii,  as  hitherto  established,  requires,  with 
regard  to  these  species,  a  slight  modification,  wliicli  1  have  already 
introduced. 

Table  for  the  determination  of  the  S/xcics. 
Fourth  longitudinal  vein  ending  before  the  tip  of  tli(!  wine; 


f  i'ounn 
'  Fourtli 


1  tertianuB,  nov.  sp. 


'ourtli  longitudinal  vein  ending  into  the  tip  itself. 
AnteniiiB  entirely  black. 

!P  pale  near  tbe  basis. 
Tlinrax  with  dark  loimitudiiial  lines 


(  Antenn 
'  (  .\iitenn 


3i 

t  Thorax  without  dark  longitudinal  lines. 


2  frontalis  f.w. 

.*?  lineatus  /.«'. 
4  nodatua  Lw. 


I'M      ,, 


^'L 


SYMPYCNUS. 

Sy>>tematic(il  urrnnijemvnt  of  the  Species. 
I.  The  fourth  longitudinal  vein  ending  before  the  tip  of  the  wing. 

1.  tertianus,  n.  sp. 

II,  The  fourth  longitudinal  vein  ending  into  the  tip  itself. 

2.  frontalis  f.w. 


18T 


4.  nodatUB  Lw. 


b.  lineatus  Liv. 


Dcscrljilion  of  the  Sjiecie.-i, 

I.  The  fourth  lonuitldinal  vkin  knuinu  befoue  the  tip  of 

THE  AVINU. 

1.  S.  tl'I'tiailUS,  iiov.  sp.  %  and  9- — ^''^  cinereo  viresceus,  suh- 
opacus,  thorace  non  liiicato,  duolnis  i)riuiis  antennaruni  artiuuiis,  jial- 
pirf,  ventre,  coxis  iiedilju.sque  dilutissiuie  ilaviuantibus,  tarsis  inde  ab 
artieuli  prinii  apice  nigri(;antibus. 

1 .  Articulo  tarsorum  postiuoruni  tertio  abbreviato  et  prope  apicem  pilis 
paulo  longioribus  liirto. 

9.   I'edibus  siniplieibus. 

Gray-greenish,  ratlier  dull ;  thorax  without  dark  lines  ;  the  first  two  joints 
of  the  antennie,  palpi,  venter,  coxic  and  feet  pale-yellowish  ;  the  tarsi 
from  the  tip  of  tht;  first  joint  blackish. 

^  .  The  third  joint  of  the  hind  tarsi  shortened  and  rough  on  account  of 
some  longer  hairs  near  the  tip. 

9.  Feet  pliiin.     Long.  corp.  0.10.     Long.  al.  0.1(». 

Dark  frniyish-f^rccH,  1  ithor  dull.  The  front  seems  to  I)e  of  tlie 
same  color.  Face  fjrayish.  J'alpi  and  the  lirst  two  joints  of  the 
antenna'  wliite-yellowisli ;  tlie  third  joint  blackish,  in  Iiotli  sexes 
rather  rounded.  Arista  in  both  sexes  plain.  A'enter  whitish-yel- 
low as  far  as  its  tip.  The  liyp<>py<i:ium,  as  in  the  other  species  of 
this  f^(.iius,  rounded  and  semi-ind>edded  ;  its  lancet-shaped  e.vterior 
lamelho  small,  but  distinctly  percejitiljle  and  of  rather  dark  color. 
The  posterior  maru'in  of  the  j)leuric  and  the  coxa'  wliite-\ell(»wish  ; 
the  four  posterior  coxa;  near  the  Iiasis  more  or  less  i'lfuscated. 
Feet  wlnte-yellowish,  with  Idack,  somewhat  scattered  hairs,  on  the 
middle  and  the  hind  til)ia>  with  a  few  black  bristles.  The  tarsi 
from  the  tip  of  the  first  joint  very  much  infuscate(|,  the  hind  tarsi 
from  the  same  spot  almost  entirely  black.  'I'he  joints  of  the  fore 
tarsi  of  decreasin<r  leiifrth  in  the  fennile,  while  in  the  male  the 
third  and  fourth  joints  are  of  about  the  same  lenfrth.  The  joints 
of  the  middle  tarsi  are  of  dccreasiri<>;  Icnj^'th  in  both  sexes.  The 
first  joint  of  the  hind  tarsi  is,  in  both  sexes,  a  little  shorter  than 


i! 


\m.' 


m 

WM\  . 

1'' 

'^K^^.  .      ^ 

Hv 

K 

"ill 

B:     ' 

•H'.  ■ 

»*      ■ 

S»".  f 

■          ■ 

fm 


■     ;llll 


m 


1  -  :■■(  .;'«i 
, '-;  .  icr,  ..1 


188 


PTPTERA  OP  NORTH  AMERICA. 


[part  ir. 


tlie  second;  tlio  rullowiiig  joints  niv,  in  the  female,  of  deereiisinj^ 
lenji'tli  ;  in  the  mule  the  third  joint  is  sumewhat  shorter  than  the 
fourth,  and  at  its  end,  on  the  posterior  side,  l)eset  with  lonjrer 
blaek  hairs.  Wings  towards  the  basis  very  much  narrowed  ;  the 
posterior  transverse  vein  is  before  the  middle  of  the  disk  of  the 
wing,  Ijut  rather  exactly  in  the  middle  between  the  extreme  root 
and  the  tip  of  the  wing;  the  fourth  longitudinal  vein  ends  some- 
what before  the  extreme  tip  of  the  w;Mg;  in  the  female,  however, 
at  a  very  small  distance  from  it. 
JIab.  Sitka.     (8alilberg.) 

II.  The  fouutii  lonuitudixal  vein  ending  into  the  tip  of 

THE  AVINO. 

S*  S.  frontalis  Loew.      %    and    5*. — ^'ig^icalls,  fronte  lajte  violaceo 
splendente,  auteiinis  totis  nigris. 

Blackish  ;    the  front  bright  violet ;    the  antenna!  entirely  black.     Long. 
Corp.  0.11.     Long.  al.  0.12— U.13. 

Syn.  Sijmpi/cnuH  frontalis  Loew,  Neue  Beitr.  VIII,  G7,  1. 

Face  in  the  fcnuile  of  moderate  breadth,  in  the  male  below  very 
narrow,  towards  the  antenna?  broader,  with  white  dust,  so  that 
the  blue  ground-color  becomes  very  little  visible.  Antenme 
black,  larger  than  in  the  next  following  species ;  the  first  joint 
rather  long  ;  the  third  joint  only  with  a  very  short  pubescence, 
larger  and  ovate  in  the  male,  smaller  and  rather  rounded  in  the 
female.  Front  bright  steel-blue  or  violet.  Cilia  of  the  inferior 
orbit  whitish.  Upper  side  of  the  thorax  dull  on  account  of  a  thick 
gray-brownish  dust,  nevertheless  the  green  or  blue  ground-color 
is  distinctly  visible  through  the  dust.  The  scutellum  is  of  the 
same  color  as  the  upper  side  of  the  thorax,  and  has  no  hairs 
besides  the  usual  bristles.  Abdomer  b'ack  or  greenish-black, 
the  second  segment  usually  with  a  comi)lete  or  almost  comi)lete 
yellowish  transparent  transverse  band,  the  third  segment  with 
one,  which  is  interrupted  in  the  middle  ;  moreover  the  first  and 
fourth  segments  arc  usually  yellowish-transparent  on  the  lateral 
margin.  The  venter  is  always  white-yellowish.  The  hypopygium, 
of  the  s  iue  color  as  the  abdomen,  is  somewhat  larger  than  in  the 
other  species  of  this  genus  known  to  me,  and  but  very  little  im- 
bedded ;  its  outer  appendages  are  so  small  and  hidden  that  I  can- 
not distinctly  porceive  their  shape.     The  posterior  margin  of  the 


IJiL 


SYMPVCNUS. 


189 


plcuroj,  all  the  coxre  and  the  feet  yolluwisli.  Fore  coxik  only  with 
j»ale  hairs.  The  foiiiura  Iiavo,  besides  the  usual  small  bristles  im- 
mediately before  the  tip,  no  other  bristles.  The  fore  tibiie  are 
without  bristles,  the  middle  and  hind  tibia;  with  but  few  In-istles. 
The  fore  tarsi  are  more  or  less  infuscated  towards  their  tip ;  in 
the  female  the  joints  are  of  decreasing  length,  the  first  nearly  as 
long  as  the  three  following  together  ;  in  tiie  male,  on  the  contrary, 
the  first  joint  is  extremely  shortened  and  not  (piite  as  long  as  the 
last  one,  the  second  almost  as  long  as  the  two  following  together, 
the  third  considerably  slujrter  than  the  fourth  joint,  which  latter 
is  fringed  on  its  upper  side  with  little  curved  hairs.  The  joints 
of  the  middle  tarsi,  which  towards  their  end  become  more  and 
more  dusky,  are  of  decreasing  length  in  the  fenmle  ;  in  the  male 
their  first  joint  is  considerably  longer  than  the  following  four 
joints  together,  the  second  as  long  as  the  following  three  together, 
the  third  and  fourth  of  almost  e(|ual  length,  but  very  short,  on  the 
anterior  side  bearded  with  delicate  little  fringe-like  hairs;  the 
fifth  joint  is  somewhat  more  slender  than  the  two  preceding  joints 
and  almost  as  long  as  these  taken  together.  The  hind  tarsi,  from 
the  tip  of  the  first  joint,  are  more  or  less  infuscated,  the  first  joint 
much  shorter  than  the  second,  and  the  following  joints  of  decreas- 
ing length  in  both  sexes.  The  teguhe  with  pale-yellowish  cilia. 
Wings  rather  long  and  narrow,  but  moderately  pointed  towards 
the  root,  in  the  fenmle  less  tinged  with  gray  than  in  the  male  ;  the 
fourth  longitudiiml  vein  is  parallel  with  ii."e  third  and  ends  rather 
exactly  into  the  tip  of  the  wing;  the  posterior  transverse  vein  is 
perpendicular  and  lies  before  the  middle  of  the  wing. 
Hah.  Pennsylvania.     (Osten-Sacken.) 


3.  S.  lineatlis  Loew.  %  and  9  ■ — Cinerens,  fronte  nigrd,  antennarnm 
basi,  sciitt'Ui  margine,  ventre  pedibusque  Uavis. 

Gray,  front  black  ;  the  root  of  the  antenna*,  the  marpin  of  the  scutellnm, 
the  venter  and  the  feet  yellow.  Long.  corp.  0.10 — 0.11.  Long.  al. 
0.11—0.12. 

Syn.  Sym/iyrniis  Uneatua  Loew,  Neue  Boitr.  VIII,  67,  2. 

Brownish-cinereous,  opacpie.  Face  c '••■•  -i  with  whitish  dust 
upon  black  ground ;  in  the  female  it  is  rather  narrow,  in  the  male 
so  much  narrowed  that  the  eyes  are  contiguous  on  the  lower  part 
of  the  face.     Palpi  rather  blackish.     AntenniB  rather  short,  the 


1^ 

! 

;  ( 

1  * 

t.  ■ 

1 

-  ,i  ,' 

I 

n 

m\ 

■^n 


:C"-:n^ 


,  ■i.flv'ii.:* 


i1  ■ 

'    -'■.** 

^:\i- 

■  'i  ■ 

'.    "i  ^ '■' 

l')0 


DIl'TKUA  (IF  NCtUTir  A^IKUICA. 


[I'AliT  ]I. 


third  joint  smaller  than  in  the  next  proced •;■.;:  specios,  in  tho  \\\\ 
chmtr'atcd-ovatc,  in  llio  female  eonsiderahlv  shorter,  in  both  sex 


xes 


with  a  hasal  arista;  the  lirst  joint  is  always  of  a  yellowish  eolur, 
the  two  followinir  ])aler  or  darker  brown,  sometimes  rather  black- 
ish. Front  blaek.  Cilia  of  the  inferior  orbit  pale.  Upper  side 
of  the  thorax  brownish-cinereous,  entirely  uj)a(iue  ;  the  humeral 
eorner  usually  brownish-yellow  ;  on  its  upper  side  there  are  several 
dark  Ioii<ritudinal  lines,  the  more  distinct  of  which  are  usually  a 
delicate  middle  line  and  two  stroiij^er  lines  alontrside  of  it ;  the 


latter  bear  the  middle  rows  of  bristle 


Tl 


lese  lines 


disa 


ppcar, 


however,  when  looked  upon  from  another  direction,  and  are  not 
eipially  distinct  aid  sharply  dclined  in  all  specimens.  Scutellum 
on  the  middle  of  the  ujiper  side  g-ray  with  a  metallie-blue  lustre, 


the  nmririn  velhtw.     JMeune  irrav,  their  inferior 


portion  more 


u'llow.  The  metathorax  bliickisli-,ti*ray.  Abdomen  in  well 
colored  specimens  brownish-a-ray,  in  less  matured  ones  more  yel- 
lowish-lirown  ;  the  whole  venter  always  pale-yellowish.  The  small 
hypopyuium  is  mostly  shiidn<r  lilack  and  rather  ind)edde(l;  the 
outer  appendaii'cs  are  lartrer  than  usual  in  the  species  of  this  jrenus 
and  have  alm(»st  the  form  of  small  liliform  lamellae;  their  color  is 
a  diniry  ycllowisli-l»rown.  Coxie  asid  feet  yellowish.  Femora 
<udy  with  tho  usiial  bristles  immediately  before  the  tij).  Fore 
tibia'  without  bristles.  Middle  and  hind  tibise  with  a  moderate 
iiund»er  of  short  bhick  bristles.  The  first  joint  of  the  fore  tarsi 
about  as  lontr;  as  the  three;  followiufr,  which  are  of  decrea  insr 
length,  most  of  the  fourth  and  the  whole  fifth  joint  black-brown, 
^liddle  tarsi  from  the  tip  of  the  first  joint  more  or  less  dusky; 
their  first  joint  al)out  as  lontr  as  the  four  followinir  to^-ether,  which 
are  of  decreasiiiir  IcuLi-th.  The  lirst  joint  of  the  hind  tarsi  much 
shorter  than  the  second,  the  followinir  of  decreasing  leng'th. 
Tejruhu  with  brown  margin  and  with  ))ale-yelli)wish  cilia.  AVintrs 
tinged  with  gray,  in  the  nmie  with  a  cuneiform  tapering  towards 
the  basis;  this  is  not  the  case  in  the  females;  the  fourth  longitu- 
dinal vein  is  parallel  with  the  third  and  ends  rather  exactly  into 
the  tip  of  the  wing;  the  posterior  transverse  vein  is  perpendicular 
and  lies  rather  ui)on  the  middle  of  the  wing  in  the  female,  consi- 
derably beyond  it  in  the  male. 

Ilab.  Virginia;  New  York.     (Osten-Sacken.) 


\}l: 


SYMPYCM'S. 


Ill 


4.  S.  nodatlis  LoF.w.  %  ami  9* — fincn-us,  ni.artriiit'  jiriini  nntcnna- 
mm  .irtictuli  infero,  fascia,  .■vlnlojiiinis  baxali  iiiafiilit^i|iiH  lat«'raliliiis.  ven- 
tre et  pedibus  llavi('antil)us,  fenioriiiu  posticoruin  apice  nigrt',  (*t.'tik  aii- 
teiiiiali  maris  capituluiu  miiiutuiu  apicalu  gfieiite. 

Gray,  the  lowt^r  margin  of  the  first  joint  of  the  aiitcniKT,  a  hand  near  the 
basis  of  the  abilonien,  hiteral. spots  ujion  it,  venttM'  ami  feet,  yellowish  ; 
the  tip  of  the  liind  femora  blackened  ;  the  arista  of  the  male  at  tlie  tip 
with  a  small  button.     Long.  corp.  (Md— n.ll.     Long.  al.  d.ll— (i.l2. 

Syn.   Syiii]»/ciius  iiodatits  LoEw,  Berl.  Ent.  Zeitsch.  VI,  -1'),  G>. 

Face  of  tlu!  iiialo  vitv  nnrrow,  upwards  a  little  broader,  with 
white  (lust  ;  tiie  faee  of  the  feuiale  much  l)roa<h'r,  i..»t  i»ereej>tili!y 
narrowed  Itelow,  jiiul  much  less  thickly  (histed,  so  that  the  i'lack 
frround-e(dor  is  distinctly  apparent.  Antenuic  of  a  stouter  struc- 
ture, and  even  a  little  larjrer  than  in  S.  /'roiitalis  ;  the  first  joint 
rather  lon<r,  u)»oii  «''<.  under  side  always  of  a  yellowish  color,  souie- 
tinies  yellow,  with  the  only  exception  of  its  upper  edtre,  in  which 
case  the  yellow  coloring  extends  also  on  the  lower  cdjr(,'  of  the 
second  joint;  the  third  joint  in  the  male  is  broad  ovate,  in  the 
female  rounded.  Arista  Iiasal,  in  the  fennde  somewhat  shorter 
and  plain,  in  the  male  lon<fcr  and  eidarji'cd  at  the  lip  into  a  small 
button.  The  front  is  fi'ray,  but  appears  in  some  directions  almost 
black.  l'])])er  side  of  the  thorax  brownish-jrray,  opaipie.  without 
distinct  lonu-itudinal  lines,  with  black  l)ristles.  Scutelhim  usually 
darker  than  the  upper  side  of  the  th(»rax  and  without  luiirs,  excejit 
the  usual  bristles.  Pleura;  whitish  shite-u'ray,  their  posterior 
mar<rin  yellowish.  Abdomen  of  a  brtuize-black,  moderately 
bright  culoring,  sometimes  with  a  green  or  bbie  metallic  lustre; 
ui)on  the  second  segment  there  is  a  very  broad,  usually  inter- 
rupted, transverse  band;  ui)on  the  third  segm<'iit  there  is  also  a 
transverse  band,  usually  interrupted  in  the  middle,  and  consisting 
of  two  yellow  lateral  spots;  the  fourth  segment  has  usually  a  yel- 
low spot  on  each  side.  The  hypopygium,  being  of  the  same  color 
as  the  abdomen,  is  of  a  similar  structure  as  in  ,S.  J'r<)nlah'!< ;  its 
snnill,  not  easily  jten.'eptible,  appendages  are  black.  Coxa'  and 
feet  yellowish.  The  fore  coxa'  are  covered  only  with  whitish  hair, 
nevertheless  the  stronger  hairs  on  the  tip  assume  sometimes  a 
blackish  appearance.  The  femora  without  any  other  l)ristles  but 
those  small  ones,  usually  found  before  the  tip  ;  the  hind  femora  are 
of  a  brownish-black  color  to  a  rather  large  extentj  though  their 
extreme  tip  i.s  again  paler.     The  fore  tibiie  have  only  a  single 


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192 


rtll'TKIlA  (IF  NdKTII  AMKIUCA. 


[I'AHT  H. 


gniall  bristle,  ^vlli(•ll  is  on  tlicir  upjicr  side,  not  far  from  tlie  root  ; 
tlic  iniddli!  tibiii;  have;  only  a  few  bristles  ;  llio  liind  tibiiu  have  a 
larprer  nniuber  of  l>ristles,  but  they  arc  mostly  very  sht;rt ;  in  the 
male  there  is  oik;  bristle  on  the  nnder  side,  not  far  from  the  l)asis, 
\vhieh  is  rennirkaltle  for  its  lenj^th.  Tiie  fore  tarsi  have  l';the 
lenji'th  of  the  tibia';  in  the  nnile  the  lirst  joint  is  very  iiineh 
shortened  and  not  as  lon<!j  as  the  list  one,  the  seeond  is  as  lonjr  as 
the  three  followinjr  toti-ether,  and  usually  a  little  l)laekened  on  the 
cxtretiie  tij),  the  three  last  ones  are  l)laek  and  very  little  decreasinfr 
in  leiiji'th  ;  the  last  one  with  somewhat  shorter  hairs  than  the  two 
jjreecdinu- ;  in  the  fenuile  the  fore  tarsi  are  frradually  of  a  darker 
blaek-brownish  eolor  towards  the  tij),  and  their  j<jints  are  (jf  a  de- 
creasinsr  leiiuMh,  the  first  somewhat  lonj^er  than  th  •  two  followin^^ 
))ut  not  (|uite  so  long  as  the  threj  f<jllowing'  tofrether.  The  mid- 
dle tarsi  of  the  nnile  but  little  exeeed  the  tibiiu  in  lenjrtli ;  their 
lirst  joint  is  of  a  plain  structure,  but  almost  1  i  the  length  of  the 
other  joints  and  blaekened  at  its  til) ;  th.'  last  four  joints  arc  l)laek  ; 
the  seeond  is  as  long  as  the  last  three  together,  gradually  enlarge<l 
towards  its  end,  and  at  the  end  o:i  the  outside,  in  consecpienee  of 
the  greater  length  of  the  appressed  black  ind)eseenee,  elongated 
into  a  kind  of  j)rojection  ;  the  third  and  fourth  joints  hav»  on  the 
))osteiior  side  a  few  erect  crooked  hairs.  The  middle  tarsi  of  the 
female  are  jdain,  scarcely  shorter  than  those  of  the  male,  towards 
the  tip  gradually  of  a  darker  black-brown  color ;  their  joints  are  of 
a  decreasing  length,  the  first  is  longer  than  the  following  two,  but 
shorter  than  the  following  three  together.  'I'he  hind  tarsi  are  of 
the  same  structure  in  Ijoth  sexes,  shorter  than  the  tibi*  ;  their  last 
four  joints  black  ;  the  first  joint  is  scarcely  longer  than  the  third, 
tl>e  second  at  least  as  long  as  the  third  and  fourth  together,  llal- 
teres  yellowish.  Teguhe  with  a  narrow  black  margin  ;  their  cilia 
appear  yellowish  in  a  reflected  light,  seen  towards  the  light,  however, 
blackish,  in  the  female  even  often  Idack.  Wings  grayish  hyaline, 
in  the  male  with  the  posterior  margin  somewhat  wavy,  and  towards 
the  basis  much  more  pointed  than  in  the  female ;  the  fourth  longi- 
tudinal vein  is  parallel  to  the  third  and  ends  precisely  at  the  tip 
of  the  wing ;  the  posterior  transverse  vein  is  perpendicular  and 
lies  upon  the  middle  of  the  wing. 
JIab.  Illinois.     (Le  Barou.) 


liii'-,-/ 


CAMP.sic  :r,:.iu8. 


m 


Gen.  XXXIII.     CAIVIPSICWCMrS. 

Chai-arters.  The  first  joint  of  the  antennae  without  hairs  on  tlic 
upper  side ;  the  third  more  or  less  pointed,  distinetly  hairy  ;  the 
arista  inserted  on  its  l)aek,  near  the  basis.  Faee  npwaros  very 
narrow,  especially  in  the  male.  The  metatliorax  is  flonjrated  ; 
tlie  abdomen  flattened.  Tlie  snmll  hypopyginm  inibi'ddod  ;  its 
appenilaj^es  extremely  small.  Feet  slender;  the  first  joint  of  the 
hind  tarsi  witlutut  bristles.  The  males  are  usually  remarkai)le  by 
the  peculiar  structure  of  their  tibiie  and  often  also  of  the  tarsi. 
The  last  se<rment  of  the  fourth  long-itudinal  vein,  al)out  its  first 
qimrter,  runs  over  a  distinct  convexity  of  the  win<r,  is  parallel  to 
the  third  longitudiiml  vein  and  ends  beyond  the  tip  of  the  winfr. 

The  jrenus  Ca))tp.sici)('))u(.<  possesses  so  many  remarkal)le  cha- 
racters that  the  species  belonging  to  it  cannot  either  be  mistaken 
or  confounded  with  s))ecies  of  another  genus.  The  name  <if  the 
genus  (from  xd^^tj,  the  curve,  and  xir^utj,  the  til)ia)  was  given  be- 
cause the  males  of  many  species  are  distinguished  by  the  peculiar 
curvature  of  their  middle  tibia). 

The  sjjeeies  hitherto  known  belong  to  Europe  and  Xorth  Ame- 
rica. 


Di'fcrijition  of  the  SjiecieK, 

1.  C  llirtiipes  Loew,  %  and  9- — 01)scure  olivaccus,  facie  ochracefl, 
alls  infuscatis,  coxis  anticis  ptuUbusque  ex  testaceo  lufis,  tarsis  praeter 
basiiii  ex  fiisco  nigiis. 

% .  Prinio  tibiaruni  intermediarum  d.imidio  incrassato,  tarsis(iue  anticis 
setas  longiores  gerentibus. 

9.  PedibiLs  siinplieibus. 

Dark  olive-brown,  face  o(dire-colored  ;  winas  Mackisli-pray  ;  fore  cox.t  and 
feet  brownisli-red  ;  tarsi  lilaek-brown  with  tlie  exception  of  the  root. 

%  .  The  thickened  basal  half  of  the  middle  tibice  and  the  fore  tarsi  beset 
with  lont;  bristles. 

9-  Feet  plain.     Long.  corp.  O.dS.     Long.  al.  0.13. 

SvN.    Citiiijisicnemus  hirlijies  LoEW,  Neue  Bcitr.  VIII,  68,  1. 

Metallic   olive-brown.      Face    very   narrow,    yellowish-l)rown, 

with  a  l)right  golden-green  spot  immediately  under  Ihe  antenuic, 

which  is  not  always  easily  discernible.     A'.itenuic  entirely  black  ; 

their  third  joint  in  the  male  long  and  pointed,  in  the  female  short 

13 


-1       "Vi     .! 


f ', '. 


104 


DirTEIl.V  OF  NullTII  AMKHICA. 


[iWUT  II. 


and  Rmall.  Front  liluck  with  a  violet,  ofton  very  hrij^ht  luslrc, 
ininiL'diati'Iy  above  the  anteiiiue  wllli  a  pale  eop|»er-re(Ulish  spot. 
The  fiiia  on  the  inferior  orbit  pale.  Tlie  upper  side  of  the  thora.K 
often  sliowrf  violet  relieetions.  The  scntelluni  shining  violet, 
rarely  shining  blaek  with  an  indislinet  violet  lustre.  The  eohir 
of  the  nlulonien  is  usually  more  greeiiish-blaek.  P'ore  coxa;  brown- 
ish-yellow, near  the  basis  blackened  ;  middle  and  hind  coxuj  black 
witli  l)rownish-yellow  tip.  Feet  yell(»wis!i-red  or  brownish-red. 
The  extreme  tip  of  the  knees  blackish-brown  and  the  tarsi  from 
the  tij)  of  the  first  joint  black.  Sometimes  the  upper  side  of  the 
femora  is  distinctly  infuscated.  Cilia  of  the  teguhc  l)lack.  Wings 
tinged  with  blackish-gray  and  with  l)lack  veins;  the  convexity  of 
the  wings  lies  before  the  first  quarter  of  the  last  segment  of  the 
fourth  longitudinal  vein. 

Male.  Its  fore  femora  arc  thickened  as  far  as  tlioir  middle,  iind 
<m  the  under  side,  precisely  at  the  end  of  this  thickening,  they  me 
densely  bearded  with  stiff  little  bristles ;  the  fore  til)itP  are  visibly 
stouter  than  in  the  female,  beset  on  the  under  side  with  numerous 
and  erect,  on  tlie  upper  side  with  less  numerous  and  less  erec  t 
bristles;  fore  tarsi  with  unusually  long  hairs,  especially  on  their 
first  two  joints.  The  structure  of  the  middle  femora  is  similar  to 
that  of  the  fore  femora,  though  their  thickening  is  less  strong  and 
reaches  as  far  as  the  tip  ;  the  thick  beard  on  the  under  side,  formed 
of  short  stiflF  bristles,  is  thus  brought  nearer  to  their  end.  Tiie 
middle  tibiae  are  of  rather  irregular  structure ;  from  the  basis  to 
about  their  middle  they  are  distinctly  thickened  and  fringed  on  the 
upper  side  with  a  few  long  black  bristles,  on  the  under  side  they 
are  ])r(»vided  with  a  small  tubercle,  beset  with  short  bristles.  That 
part  of  the  middle  tibia),  which  is  not  thickened,  is  of  a  plain  stnie- 
ture,  thougli  beset  on  tlie  under  side  with  a  row  of  rather  long, 
black,  bristle-like  hairs.  The  middle  tarsi  and  the  whole  hind 
feet  are  of  a  plain  structure. 

Hab.  Pennsylvania.     (Osten-Sacken.) 

S.  C  Claildicans,  nov,  sp.  %  and  9. — OHvaceus,  facie  ochrafea, 
alis  infuscatis,  punctuni  nigrum  in  ultimo  venje  (juartm  pegmento  geren- 
tibus,  coxis  anticis  ex  tfst'iceo  fuacis,  pndiltus  ex  rufo  testaceis. 

%.  Tibiis  intermediis  cra.ssissimis,  varia,  supra  nigro-spiiinlosia,  tarsis  in- 
termediis  totis  nigris,  articulo  primo  rra.«so,  recurvo,  .supra  nigro-setoso, 
tarsis  anticis  po.sticia(iue  simplicibua,  inde  ab  articuli  primi  apice  nigris. 

9  .  Pedibus  simplicibua,  tarsis  omnilms  inde  ab  articuli  primi  apice  nigri». 


\  d. 


CAMrsirNF.Mrs. 


1115 


Olire-ijrcHii ;  <lt(>  face  oclirc-^cllow ;  wiiiiis  iiifiiscafcd.  with  n  Mack  sjiot 
tipiiii  tlie  liiHt  Hfgiiieiit  of  tli»  fuurtli  l()iii;itii)liii:il  win  ;  (nm  cuxw  ic<l- 
(lish-lirown  ;  fwt  hrowiiish-rt'd. 

^.  Middle  tiliiiu  very  .stout,  crcxiked,  cm  the  upper  side  with  -innll  Mai  k 
spines;  the  middle  tiir.si  entirely  black;  their  (Irst  joint  thickciuMl, 
curved  upwards,  on  the  upper  hide  with  black  bristles  ;  fore  ami  bind 
tarsi  plain,  from  the  tip  of  the  first  joint  black. 

9.  All  the  feet  plain;  all  the  tarsi  from  the  tip  of  the  first  joint,  black. 
Long.  corp.  0.09.     Long.  al.  0.14. 

Olive-groon  ;  tliorax  iiiDro  bripn  tlian  tlio  nhdnnicn,  near  its 
fore  margin  witli  a  few  strikingly  groon  rcllcctions.  Front  lilnck- 
isli-!)lue.  Anteniiic  etitirol}'  liiack  ;  the  third  joint  small  and  not 
pointed.  Face  brownish  ochre-yollow.  Palpi  ot'liro-lirowiiisli. 
I'roboscis  black.  Cilia  t»f  the  posterior  orbit  l»la<'k  hIiovc.  below 
pale.  Fore  coxte  brownish-red,  sometimes  yellowish-red,  with  a 
white  rellection  near  the  root  and  a  large  part  of  the  outside 
brown;  the  four  posterior  coxae  grayish-black,  the  trochanters 
brownish-black.  Feet  yellowish-red  ;  the  knees,  esjx'cinlly  thosi; 
of  the  hind  feet,  more  or  less  infiiscated  ;  all  the  femora,  the  fore 
and  hind  tibia;,  as  also  the  fore  and  hind  tarsi  are  i)lain  in  botli 
sexes,  the  latter  blackened  from  the  tip  of  the  first  joint.  TIk; 
middle  tibiaj  and  middle  tarsi  are  only  in  the  female  of  the  stime 
plain  structure  and  of  the  same  color,  while  they  are  distinguished 
in  the  male  by  a  very  different  structure ;  for  its  middle  tibise  are 
uncommonly  stout  and  somewhat  curved;  the  greatest  thickness  is 
in  their  middle ;  the  last  two  thirds  of  the  posterior  side  are  excised 
and  provided  with  a  brown  stripe  ;  before  this  excision,  iilmost  on 
the  upper  side  of  the  tibia,  there  is  a  longitudinal  row  of  black  spine- 
like  bristles,  wliich  does  not  occupy,  however,  the  basal  third  and 
the  apical  one-fourth  of  the  tibia;  the  second  half  of  the  tibia 
bears  upon  the  other  two  si<les  a  few  long  black  bristles ;  the 
middle  tarsi  of  the  male  are  entirely  black ;  their  lirst  joint  is 
somewhat  curved  upwards  at  the  tip,  stout  and  near  the  extreme 
basis  a  little  more  swollen,  on  the  upper  side  excised  fnrrow-like 
and  fringed  with  a  row  of  black  bristles  ;  the  following  joints  ar«; 
plain,  the  second  not  quite  so  long  as  the  third,  -nd  at  the  extreme 
basis  sometimes  of  a  yellowish-brown  «olor.  Wings  with  a  dis- 
tinct smoky  black  tinge  and  with  a  small  blackish  spot  upon  the 
last  segment  of  the  fourth  longitudinal  vein. 

Hab.  Sitka.     (Sahlberg.) 


■    t 


■hil 


I 


\': 


I9t; 


IHrTKIlA  OV  NORTH  AMKIUCA. 


Gen.  XXXIV.     l*I.AlilOXi:ritl'N. 


[I'ART  H 


This  j^onns  lins  Ir'cii  I'sttiljlislicil  Jty  iiic  (in  tlic  Wicii.  Kiifnm. 
Moiiatsclir.  I,  4.'])  on  the  spofies  (U'scrilu'd  liolow,  uiul  known  ;i>i 
yt't  (»nly  in  (he  rcinule  sox,  l)Ut  the  extnionlinarv  mi'l  |K'<'ul!:ir  tlui- 
rncters  of  wiiich  rendered  the  cstal)lishnient  <-t'  u  new  genus  neees- 
sury.  The  whole  hiihitns  nj)i>roaehes  tlie  species  of  G'/innojifi-r- 
vijn  and  I'cliniloiu'Krtai  most,  dilVers,  however,  fnnii  both  liy  tl'e 
lirst  joint  of  the  antenme  heinj?  entiivly  without  iiairs  and  liy  tiie 
posterior  transverse  vein  havinj;  ^n  iinusnally  ol»li(pie  position  ; 
from  (ri/iini(>j)ffrin(n  it  dill'ers  ni  treover  l»y  tiie  course  of  the  la>t 
sojfinent  of  tiie  fourth  lon<ritU(l'nal  vein,  wliich  is  almost  iii<e  tliat 
of  the  genus  PehiMi>tH'iir>i,'\  The  peculiarities  (if  the  fcnnile 
seem  to  indicate  that  the  ii'  popygium  of  the  male  is  disenjrnjicd. 

The  estalilisliment  of  th  •  characters  of  this  geims  on  so  scanty 
materials  ])resents  nniny  (illiculties.  I  believe,  however,  that  the 
followiuff  nmy  l»e  regarded  at  least  ns  a  temporary  delinitimi. 
Tiie  first  joint  of  the  antciiiuv  without  hairs,  the  second  not  reach- 
ing tliuml)-like  over  thij  third,  on  the  uj>per  side  nuich  longer 
than  on  the  under  sid'  ;  the  third  joint  short,  without  distinct 
hair  an('  with  a  dorsal  arista.  The  ]iosterior  transverse  vein  very 
ol)li(pie  ;  the  last  segment  of  the  fourth  longitudinal  vein  runs 
much  forward  in  its  ec  jiid  portion  and  ends  in  the  vicinity  of  the 
third  longitudinal  vein,  so  that  the  first  posterior  cell  hecomes 
very  mirro>v  near  iLs  end.  The  first  joint  of  the  hind  tarsi  is 
without  bristles. 

The  name  of  '  iie  genus  (from  nxoiyioj,  oI)li((ne,  and  vtvpov,  the 
nerve)  has  reference  to  the  extraordinary  oblitiucness  of  the  pos- 
terior transverse  vein.  « 


\-.U 


1.  p.  Iinivittatus  Loew.  9- — Viridis,  thoracis  vit(a  mediA  alulo- 
ininisiiue  fasciis  lati.s  purjuireis,  aiitennis  jyediliusqiie  nijiiis,  feiuorilmrt 
viresceiitibus,  geiiibus  tibiarun)(jae  ant»^iioium  basi  testaceia,  alia 
cinerei.s.  • 

Green,  middle  stripe  of  the  thorax  and  broad  bands  of  the  abdomen  of  a 
purple  color ;  antennfe  and  feet  black,  the  knees  and  the  basis  of  the 
four  anterior  tibiae  dusky  yellow  ;  wings  gray.  Long.  corp.  0.25.  Long, 
al.  0.23—0.24, 

Syn.  Plnijionniriiit  imiriUdtiis  LoEW,  Wien.  Ent.  Mon.  I,  43. — Loew,  Neue 
Beitr.  VIII.  69. 


'  M"  ^ 


\  ![• 


PT.ACnoNElIirS. 


lf>7 


I'lU'c  iiut  very  hrntid  fur  a  fciiiiilc.  snmcwlint  clcvntt'd,  ii|inii  its 
larirtT  upper  purl  willi  an  improsctl  nrHldlc  lint- ;  the  >iiiallir,  cdii- 
vcx  liiwcr  part  is  srparali'il   IVmiii  the  upper  part   liy  a  transver>« 
swelliuf?,  iuniiiiplelc  in  its  niitldle  ;  the  dense,  almost  silvery-wliilo 
dust,  enneeals  a  jrreat  deal  of  tlie  ^ruund-eolor  of  the  f'aee,      An- 
tenuiu   Idaek.      The  third  joiut  with  a  short,  liut   sharp  lip;    thu 
arista  rather  strong',  with  a  very  short   lait   dislinet   pulit  seeuee. 
Front    Itri^iht   nielallie  hlue-frreen.      The  cilia  on  the   uppi'r  orliit 
lilaek.  on  ihe  entire  lateral  and  lower  orl)its  white.      'I'lntra.x  n»e- 
tallie-^rreen,   only  on    the   lore   and    lateral   luariiin   with   a   litthi 
whitish  dust,   upon  the  niichllu  with  a  not   very  sharply  detined 
longitudinal  stripe,  which  in  some  directions  ap)»<'ars  more  l)la<'k, 
ill  others  more  l)rown  and  pur|)le,  soinetinns  of  a  lieantirnl  cinna- 
nion-browii  color.      Scutelhim  inetallic-jrreen,  with  the  usind  two 
strong  bristles,  otherwise  ]>are.      On  the  segments  of  the  al)doineii 
the  two  lirst  thirds  have  a  dark,  the  last  third  a  more  ))ale  color; 
the  color  of  the  former  i)art  shifts  from  black,  throngli  bronze- 
brown  into  a  boatitifiil  dark  vi(det  ;   on  the  lust  third  the  color  is 
chielly  metallic-green,  nevertheless  it  changes  on  the  anterior  part 
into  stccl-l)lue,  and  on  the  hind  nnirgin  of  the  segment  into  golden- 
green  or  almost,  a  co|)pery  color  ;   on   the   lateral  margin  the  last 
third  of  the  segments  is  coveri'(|  with  winte  dust.      Coxa'  Ijlack 
with  a  rather  dusky-green  lustre;   the  forenu)st  with  white  dust, 
clothed  with   delicate  white  little  hairs,  and  at  the  tip  wiili  a  few 
black   bristles.       Feet    black;    femora,   with    green    .K.^tre;   knees 
brownish-yellow  ;  this  coloring  extends  on  the  fore  tibiii;  as  far  as 
the  middle,  on  the  middle  tibhe  as  far  as  the  first  third,  while  on 
the  hind  feet  it  is  confined  to  the  tip  of  the  knee.      The  femora 
liave  on  the  under  side  from  the  basis  almost   as  far  as  the  tip, 
erect,  but  short,  whitish  hairs  ;  otherwise  their  hair  is  black;  mid- 
dle and  hind  femora  have  on  the  front  side  before  the  tip  a  few 
insignificant  black  bristles.     The  hair  u]>on  the  til)iio  is  altogether 
black,  very  short,  only  on  the  u])]»er  side  of  the  hin<l  tiliiu'  somo- 
what  longer,  so  that   its  great  density  is  easily  jierceivod ;  nil  the 
tibifp  are  beset  with  slKU't  and  not  very  nnmerous  black  bristles. 
Wings  tinged  with  smoky  gray,  the  veins  brown-black  ;  the  i)os- 
terior  transverse  vein  is  so  very  much  oblique  as  to  run  ])arallel 
to  the  hind  margin  of  the  wing ;    the  last  segment  of  the  fourth 
longitudinal  vein  ap])roaches  the  margin  of  the  wing  rather  closely, 
without  cbaiiging  its  course,  then,  however,  it  suddenly   turns 


».',-,> 


k 


t  :i 


•i   ■' 


:.J! 


f*k 


;'? 


.■f"! 


H 

'.■.■.1:1  ■:  ;'r  , 

i 

VI'   1 

IS" 

19S 


DII'TKIIA  OF  NORTH  AMiaiirA. 


[I'AKT  It. 


tnwanls  the  fn»iit,  sn  us  tn  cimI  nitlicr  fur  rnmi  the  lip  of  tlu'  wiiijr 
ill  the  vifiiiity  iirtlii>  third  l<iii^;ititiliiiul  vrin. 

Ifah.   Ciil.ii.     (Iliclil.) 

Obsr.rration. — 'I'liis  spccirs  is  ulso  fniiliil   in  Itt'uzil. 


Oeii.  XXXV.     MI!V<-.iLi;f>i. 

Tlio  (rctins  riiinralux  slinws  tin?  closest  rclafifiiisliij)  to  tlio 
frciicra  Scrlhii^  uimI  //iiilro/i/mrus.  It  aj^rccs  with  tliciii  in  tin- 
rollowiiiff  cliuractcrs  :  Tiu'  Ixidy  in  jrciicral  is  l)osct  willi  ncitlitf 
iiiiiiicroiis  nor  lon>f  liristlcs.  Wiiijfs  t'lon)fat«'(l  ;  tlic  posterior 
transverse  vein  very  elosely  npproxiiniited  to  tlie  marfrin  of  the 
winj;;  feet  ehiiifrated  and  slender;  the  first  j(»int  of  the  hind  tar>i 
on  the  upper  side  willntiit  bristles,  not  shorter  than  the  second, 
lint  in  the  majority  of  tlie  species,  loiijrer.  Fa<'e  in  l»oih  se.xes 
l)roud,  provided  with  a  small  tnl)erele  npon  the  lowest  third  of 
each  side  of  thoorhit,  and  with  an  indistinct  swelling'  running'  from 
one  tnliercle  to  the  other.  Antenniu  rather  j^hort,  the  first  joint 
witlmnt  hairs;  the  apparently  Ijare  arista  dorsal,  distinctly  two- 
joinled.     The  hypopyuinni  (tf  tln^  male  iiiihedded. 

The  aliove  mentioned  three  n'enera  diller  sufliciently  from  the 
other  freiiera  of  the  Jhtlii  Ii<tfi(»>ii(hf  Ity  the  altovi;  stated  characters, 
which  they  have  in  coninion.  The  jjeiins  Liancnlun  in  particular, 
however,  dilVers  from  Sirlhiit  and  I/i/tlrniihonift  in  the  followinjr 
jioints  :  1.  All  the  femora  are  slender  and  unarmed,  while  the 
{renera  of  S<-cllu>i  and  Hndrdji/ioriix  have  the  femora  very  much 
thickened  toward  the  basis,  which  at  least  in  the  males,  is  armed 
on  the  under  sido ;  2.  The  sejrnH.uts  of  the  uialomeu  are  beset 
with  bristles  before  the  posterior  marjrin,  which  is  nut  the  case 
in  the  s|)ecies  of  Srrlliia  and  of  J/i/drophoriis. 

The  freiins  Liantaliis  contains  as  yet  only  three  European  and 
one  North  American  species.  They  form  two  g'i<tuj)s  ;  in  the  first 
the  scutellum  has  only  four  l)ristles  and  the  exterior  appendages 
of  the  hypopygiuni  arc  more  lamelliform,  while  in  tlie  second  tlie 
scutellum  has  si.x  bristles  and  the  exterior  appendafjcs  of  the 
hyp(»pyffinm  are  Hliform.  To  the  first  jrroup  Iteloiifrs  Linncnhts 
Imitiilris  Scop,  and  Ii-ncnsfomu.-i  Loew,  to  the  second  L.  virens 
►^cop.  and  the  followin<r  North  American  species. 

Tho  name  of  the  genus  (from  xuoj,  smooth,  and  o^-xaxij,  aim) 


i::^  '  » -^- 


LlANt'AMS. 


10!> 


litis  riTcroiKT  to  tlif  uiianncd  Ton;  I't'i't,  by  wliicli  it  is  (listiiiguishtHi 
from  llic  next  rt'lulcU  gciiuru  of  Svellua  und  Jli/dru^jliurus. 


I.  li.  KCIIllHliH  LoEW.  %  und  9- — V'ir<>s(;«-ii8,  tlmrnciH  lineix  (|uiittinr 
iilMloiiiiiiiMiiiii!  fjiKciiM  oliHcurir*,  |i»iili()UH  ex  iiigro  viridihux,  gciiiliui*  IIhvis, 
aliit  iiiiii'is  iiiiiuulil  upiuiili  iiigiu,  guttuiu  fiiiulitluiu  iiicluilttntf,  oinutirt. 

(i iiisli,  four  liiu'S  upon  tlu'  thorax,  iiinl   tlitt   ImiulM   upoii  the  nli(loni»'n 

(lark,  fi'i't  lllacki^'l•-gr»'^•ll  witli  ^t-llow  kiif«',s  ;  llin  tip  t»f  llie  wiiii?  in  tli»» 
TiiiilH  witli  !i  liliK  k  Mpot,  wiiicli  contains  ii  snuw-wliilu  drop.  Lung.  uorp. 
(i.:2(J— 0.28.     Long.  ul.  o.:ii. 

Sv.N.  Lidntulus  yennutis  Lokw,  Nfue  ndtr.  VIM,  70,  1. 

(Mosi'ly  rclntcd  to  tlic  Kiin>|n'aii  A.  r//v'//s  Scop,  and  very  iiiucli 
like  it,  tiioiijrli  dilVcring  froin  it  in  tlic  nciiration  and  the  iiicturi' 
of  the  wiiijrs,  as  also  l)y  the  frreatiT  Iciijfth  of  the  lilifonii  appcnd- 
u^e.s  of  the  hypopyjrii.in.  niut'-jircenish,  soinewhat  jrray  from  pah' 
tlust.  Face  jrreeii  or  l)liie  with  rather  \vhiti>h  dust,  which,  how- 
ever does  not  conceal  the  >rround-cidor.  Tim  larp-  black  palpi, 
fringed  with  black  and  conipnratividy  htuji;  hair,  when  seen  from 
the  sid(!,  usually  appear  entirely  fjray-yellowish  on  account  of  tlu; 
dust,  with  which  they  are  covered.  Front  jrreeii  and  somewhat 
spotted  witii  whitish  dnst.  Anteniue  entirely  black.  The  cilia 
of  tile  posterior  orbit  black  aiiove,  whitish  ijclow.  The  upjier 
side  of  the  thora.x  has  two  narrow,  linear  loiijiiliidinal  stripes, 
separated  i>y  a  reddish-frray  middle  line;  these  stripes  are  rather 
black  in  fully  colored  specimens ;  there  are  Ix'sides  two  lateral 
stripes,  the  posterior  ]»art  (tf  which  is  bifurcated  near  the  trans- 
verse suture.  Thus,  not  much  is  left  of  the  beautiful  blue-jjreen 
color,  except  two  l)road  longitudinal  stripes,  bearing  the  stronger 
bristles.  Sciitellum  with  si.x  bristles,  as  in  A.  virciiti.  The  ab- 
domen is  jirovided  with  broad,  cop|»er-colorcd  or  l)roiize-l)rown, 
sonietiuies  almost  black,  transverse  bands,  on  the  jtoslerior  margin 
of  the  segments;  on  the  edge  of  these'  Itands  the  ground-color  of 
the  alMloineii  changes  often  into  yellowish-green.  ('o.\a',  femora 
and  tibia;  metallic!  black-green  ;  the  knees  yellow  ;  the  tarsi  black. 
Fore  ct).\ie  elongated,  cylindrical,  on  the  front  side  with  long 
whitish  hair,  at  the  tip  <iiily  with  a  few  small  black  bristles.  In 
the  male  the  second  Joint  of  the  fore  tarsi  is  nncomnionfy  short- 
ened and  soinewhat  thickened,  so  as  to  lie  the  shortest  of  all  j(dnts, 
and  uliuost  as  broad  as  it  is  long.     Cilia  of  the  tegulu;  whitish. 


^ .  '■*■ ' 


r    1 


r  fill 


.jti 

m--  '^ 

■■!'~;i: 

-s^' 

-t 

!>*■■' 

fv- 

^.:;..:j| 

■:      .■'■'4 

200 


inrrKUA  ov  N(»KTii  A>!i:in("A. 


[lAI-.T  II. 


Wiiifrs  with  l)Iiick  veins,  liviiliiic,  in  tlic  fVniiilc  with  Init  fVw  irrc- 
ffiiliu'  j?ray  spots  upon  the  iipiciil  Inill',  in  llic  nialc  niDrcuvcr  n(;ir 
tin'  tip  uilli  a  few  <i-i';i_visli-l»lack  lon^ilntlinal  siriprs,  iind  mi 
tin'  tip  ilsclf  with  a  hiai-ii  spot,  rontainiii,i>,-  near  tlic  end  ot'  tiic 
ionrlli  lontrilutlinal  vein  antcrioiiy  a  i-onnd  drop,  wiiicli,  llu-  Ijnlit 
ralliiif?  'irou}j:l»  it,  l>as  a  snow-while  relh-etion  ;  on  the  anterior 
nnir};i;i  of  this  (h'op,  in  the  Idaek,  there  is  always  a  smal!  paler 
spot.  The  oiitliiu'  of  the  win^s  in  the  male  dilVers  eonsideralijy 
from  tlnit  of  tiie  female,  heiiiu;  not  oidy  imrrower,  hut  also  sinnated 
on  their  whole  jtosterior  nnir;:-in  in  a  peeidiar  nninner.  'I'lie  ex- 
terior ap|)endafres  of  the  short  hiaek  hypopyj>-iuin  are  two  very 
loni;  threads,  which  reach  liaek  almost  as  far  as  the  hasis  of  the 
al»di>nien,  and  whieh  are  beset  on  their  whole  k'ngth  with  very 
h)n<r  i)ale  hairs. 

JIah.    Middle  Stales.      (Oslen-Saekeii.) 

r.eii.  XXXVI.    scr.i.i.i's. 

Chdrnclcr^.  First  jcdnt  of  tiie  antenna'  eonipariitively  narrow, 
hare  ;  the  seeoml  short  ;  the  third  ronnded,  ehtnji'ated  only  in  a 
hitherto  Jindeserilx'd  Kuropean  species,  lud  excised  on  the  edfre. 
.Vrista  dorsal,  apparetitly  hare,  distinctly  two-jointed.  The  front 
on  the  vertex  hut  little  deepened,  a  little  nari-ower  anteriorly. 
The  eyes  much  hifrher  than  Itroad,  encased  helow  liy  the  linear 
cheeks.  Face  of  middlinji:  hreadth,  very  lonjr,  reachinji;  somewhat 
helow  the  lower  'orner  of  the  eye;  its  lowest  sharply-ediicd  part 
is  separated  from  tiio  narrowly-imu'frined  eyes  by  an  incision 
which  turns  away  from  the  eyes  o?i  its  upper  end.  I'alpi  recum- 
bent, of  middling!:  and  about  ecpial  size  in  both  se.xes.  Proboscis 
stout.  Fpper  side  of  the  thora.x  n|M)n  its  middle  with  but 
short  bristles.  Scutellum  (hit.  with  two  l)ristles.  Abdomen  with- 
out bristles  and  only  with  scattered  and  very  short  hairs,  'i'ln; 
abdomen  ot'  the  malo  has  fivy  scfrinents  ;  tin;  first  four  are  norimilly 
developed,  while  the  lifth  is  usually  shortened,  often  also  of  a 
dillerent  color;  the  followinpj  sefjment  is  formed  by  tin;  short, 
half-imbedded  liypopyfjiuin.  At  its  low(  r  end  there  are  two 
snnill,  dark  lamelhe,  directed  ohli(piely  downwards,  which  lie  so 
close  tofrether  ns  to  present  the  shapes  of  a  stout,  dentiform  pro- 
jection ;  besides  these,  the  comparatively  thick  penis,  bent  down- 
ward and  curved,  may  be  seen,  but  no  other  appendaj^es.    IJetweeu 


scKLna. 


Ilic  fourth  and  fifth  iil)(ioiiiiiiiiI  scf^iiiciits  of  the  male,  however,  two 
loii^r,  mostly  pah'-cohtri'tl  tape-  or  ihrcail-liki-  appciidii^cs  iiro'-iidc 
whirli  are  turned  cither  Imekward  or  ontwanl  ;  their  phiee  of  in- 
sertion seems  to  forbid  us  t(t  take  them  for  representatives  of  tlie 
ordinary  external  appenda<,fes  of  the  hypopy^riiiin  ;  tluis,  we  are  led 
to  rejz;ard  as  such  tiie  jirevionsly  mentione(l  inferior  appendattes  ; 
if  we  do  this,  tlien  the  representatives  of  the  interior  appendajics 
will  he  wantinjr.  nidess  these  same  tape-  or  threaddike  appenda,i,n'S 
■tic  laken  for  them.  If  the  point  of  insertion  of  the  tajiedike 
appendiiii-es  was  really  at,  the  place  where  they  first  appear  on  the 
outside,  then  the  (pu'stion  would  he  s<tlvcd,  as  in  such  a  case  they 
could  not  he  considered  as  appciidap's  of  the  hypopyjriuni  ;  that 
h(»wevcr,  this  is  not  tin-  case,  and  that  they  rather  orijrinatc  much 
further  inside,  and  ]»roceed  from  there  upwards  hetween  the  foiirlh 
and  fifth  al»doiiMnal  sejrments,  hefon;  they  reai)pcar  on  the  surfin-e, 
can  he  distinctly  set  n  in  many  specimens;  to  ascertain  their  triu^ 
phu'c  of  insertion  re(piires  tlu'  anatomical  exannnation  fif  fresh 
specimens,  for  which  I  have  no  opportunity  at  j)rescnt.  'I'hc  form 
and  position  of  the  hyitopyg-ium  and  of  its  appendaires  in  the  mah's 
of  Si-<lli(s  has  so  many  peculiar  features,  that  it  is  dillicuit  to 
arrive  at  a  conclusion  ahout  the  tru"  mcaniiifj;  of  its  dilVcrent  jjarts. 
The  female  ahdonieii  consists  of  live  normally  developed  scunients, 
followed  hy  one  sej;nient  more,  which  is  shortened,  rctraclcil,  jiiid  of 
a  dilVerent  color;  IIk;  extreme,  somewhat  opaijuc  tip  of  the  femah; 
ah(h)meii  is  heset  with  l)Iack  l)ristles.  The  feet  are  trencrally 
hare,  middle  and  hin<l  feet  much  lon<;-er  than  the  fore  feel,  iind, 
except  th((  thick(!iMn<!:  of  their  femora,  which  i>elonjrs  to  the  males 
of  some  species,  they  are  more  slender  than  the  fore  feet  ;  fore 
femora  thickened  towards  the  hasis,  on  the  under  side  with  nume- 
rous hristles;  fore  tiltia*  on  the  under  side  with  bristles,  elonjrali'd 
at  the  end  into  a  larfr«'  tooth,  which  is  still  lar<rer  in  the  males 
than  in  the  fenudes  ;  the  males  have,  nn)reover,  a  stronjr  spine  on 
the  inside,  not  very  far  from  the  basis;  the  nuddle  tibia' of  the 
male  are  variously  decorated  with  lonjjc  curly  hairs  and  sliiV  i)ris- 
tles,  while  those  of  the  fenude  are  ])lain  ;  the  hind  tilda-  ami  the 
fe(!t  in  both  sexes  jdain,  tin;  joints  of  the  latter  of  decreasing 
lenjith  ;  the  empndium  distinct.  Wintrs  long  and  narrow  ;  the 
])osterior  transverse  vein  (»bli(jU((  and  close  to  the  nuirgin  of  the 
wing ;  the  third  and  fourth  loiigitudinul  veins  converging,  the 


-W'-'  '•'■:---\\ 


i;. 

'i:  #3 

■-,1*  ■'.  ■■* 

i 
■'} 


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r 
■■>), 


mm 

M*     '  i  :  ;  ■'I.  ■  ■: 
.1      ■  I  ■■  i'„  ■  ■  . 
i  ■    '  ."    '/'■'•  *-.' 


■  7  litn- 


'!(<■   ..' 


202 


DirTF.UA  OF  Nr.r.TU  a:\:;::!I(\v. 


[part  II. 


sixili  iilinost  entirely  obi  iterated  or  existing  only  as  but  u  short 
riKJiniciit. 

Jii  till!  genus  Lianraliis  we  have  already  mentioned  the  eharac- 
ters  wliieh  this  genus  has  in  eduinion  with  I^ccIIks  and  Hydm- 
phoius,  as  als(j  those  which  distinguish  Scelliis  from  Liaiualiis ; 
to  the  latter  nniy  be  added  the  jiresenee  of  the  two  ajuiendagi-s, 
peculiar  to  the  nndes  of  t^ct'ltua.  The  presence  of  these  apj)end- 
i\^v^  also  distinguishes  the  species  of  Scellus  from  Ilijdroplmru.-i, 
where  they  are  entirely  wanting.  ^Moreover  the  under  side  of  the 
fore  femora  and  of  tlie  fore  til)iie  in  the  species  of  SccUn.-i  is  besot 
wilii  long  spines,  catching  into  each  other  when  the  knee  is  bent, 
while  in  the  species  of  JJijdro/ilioni.s  there  are  at  the  utmost  some 
spine-like  bristles  on  the  under  side  of  the  fore  femora  near  the 
basis,  otherwise  the  under  side  of  tlie  fore  femora  and  of  the  fore 
tildic  is  only  beset  with  very  short  thorn-like  l)ristles. 

'I'lie  name  of  the  genus  (from  oxfxxoj,  with  crooked  feet)  has 
reference  to  the  peculiar  structure  of  the  fore  feet. 

1  kn<»w  as  yet  only  si.\  species  of  SrelliDi,  of  which  three  are 
peculiar  to  North  America,  one  is  common  to  Europe  and  North 
Anjerica,  and  two  are  e.vclusively  Eurojjean  ;  one  of  the  latter 
species,  occurring  in  Sweden,  is  as  yet  undeseribed. 


i 


;'■■■  ^ 


^;-. 


Table  for  the  determination  of  the  Species, 


,  (  Wings  entirely  blackened. 

(  Wings  not  entirely  blackeneil. 
2  (  Apical  half  of  tlie  wings  black. 

(  Apical  half  of  the  wings  not  blai:k. 
o  (  Wings  entirely  tinged  with  blackish  gray. 

I  Wings  scarcely  a  little  tinged  with  gray. 


1  ezustus  Will/:. 

2  spinimanus  /^  '■ 

:5 

3  avidus,  n.  sp. 

4  filifer,  n.  sp. 


Dcscrijiliiin  of  the  S/iecifx, 

1«  S.  exiistlis  Walk.  ^  and  9- — Thoracis  dorso  aeneo-nigro  opaoo, 
al)domiiio  cupreo,  latera  versus  viridi,  nitidissimo,  halt^iribus  nigris, 
alls  nigricantilius  atlversus  costani  nigris,  latnellis  analilms  maris  alhis, 
ill  basi  uigiis,  apicem  versus  flavis,  in  suninio  aj)ice  puneto  nigro  notatis. 

The  upper  siile  of  the  tliorax  bronze-lilaek,  opaijue  ;  the  abdomen  f'opi)er- 
colore.i,  laterally  green,  very  bright  ;  halteres  lilack  ;  wings  blackish, 
towaids  the  fore  margin  entirely  black  ;  the  anal  appendai,"'s  of  the  male 
are  white,  near  tlie  root  black,  towards  the  tip  yellow,  at  tho  extreme  tip 
with  a  black  spot.     Lung.  corp.  0.22.     Loutj.  al.  0.2tJ. 


'v*' 


BCKLLLS. 


203 


Sy.n.    Miditerux  cxiistus  Wai.kkh,  Ijipt.  S.iiiiul.  211. 
Si  I  Has  (jiixliin  LoKW,  Nt'tie  Ik'itr.  Vlll,  71,  1. 

jMdlc.  Ijlack.  Tlio  faco  ratlu-r  narrow,  o])a<ino  from  a  briffiit 
oclnT-yullow  (lust.  Anteiiiia'  bhuk.  Fr  .at  fovercd  willi  wliite 
(lust.  The  middle!  of  tiie  iipoor  side  of  the  lliorax  is,  at  least  in 
my  s[)eriiiu'n,  black,  opa((ii(',  and  exhibits  some  traces  of  ^ray 
dust;  towards  the  lateral  marjrin  it  i;' more  briu-hl  and  shows  a 
less  disliiu't  coppery  relleclion  ;  on  the  lateral  mar<>in  itself  then^ 
is  a  broad  lonjritndinal  strijjc  covered  with  white  dnsl.  Scutellum 
with  two  l)ristles,  opacpic  ujton  the  middle,  with  a  thin,  almost  im- 
])erceplil)le  coat  of  white  dust,  briji'ht  on  tin;  sides.  I'leunu 
bronze-black,  on  the  upper  half  with  a  dusky  copper-colored  reflec- 
tion, on  the  lower  half  with  a  thin  j;-ray-whitish  dust.  Alxlomen 
l)rillianl  coppery-red,  in  a  certain  lijz;hl  ii  ai)pears  i)rass-colored 
upon  the  posterior  segments,  in  an  ol)li(iue  direction  even  jrreen  ; 
its  first  seninent  almost  reddish-violet.  The  upper  appi'iidiifjes, 
)>ecnliar  to  the  males  of  Sccllux,  are  of  a  very  considerable  lenjrlli, 
white,  near  the  root  black,  somewhat  eidarjred  at  the  tip,  curved 
towards  each  other  and  of  a  yellow  color,  at  the  extremi;  tip  black 
and  i)rovided  with  a  tid't  of  pale  hairs,  which  are  turned  back- 
wards. CoXie  black,  with  a  thin  white-frrayish  dust,  the  foremost 
with  extremely  short  pale  hairs,  with  a  few  stiff  l)lack  little  hairs 
and  near  the  ti|)  with  a  few  black  bristles.  Feet  black,  the  femora 
more  m;'tallie  f>'reen-black,  with  copjjcry  reflections;  the  tore 
femora  but  short,  very  uim-h  thickened,  toward  the  basis  on  the 
whole  under  side  beset  with  bristles  of  different  len,trth,  on  the  an- 
terior side  with  a  row  of  stift"  black  l)ristles  ;  middle  femora  elon 
fyated,  thin,  gently  curved,  on  the  under  side  almost  entirely  bare; 
the  hind  femora  near  the  basis  of  the  under  side  are  enlarired  into 
a  hirjre  blunt  appeiulage,  l)eset  with  larjre  black  spines,  lu'vond 
this  appendage  there  is  an  arch-like  excision;  then  again  they  are 
stouter  and  beset  on  the  under  side  with  l)lack  bristles.  The  fore 
til)ia',  which  are  comparatively  stout,  bear  on  thi;  front  side,  not 
far  from  the  basis,  a  stout  black  thorn,  their  tip  is  elongated  ;nt(» 
a  coarse  tooth  and  their  under  side,  which  is  beset  with  black 
bristles,  has  sonn-what  bcfure  this  tooth  a  small  excision  ;  mithlle 
tibiie  long  ami  rather  slender;  their  first  half  has  only  three  short 
bristles;  the  second  is  fringed  on  the  front  sich;  with  a  row  of 
short  black  bristles  ;  upon  the  posterior  side  somewhat  beyond  tho 


I.--, 


i  -i 


'f  • 


'il 


\^r: 


-'"111  I 


■'  ■!  •'••.. 


204 


niPTKIlA  OF  NORTH  AA.KHICA. 


[>• 


AiiT  ir. 


middle,  tliorc  are  a  few  lonp;  black  bristles,  and  between  ll 


ICSC 


iind 

the  tip  (tf  the  til)ia,  some  lou^-,  eiiily  iilack  hairs.  The  hind  tibia; 
are  niueh  stronger  than  tlie  middle  tiliiie,  their  lirst  half  is  st(»utcr 
than  the  seeond  and  the  front  side  l)efore  the  tip  is  armed  with  a 
strong  black  bristle.  Tarsi  jtlain,  their  joints  of  decreasing  length, 
the  lirst  joint  of  the  middle  tarsi  with  a  few  bristles.  Ilalteres 
])rownish-black.  Wings  bli!  kish,  all  their  veins  l)roadly  margined 
with  black  ;  the  nuirgins  of  the  costa  and  of  the  lirst  fonr  longitu- 
dinal veins  are  entirely  conlliient,  so  that  the  anterior  part  of  tlio 
wings  apjiears  altogether  lilack  ;  upon  the  ndddle  of  the  i)oslerior 
transverse  vein  and  u])on  the  curve  of  the  last  segment  of  the 
fourth  longitudinal  vein  there  is  a  black  sjxjt ;  the  costal  cell  is  of 
a  dark  brown  color. 

Female..  The  only  female  which  I  possess,  is  not  as  well  pre- 
served as  the  described  male,  especially  the  characters  of  the  face 
cannot  be  recognized  with  certainty;  I  would  therefore  recall  the 
circumstance,  that  the  face  of  most  of  the  fennvles  of  Sirllioi  is 
less  yellow  than  in  the  males.  The  first  joint  of  the  anteiiuie  in 
the  female  is  considera)»ly  shorter  than  that  of  the  male.  Fore 
femora  and  fore  til)iie  less  stout,  though  the  tip  of  the  latter  has 
also  a  dentiform,  but  less  stout  elongation  ;  their  under  side  has 
no  excision  before  this  tooth  and  the  front  side  of  the  tibia-  no 
thorn.  Middle  femora  not  curved,  on  the  larger  half  of  their  under 
side  with  a  few  sparse  bristles.  Midille  tibia'  plain,  upon  the  lirst 
half  with  a  consideral)le  number  of  black  bristles,  upon  the  latter 
})art  of  the  posterior  side  without  the  curly  hairs  which  are  found 
in  the  male.  ]lind  femora  jtliiin.  slender,  towards  the  tij)  but 
very  little  stronger,  upon  the  second  part  of  tlie  under  side  with 
about  si.x  rniher  strong  black  bristles.  Hind  tibiie  without  the 
strong  bristle  which,  In  the  males,  exists  at  the  tip  of  the  front 
side. 

Ilab.  Middle  States.     (Osten-Sacken)  ;  Illinois.     (Le  Baron.) 

"Z,  S.  spininianUS  Zktt.  %  .uid  9. — Thoracis  dorso  obscure  spneo, 
albido-jKitliuoso,  opaco,  aV)(loniine  ex  viridi  cupreo,  iiitido,  lialteribus 
subfuscis,  alls  iiigris,  basi  et  costre  diniidi.'e  limbo  gu>)albidis.  iiiargine 
postico  into  cinereo,  lamellis  analibtjs  maris  albis,  basim  versus  infra 
nigro-marginatis,  apicein  versus  llavis,  in  suiuuio  apice  puncto  fusco 
iiotatis. 

The  upper  side  of  the  thorax  dusky  bronze-colored,  with  whitish  dust ; 


SCKLLUS. 


205 


aliilonicn  coppery- green,  briglit ;  halteres  lirowniVh  :  wirfrs  Mack,  tliouph 
tilt!  mot  and  the  iiiargiii  of  half  the  costa  is  whitish,  the  whole  posterior 
iiiaruiii  «ray  ;  anal  ajipemlages  of  the  male  white,  towanls  the  hasin  on 
tlie  under  siile  with  a  hlack  margin,  towards  the  tip  yellow,  at  the  ex- 
treme tip  marked  with  f  hrown  spot.     Long.  corp.  (LIT).     Long.  al.  0.1'.'. 

Syn.   l/ijilro/ihoni.-i  iiotdhm  Zkitkksi ki>t,  Ins.  Lapp.  701,  4,  //(  olm. 

llijilidjihorua  sjiiiumnniiii  ZKTiKusrKirr,  Dipt.  Scand.  II,  44.'),  .I. 

Moh\  Blackish  hroii/.e-culonMl.  Tlie  fmn-  is  ('(mijtnralivcly  a 
littio  Iti'uader  tiian  in  S.  e.rttstus,  covoitmI  vvitli  brifrlit  (tcliro-ycllow 
(lust  and  opa'jue.  Antonmu  Idack.  Front  with  whitish  tlust. 
The  fri'oinul-c'uior  of  the  thorax  is  (»f  a  cMHtpery-hronzc  ;  u))on  tlu' 
niicUlit'  of  the  ujiper  side  more  of  a  hlackish-lironze,  l)ut  almost 
everywhere  so  thiekly  covered  with  dust  that  the  copjx'ry  lustre 
is  only  very  little  pereeptilde  ;  tiie  dust  on  the  upjjer  side  of  the 
thora.x  is  snow-white,  ui)on  the  two  longitudinal  stripes  near  the 
lateral  marj^in  it  is  less  thick,  so  that  the  coppery  reilect ion  of  the 
{iround-color  is  more  distinct ;  upon  the  middle  there  are  two  nar- 
row, dark  longitudinal  lines,  close  to  each  other,  which  do  not 
reach  as  far  as  the  posterior  nnirgin  of  the  thorax.  I'pon  the 
]»leura'  the  color  of  the  dust  is  more  yellowish.  The  scutcllum  has 
two  l)ristles,  is  rather  opaque,  with  a  thin  whitish  dust.  AI)do- 
men  green,  mostly  with  a  coi>j»ery  lustre,  which  l)ecomes  much 
more  i)right  near  the  lateral  margin.  The  anal  apjtemhiges  are 
of  middling  length,  white,  near  the  i)asis  on  the  lower  nnirgin  with 
a  narrow  black  bcn'der,  and  on  the  upju'r  margin  usually  nuirked 
with  a  blackish  spot ;  beyond  the  nuddle  they  are  inflected  uj)- 
wards  and  gradually  assume  a  yellow  color;  their  extreme  tip  is 
marked  with  a  snnill  ))rowii  spot  and  bears  a  small  tuft  of  delicate 
])ale  hairs,  which  are  turned  backwards;  about  the  nnddle  tif  the 
interior  margin  there  is  a  similar  jjubescence ;  between  them, 
towards  the  anal  region,  there  is  a  snnill  tuft  of  delicate  whitish 
hairs.  Coxte  bronze-l)lack  ;  the  four  anterior  with  yellow  and  the 
two  hind  ones  with  a  rather  whitish  dust;  the  fore  coxic  with  very 
short  and  delicate  i»ale  hairs,  near  ami  ujion  the  tip  with  a  few 
black  bristles.  Feet  black,  femora  and  tibite  more  l)lack-green, 
the  former  bright  coppery.  Fore  femora  short,  towards  the  basis 
very  much  thickened,  beset  on  the  under  side  with  bristles  of  dif- 
ferent length,  on  the  front  side  with  a  row  (»f  stiff  l)hick  bristles. 
Middle  femora  long,  stronger  than  in  ,S.  cri/.s/w.s  and  more  curved, 
on  the  latter  half  of  the  under  side  with  erect  black  Ijristles.    Hind 


^ 

f '     ' 
1 

i 

k     '■■■ 

■' '     ;  r' 
h   *. .; 

■  .  ■  ;i  ■ 

w 


;:■'.'■  Ml. 


I. 


.  '■■  h'  it  if"-;    1. 


':^i 


■:'i 


;;<': 


1: 

m 

W'.y- 

m 

20G 


DII'TKRA  OF  NORTH  AMERICA. 


[part  ir. 


tViiujra  (if  a  plain  structure,  not  stouter  than  the  middle!  femora; 
tiieir  under  side  lias  only  close  liefore  the  tip,  a  few  lilack  liristies. 
The  eoiiij»iiratively  stout  fore  tihiiu  have  on  their  front  side,  not 
fiir  from  tlicir  hasis.  a  stout  black  thorn  ;  their  tii)is  elonjjatid  into 
a  very  stout  tooth,  !)efore  which  the  underside  of  tiie  til)ia',  which 
is  beset  with  strong  Ijristles,  has  a  small  excision.  Middle  til^iie 
not  (piitc  so  long  and  slender  as  those  of  S.  cnixdis,  on  the  up^ier 
side  only  with  three  or  four  short  bristles,  on  the  under  side  with 
a  row  of  extremely  long,  straight,  erect  black  bristles,  and  on  the 
hind  side  with  long  curved  hairs,  which  latter  are  more  dense  near 
the  tip  and  curl  tij)  to  the  shape  of  a  lock  of  hair.  Hind  tibiie 
plain,  scarcely  stouter  than  the  middle  tiidai ;  on  their  upper  side, 
not  far  from  the  basis,  there  is  a  strong  bristle,  and  on  the  latter 
half  a  few  small  l)ristles  ;  the  under  side  is  beset  with  short  small 
bristles,  which  are  isolated  upon  the  first  ))art  and  closer  together 
and  in  more  regular  order  uixm  the  second  half;  at  the  end  of  the 
under  side  there  is  a  considerable  number  of  less  strong  and  less 
short  bristles,  of  which  the  last  is  distinguished  by  its  greater 
length  ;  on  the  outside  of  the  tij)  of  the  tibia;  there  are  several 
short  and  tine  longer  anci  curved  bristle,  which  has  almost  the 
thickness  of  a  thorn.  Tarsi  plain,  the  joints  of  decreasing  length, 
the  first  joint  of  the  fore  and  of  the  middle  tarsi  with  more,  that 
of  the  hind  tarsi  with  less  bristles.  Ilalteres  yellowish-brown,  the 
lower  part  of  the  knob  more  dark.  The  wings  of  uiuform  breadth 
and  at  the  end  more  rounded  than  in  the  other  species ;  an  nii- 
connnonly  large  black  spot  covers  their  apical  half  with  the  excep- 
tion of  a  l»roa(l  gray  border  on  the  posterior  margin,  and  extends 
as  a  broad  cloud  along  the  fifth  longitudinal  vein  almost  as  far  as 
the  anal  cell ;  inside  of  the  discoidal  cell  it  is  somewhat  ))alcr, 
otherwise,  however,  so  dark  that  the  two  black  spots,  peculiar  to 
this  genus,  upon  the  po.sterior  transverse  vein  and  upon  the  last 
segment  of  the  fcturth  longitudinal  vein,  can  oidy  be  ])erceived 
when  the  wing  is  held  towards  the  light;  the  anterior  part  of  the 
wing  from  the  basis  as  far  as  the  middle  is  dingy-whitish  hyaline; 
the  anal  angle  and  a  broad  border  along  the  posterior  margin  are 
more  hyaline-gray. 

JFlab.   Fort  Resolution,  Hudson's  Bay  Territory.     (Kennicott.) 

Female.     It  is  distinguished  from  the  male  by  the  following 

characters  :   Face  with  pale  yellow-grayish,  front  with  brown  dust. 

The  middle  of  the  upper  side  of  the  thorax  with  yellow-brownish 


SCELl.US. 


2CT 


dnst,  marked  with  a  few  spots  of  wliitisli  dust.  Its  latoral  stripes 
are  eoverod  with  brown,  the  edjre  of  the  lateral  inar};iii.  however, 
again  with  gray-whitish  dust.  The  al»d<jinen  is  nutre  green,  k'ss 
eoppery  and  less  bright  than  in  the  nuile.  The  dust  ujiou  the 
])leune  and  upon  the  fore  eo.\a3  is  less  yellow.  The  fore  femora 
are  of  a  similar  structure  as  those  of  the  male  ;  the  fore  tibia'  with- 
out a  thorn  on  the  inside,  elongated  at  the  tij)  in  a  much  smsiller 
and  sharper  tooth,  before  which  there  is  no  excision  ;  otherwise 
the  feet  are  plain,  the  middle  and  hind  femora  straight  and  much 
more  slender  than  in  the  male  ;  middle  and  hind  tibia;  only  sparely 
beset  with  scattered  bristles. 

Obsfrradon. — As  I  do  not  possess  a  N(>rth  American  female 
of  S.  Kjnnipcs,  I  have  prepared  the  above  description  fr(»m 
Swedish  .specimens. 


3.  S.  aviilllA,  nov.  sp.  % . — Thoracis  dorso  a?reo-ni,irro,  nitido,  mar- 
gitie  et  linea  media  cinereo-pollinosis,  pleiirariim  plaea  suiieia,  atxlo- 
inineque  t'X  viridi  Iwte  cnpreis,  iiitidissiiiiis,  haltorihus  all'is,  alls  finf- 
rei.s,  piuic-tis  duolius  iiigris,  altero  in  vena  tranrtVHrsa  postiTiore.  altnio 
in  uUiiiio  vt^iiie  longitiidinalis  (luartre  segniento;  laiuellis  aiialilms  maris 
albis,  basi  et  apice  tainen  nigris. 

Upper  side  c>'  tlie  thorax  bronze- black,  shining,  its  margin  and  a  middle 
line  du8i  with  gray  powder;  a  large  spot  on  the  upper  part  of  the 
pleurae  and  the  abilomen  bright  greenish  copper-colored,  very  shining  ; 
halteres  white  ;  wings  gray  with  two  large  dots,  one  on  tlie  posterior 
transverse  vein,  the  other  upon  the  last  segment  of  the  fourth  longitu- 
dinal vein;  the  aual  appendages  of  the  male  are  white,  but  their  basis 
and  tip  are  black.     Long.  corp.  0.17.     Long.  al.  0.21. 

Male.  Face  somewhat  broader  than  in  the  previous  two  spe- 
cies, dusted  with  bright  ochre-yellow  powder,  op;uiue.  Front 
with  white  dn<t.  Antenna'  black.  Most  of  the  upper  side  of  the 
thorax  bright  bronze-black  with  faint  violet  reflections:  its  whole 
margin  has  a  rather  broad  border  dusted  with  a  whitish-gray  pow- 
der, and  therefore  opaque  ;  there  is  also  a  narrow  middle  line, 
which  is  much  abbreviated  behind  and  likewise  dusted  with  a 
white-grayish  powder.  The  up])er  part  of  the  pleura\  from  the 
shoulder  to  the  root  of  the  wings,  is  entirely  without  dust,  metnllie 
greenish  copper-colored,  very  much  shining;  as  I  have  only  a  sin- 
gle specimen,  I  am  unable  to  judge  with  certainty  wlicilur  this 
large  shining  spot  is  also  present  in  fresh  sj)ecimens,  as  I  believe 
it  to  be,  or  whether  in  the  al)ove  described  specimen  it  is  merely 


i:  ;: 


I  ^i 

m 


■■      !i!« 


1^1 


i' 'il 


t 

i 
I 

I 


e   ! 


11' 


«;• ' 


li!  i: 


■  ■{■■ 


m 

i 

R 

■  H 

E? 

20S 


pii'TKUA  OF  N(tiiTir  A>:r.iurA. 


[ 


I'Airr  II. 


rubbcil  (iff;  the  oilier  jtarfs  of  tlic  ))UMirio  arc  dusted  with  jrray. 
The  sctili'lluiii,  wliich  liiis  two  bristles,  is  j^reeuish  Itroiize-eolored 
and  opiuiue.  The  very  shining"  alMlonieu  is  of  a  l;ri<iht  ectppery 
fulor,  l)ut  assiiiues,  when  its  suiiaec  is  Inoked  upon  in  a  vory  ol)- 
]i(|Ue  direct  ion,  a  <rreen  or  at  least  brassy -yellow  eolor.  The  tape- 
like anal  ai)peiidaf>es  are  very  loii^-,  somewhat  lilaekened  at  the 
basis,  and  still  more  so  at  the  tip  which  is  turned  upwards,  and 
there  beset  with  a  small  tuft  of  l)lacki>h  hair  directed  backwards; 
otherwise  their  maririns  are  not  hairy,  althoiijih  there  is  a  sinjile 
black  l)ristle  where  the  blaekenin;;  of  the  tip  l)egins  on  the  under 
side  in  the  vicinity  of  its  inner  iiuirj.'in.  Near  the  anus  between 
the  above  mentioned  two  apix-nda^es  there  ore  a  few  small  black 
liairs.  Coxie  greenish-bhudv,  with  white-yellowish  dust  ;  the  fore- 
most have  besides  some  |talc  hairs,  almost  inii)erceptil)le  on  account 
of  their  shortness  and  delicacy,  a  few  black  bristles  before  and  n}»on 
the  tip.  Feet  black  with  a  metallic-^reen  rellection,  which  gra- 
dually disa|)i>ears  t  poii  the  last  joints  of  the  tarsi.  Fore  femora 
towards  their  root  lot  so  much  thi<-kened  as  in  the  two  precediufj; 
species,  lieset  with  stroii;;  black  bristh's  of  diircrent  lenji'th  on  the 
under  side,  on  the  front  side  with  a  sjiarso  row  of  short  black  bris- 
tles. Middle  and  hind  femora  lonu:,  slender,  straif>'ht,  of  a  ])lain 
structure,  beset  on  the  second  half  with  a  imxlerate  number  of 
short,  scattered  black  bristles.  The  moderately  stout  fore  tibiie 
bear  on  their  anterior  side,  not  far  from  the  basis,  a  short  black 
thorn  and  are  prolonj,a'd  at  their  tip  into  a  larfre,  somewhat  clumsy 
but  sharp  tooth,  before  which  the  under  side  of  the  tibia,  provided 
with  bristles,  has  a  very  small  excision.  The  middle  tibia)  are 
long  and  slender  ;  on  the  upper  side  they  are  beset  with  only  three, 
on  the  anterior  side  with  about  seven  scattered  bristles  of  very 
moderate  length ;  on  the  other  half  of  their  hind  side  they  bear 
long  curly  black  hairs.  Hind  tibiie  slender,  straight,  rather  long, 
only  on  the  second  half  witli  a  few  isolated  black  bristles;  the 
bristles  on  the  outside  of  their  tip  are  also  only  short.  Tarsi 
l»lain,  their  joints  of  decreasing  length  ;  the  first  joint  of  the  fore 
and  middle  tarsi  on  the  under  side  with  numerous  black  bristles, 
the  first  joint  of  the  hind  tarsi  oidy  with  a  few  and  much  shorter 
bristles.  AVings  hyaline-gray,  somewhat  darker  towards  the  tip 
on  account  of  the  gray  margin  of  the  second,  third  and  fourth 
longitudinal  veins ;   upon  the  posterior  transverse  vein  and  upon 


SCELLUS. 


209 


II11'  middle  of  llic  Inst  sofrinciit  of  tlio  foiirtli  longitudiiml  vein  tliuru 
is  ii  ^•riiv-ljlii<.'lvi.>li  spot  of  (Miiisidci-ahlt'  si/c. 

Hah.  Fort  Kcsoliitioii,  Jliidsoii's  i>ii}-  Territory.     (Ivtiiiiicott.) 

4i  §.  filifrr,  nnv.  sp.  %, — Thor.icis  dorso  clni-n'o,  opnrn,  abiloniine 
ciiprco,  fiiiorfo-polliiioso,  sulxipaco,  lialteiihiiH  alliiilis,  alls  livaliiiis  iu 
luisi  subaliMdis,  apicciii  versus  ciiu-rea-striatis  ])iiiii:tis4ii(!  (IikiIuis  iiui- 
jusculis  nigriciintibiis,  alteio  didyiuo  in  vciiii  tniurtversii  posteriore, 
ftltcro  simplici  in  ultimo  vtMue  loni,'itudinalis  (]uarta'  segnicnto ;  lanudiis 
analibtis  niarid  angustissiuiis  albis,  in  basi  nigri^,  la  etuniutu  aiiit;*;  lla- 
viuantibus. 

Upper  side  of  the  thorax  gray,  opaciuo  ;  ab(h)nien  copin-r-colored  witli  gray- 
ish dust,  ratlicr  opacjun  ;  lialterfs  whitish  ;  wings  liyaline,  wliitisli  near 
the  root,  with  gray  striiK-s  towanls  the  tip  ;  upon  tlit^  jiostf'rior  transverse 
vein  with  a  donbh?  blackisli  sjiiit  of  considerabhi  size,  and  witli  a  simi- 
lar, but  single  sjiot  upon  the  last  segment  of  the  fourth  longitudinal 
vein  ;  the  anal  appendages  of  the  male  are  very  narrow,  white,  blai;k  .at 
the  basis  and  yellowish  at  the  extreme  tip.  Long.  eorp.  0.15.  Long. 
al.  0.20. 

The  narrow  face  is  ochro-yoUow.  AnteiiiUK  Ithick.  Front  with 
wliitc  dust.  Tiiorax  l)lackisli  hronzc-colored  with  coppor-culonMi 
rolloctioiis ;  on  the  iipi)t'r  .side  with  tliick  wliitish  dust,  whicli 
almost  c'OiK'eals  the  groinid-color,  opatpie  ;  upon  tlie  jdeura'  with 
a  somewhat  thinner  dust  of  tlie  .same  color.  \'\\n\\  the  middle  of 
the  njtper  side  there  are  two  narrow  parallel  lines  of  a  darker 
['olor,  which  do  not  reach  as  far  as  the  posterior  maro:in  of  the 
thorax.  Tlie  sctitellum,  whieli  has  two  bristles,  is  of  tlie  same 
color  as  the  pleunu.  The  frround-color  of  the  ahiloinoii  is  like 
that  of  the  thorax,  is,  however,  more  distinct,  not  lieinj;^  so  thickly 
covered  with  dust ;  towards  the  lateral  nuu'fiiu  of  the  abdomen, 
where  the  dust  almost  entirely  disappears,  there  is  a  briuht  eop- 
l)er-colored  lustre.  The  anal  api)endages  of  the  mule,  which  are 
turned  upwards  at  their  tip,  are  not  ribbon-liko.  as  in  the  ])re- 
viously  described  three  species,  but  liliform,  white,  black  at  the 
root,  at  the  tip  pale-yellowish  to  a  snniU  extent ;  on  the  middle  of 
their  exterit)r  nnirgin  there  is  a  dense  beard  of  delicate  little  white 
hairs  ;  there  is  no  tuft  of  hairs  at.  their  tip.  Between  them,  in  the 
anal  region,  only  a  'noderate  number  of  .short  delicate  little  hairs, 
which  may  be  easily  overlooked,  are  inserted.  Coxa3  of  a  bhick- 
ish-bronze  color  with  whitish  dust ;  the  fore  coxa3  have,  besidcd 
U 


m 


\M 


•    (.     :«fl^- 


■I'-m. 


210 


DIl'TKRA  OF  NOIlTir  AMKIUCA. 


[PAUT  If. 


1lit'  i>:ili',  nn(1,nn  nreojiiit  of  its  sliortucss  and  (Icliciicy,  jilinost  im- 
]»( r(t|ttil)l<(  iHiboHconci',  (luitf  a  iiiiiiiIh'I'  of  black  bristles.     J-'dt 
black,  the  ft'inora  with  a  nioro  coinjery,  the  tibiie  with  a  jiiorc 
mctallic-fri'ccMish  tiiijre.      Vura  femora  rather  stnnijrly  tliiekeind 
tiiwanis  the  l)asis,  on  the  under  side  with  stnni'i'  black  bristles  of 
dill'erent  lenjj:th,  on  the  front  side  only  with  an  imperfect  row  of 
short  black  l)ristles.     Middle  femora  moderately   thickened  and 
stroiifrly  curved,  on  the  under  side  of  the  basis  with  two  or  tiiree 
Hot  very  lonj?,  on  the  apical  half  with  a  larji'e  nundier  of  loiiu', 
straiii'ht  and  erect  l)ristle-like  Idack  hairs.     Hind  femora  plain,  of 
middlinf^  stoutness,  on  the  under  side  with  bristle-like  short  hairs; 
on  the  up))er  sid(!  with  two  lonji'er  black  bristles,  of  which  the 
larf?cr  is  not  far  from  its  tip.     J'ore  tiljiiu  stroufr,  with  a  laruc  and 
sharp  thorn  on  the  front  side,  not  far  from  the  basis ;  elongated  at 
the  tip  into  a  larjre  clumsy  tooth  ;  the  under  side  of  thetiltia,  pro- 
vided with  bristles,   has  no  distinct  excision  before  this  tooth. 
Middle  tibia'  lonu",  straifi'ht,  a  little  stroiifrer  in  the  neighltorliood 
of  the  basis  ;  tlse  lirst  two  thirds  of  their  under  and  jjosterior  side 
are  frii.ucd  with  lonji*  curly  black  hairs,  the  end  of  the  under  and 
front  side,  however,  with  lonn'  and  stiif  black  bristles  ;  on  the  under 
side,  where  these  bristles  beji'in,  there  is  between  them  a  some  what 
curved  black  thorn.     Hind  tiliia'  straijrht,  on  the  under  side  witli 
short  b\it  very  stronjr  black  bristles,  one  of  which,  bein<r  not  far 
fronr  the  tip,  is  remarkable  for  its  frreater  lenjrth  ;  on  the  outside 
of  the  tip  of  the  tibia;  a  few  shorter  and   one  somewhat  lonu-er 
curved  bristle  are  inserted.     Tarsi  ])lain,  their  joints  of  decreasinji: 
len.uth  ;  the  lirst  joint  of  the  lore  and  middle  tarsi  on  the  under 
side  with  black  bristles,  which  are  of  considerable  length  near  the 
basis  of  the  tarsi,  but  decrease  in  length  very  rai)idly  so  as  to  be 
very  short  on  the  larger  portion  of  the  joint ;  the  under  side  of 
the  lirst  joint  of  the  hind  tarsi  is  everywhere  beset  with  short  black 
l)ristlos.      llalteres  pale-yellowish,  but  the  basis  of  the  knol)  some- 
what brownish.     Wings  hyaline;  almost  the  whole   basal  third 
api>ears  sonu-what  whiti.><h  when  seen  in  a  certain  direction  ;  gray- 
ish stripes  along  the  second  half  of  the  second  and  third  longitu- 
dinal veins,  likewise  along  the  tij)  of  the  last  segment  of  the  fourth 
and  the  greater  ])ortiou  of  the  fifth  longitudinal  vein  ;   there  is 
also  a  gray  streak  1)etween  the  third  and  fourth  longitudinal  veins; 
upon  the  posterior  transverse  vein  there  is  a  blackish-gray  doul)le 
spot,  and  upon  the  middle  of  the  last  segment  of  the  fourth  longi- 


p 

•'  ■    ■ 

W:,.     * 

.     f 

\  a- 


t: 


lIVDIinl'llnlUS. 


'J  11 


(iiiliniil  vein  there  is  a  iiirix'T  ntmided  liliickisli-^rrnv  spot,  uliidi  is 

less  sliurply  (ieliiied  on  tlie  smIc  tiiriK.'d  tuwnnls  the  li|Mtr  the  wiiiL'. 

Hub.    Fori  lle.sulutiou,  Jludsou's  IJny  Territory.      (  Keiinieotl.) 


Hi 


Qeii.  XXXVII.     lIVDKOrilOlll  N. 

Charadcr.-'.  Tlie  first  joint  of  the  jintennie  sliort,  Iiare  ;  the 
.second  very  sliort;  the  third  rounded,  more  or  less  distinctly 
notched  nnder  its  lip;  arista  dorsal,  t\vo-Jointe<l,  apparently  liarc. 
Front  u  little  excavated  on  the  vertex,  narrower  anteriorly.  Kyes 
lar^;c,  hiu'her  than  broad,  encased  licluw  in  the  cheeks,  which  in 
their  structure  resenil)le  those  of  (hi/idc/iilc,  and  are  Itroader  thiin 
in  the  other  genera.  The  face  reaches  somewhat  Itelow  tin-  lower 
ooriu'r  of  the  eyes  ;  it  is  scarcely  narrower  in  the  nnile  than  in  the 
fennile,  its  two  upper  thirds  are  nsnally  a  little  ettiieave  ;  the  lowe.-t 
third  is  sei)aruted  from  the  upper  one  hy  two  knotlike  elevalions 
near  the  eyes,  is  convex  and  emls  in  a  sharp  rounded  edire.  j'ro- 
Ijoscis  of  moderate  thickness;  jtalpi  incinnlicnt,  in  lioth  sexes 
rather  small.  I'pjier  side  of  the  thorax  oidy  with  niodcrati'ly 
lonfij  hairs  ni'on  its  middle.  Scutellnm  rather  Hat,  thon,u'h  some- 
what elevated  alonji:  its  middle  line,  in  all  s))eeies  known  to  me 
with  four  bristles.  Abdomen  broad  and  rather  Hat,  very  short, 
withont  bristles;  il  has  live  seuinents  in  both  sexes.  'J'he  hypojty- 
jriiim  of  the  nnde  is  snuill  and  ind)edded  ;  at  its  lower  end  there 
are  two  small,  dark-colored  lamclhe,  oblicpu'ly  turned  down,  and 
so  closely  approxinnited  that  they  seem  to  form  but  one  clnm>y 
dentiform  jjrotuberanee  ;  usually  no  other  appemlajics  are  ^I'cn 
besides  these.  Feet  generally  bare;  nuddle  aiul  hind  feet  much 
longer  and  more  .slender  than  the  fore  feet ;  fore  femora  gradually 
rather  thickened  towards  the  root  ;  on  their  under  side,  either  in 
b(»tli  sexes  or  at  least  in  the  nuile,  with  short,  thornlike  bristles; 
sometimes  they  are  beset  with  a  few  longer  and  thornlike  bristles; 
fore  tibiiu  on  the  under  side  densely  beset  with  very  short  thorn- 
like  bristles;  mithlle  til)ia'  never  beset  with  longer  hairs,  even  in 
the  nnde;  tarsi  plain,  their  joints  very  much  decreasing  in  length; 
the  empodiiim  very  distinct.  Wings  long  and  narrow  ;  the  pos- 
terior transverse  vein  close  to  the  nuirgin  of  the  wing;  the  thii'd 
and  fourth  longitudinal  veins  usually  somewhat  converging  towards 
their  ends;  in  some  si)ecies  they  are  parallel  ;  the  sixth  longitudi- 
nal vein  usually  apparent  as  far  as  the  nuddle  of  its  course. 


4 


212 


Itll'TKKA  OP  NdllTII  AMKIIICA. 


[I'AKT  ir 


Jfifilmphorus  dillVrs  fntiii  Si-cIIkk  liy  tlic  font  femora  and  IWro 
til)iii'  iiol  Ix'iii^  provided  mi  tlie  under  side  with  Inii^  tliuriis, 
cuteldlif?  l)et\veei»  eiieli  otlier,  hy  tlie  tip  ot'tlie  (ore  til)ia!  lint  Itein^ 
flitiipited  iiiti)  11  eliiiiisy  |ir(ijeeti<iii,  liy  llie  middle  tiliiie  of  the  iiiide 
not  lieiii^  iKhii'iied  with  h)n^:  hair,  hy  the  liypupypiiim  not  having- 
those  peculiar  pale-eoh»red  appendages,  wliieh  distin^riiish  the 
Hpeeii'S  of  Scrlhii<,  \'e.  fJiiiiraliiK  has  no  notelies  on  the  tliinl 
joint  of  the  ttiitenmi',  its  fons  femoni  are  not  thickened  and  iiii- 
aniied,  and  it  has  Inislles  hefore  th(!  incisures  of  tiie  iil)domeii,  so 
tliat  no  mistakcr  can  occur  l»clwccii  the  species  of  l/i/ilrojilKirns 
and  Lidmnliix. 

The  name  of  Ili/iIroji/inrHs  (from  iijup,  water,  and  <^ipfiv,  to 
carry)  has  becu  hestowed  upon  these  insects  with  reference  to  tlie 
uliility  of  many  of  tiie  species  to  run  even  upon  ajiMtatcd  waters. 

The  species  of  J/i/itropliorun  known  to  nie  are  distriliuted  over 
Europe,  Nortliern  Asia,  Africa  and  Nortii  America.  'I'here  is  no 
l»erccptii)le  haltituai  dilferonfo  bctweeu  the  species  from  the  dif- 
ferent parts  of  tlie  gh)be. 

Tabic  for  ihi'  determination  of  tlie  S/nciis. 

1  innotatus,  iiov.  s]). 


,  (  Face  with  white  dust,  shining  green  above. 
*  Face  with  brownish-yellow  dust,  opanue  aliove 

IS  convtTgt 
Id  parallel 


,,  (  Tliird  and  fourth  longitudinal  veins  convergent. 
(  Third  and  fourth  longitudinal  veins 


-  pirata  /.»•. 
3  parvus  /.n\ 


\-k 


\.  iM 


Description  of  the  Species, 

1.  II.  ilinotatllH,  nov.  sp.  %  and  J .— Olivaceo-renens,  scntcllo 
virescente,  abdominr  -^iridi,  femoribus  til>iistine  viridibns,  tarsis  nigris, 
facie  supra  viridi-sp'.i.-ndente,  polline  pleurarvim  albido,  venis  alarum 
cineraspentium  atris,  longitudinalibus  tertiii.  et  (luarti  apicem  versus 
paulo  couvergentibus. 

Metallic  olive-brown  with  greenish  scutellum  and  preen  abdomen  ;  femora 
and  tibiie  green;  tar.si  black;  face  shining  green  above  ;  pleurre  with 
whitish  dust ;  wings  gray  with  black  veins  ;  the  third  and  fourth  longi- 
tudinal veins  somewhat  converging  towards  their  end.  Long,  corp, 
0.13.     Long.  al.  0.22. 

The  dust  upon  the  face  is  ycHow-brownish  immediately  below 
the  antenna) ;  otherwise  everywhere  white  in  the  male,  but  so  thin 
upon  the  entire  ui>})er  part  of  the  face  that  its  metallic-green  color 
l)ecomes  distinctly  i)erceptible  ;  in  tiie  female  the  face  is  covered 
with  white  dust   only  along   the    sides,   upon    the   middle  with 


IIYDUUPIIOIUS. 


218 


liria»iiisli(liist.  Aiitriiiiiv  entirely  liliick.  Fmnt  frreenish-lilnck, 
<i|iiii|iic  ;  si't'ii  ill  all  <il)lii|iii>  ilirectidii  ilie  euveriii^  of  lirowii  dust 
ll|Miii  il  lieeoiiics  )M're('|ilil)le,  wliifli  otiierwise  is  visilile  niily  iiii  tilt; 
iiiileriu,-  iiiiir^iii.  The  ^'I'ltiiiiil-color  of  tlie  oecipiit  is  green  himI 
lull  lillleeovered  willi  l)lii\Miisli-jfriiy  (lllst.  Tlie  ciiiii  of  tlie  ll|»|»er 
url)it  are,  as  usual,  liliiek,  llio  donst"  and  lialr-like  eilia  on  tlie  lute- 
riil  and  inl'erior  orltits,  liowever,  ni<ty-yellovvisli.  Tlie  ii|i|»er  sido 
of  lilt!  tliorax  metallic  olive-hrown  ;  the  liiiidiiiost  part  with  a 
nietallie-;rrecii  relleetion  ;  the  dnst  upon  it  is  lirowii.  Seiitelliiiii 
with  four  lirislles,  shiniiiir,  rather  jrreeii,  tlKHigh  soiiiewhiit  ei)pper- 
eolored  iipnii  its  middle.  I'leiiriL'  and  coxie  with  whitish  dii>t. 
Alidomen  metallie-greeii.  sliiiiiiifr.  espeeially  on  tiie  sides;  tiio 
short  hair  upon  it  is  Maekish,  upmi  the  sides  of  tlie  first  segment, 
however,  I'allow-yellowish.  Fore  coxiu  on  their  front  side  with  a 
very  short  ami  delicate  whitish  piiheseeiice,  Iiesot  on  the  upper 
half  of  their  exterior  side  with  a  moderate  numlter  <»f  eomparu- 
tively  long  Maek  liristles;  a  few  of  iIk'Hi  are  also  at  the  tip. 
Femora  slender,  green,  with  an  almost  iinpereeptilile  grayish 
dust  ;  the  fore  femora  as  usual  thickened  towards  their  l»asis,  and 
beset  on  the  under  side  near  the  Imsis  with  four  or  five  rather  long 
thoniliko  l)ristles  ;  Iiesides  these  there  is,  nearer  to  the  anterior 
nnirgiii,  an  apparently  inconijilelo  row  of  very  short  hristle-like 
little  hairs,  which  are  biitdiflicult  to  perceive.  Til)ia'  dark  green, 
the  foremost  on  their  under  side  uniformly  fringed  with  very  short, 
lilack  thornliko  bristles.  Tarsi  black.  Cilia  of  the  tegiihe  yel- 
low. TIalteres  with  a  dusky  yellow  jieduncle  and  with  blackened 
knol).  Wings  very  long,  tinged  with  gray,  not  darker  towards 
the  anterior  margin  and  with  veins  which  are  lilack  up  to  the  ex- 
treme root ;  the  end  of  the  third  loiigitudii.uiI  vein  is  somewhat 
curved  backwards  so  as  to  converge  distinctly  towards  the  fourth 
longitudinal  vein  ;  no  dark  spot  is  to  be  seen  neither  upon  the 
fourth  longitudinal  vein,  nor  niton  the  convexity,  crossed  by  the 
last  segment  of  the  fourth  longitudinal  vein. 

Hah.  Sitka.     (Salilberg.) 

Ohscrrafion. — Notwithstanding  the  not  unimportant  dinVrence 
in  the  coloring  of  the  dust  on  Mie  lower  part  of  the  face  between 
the  two  sexes  described  above,  I  have  no  doubt  that  both  lielong 
together.  From  the  other  Xorth  American  species,  known  to 
me,  //.  innofatiis  dift'ers  by  the  shining  green  color  of  the  uitpor 
part  of  the  face.     AiiKjiig  the   Kuroiiean  species  it  can  only  be 


i'.f' ■;■■ 


\ 

i\:i 


S   *  t  ■  t 


'  n 


214 


DIPTERA  OF  NORTH  AMKRICA. 


[part  II. 


compared  to  hallirus  Moifj^.,  atpinun  Walilh.  and  calloalomits 
Lvv.  It  can  easily  be  distiiig-uished  from  b(illicu>i  hy  the  dark 
knolj  of  tlio  lialteres  ;  from  (tlpinun  by  the  want  of  a  curved  tlinni 
at  the  end  of  the  fore  tibiie  ;  from  calloi^loinu.s  Ity  its  more  con- 
siderable size  and  a  comparatively  narrower  face. 

2.  II.  pirata  Loew.  9  . — Olivaceo-seneus,  thorace  et  scutello  cnpico- 
spleiitlt'iitiliUH,  abdoinine  viresceiite,  t'eiiioribus  titiiisciue  viiiililnis,  tarsis 
iJgris,  polline  faciei  opaciu  ex  fusco  ocliracoo,  pkuiraium  ijollinu  alhido, 
vunis  alarum  cinurasctiiitiuiu  nigris,  loiigituiiinalibu.s  terlia  et  ijuurtii 
apicem  versus  paulo  convergentibus. 

Metallic  olive-biown,  thorax  and  scutellum  with  a  copper-colored  rcllt^x- 
iou  ;  abdomen  greenish  ;  femora  and  tibiic  gretai  ;  tar.si  black  ;  the  dust 
upon  the  opa(iue  face  brovvnisli  ochre-yellow  ;  that  of  the  jiiiHirie  wliiUsh  ; 
wings  gray  with  black  veins,  the  third  and  fourth  longitudinal  veins 
somewhat  converging  towards  their  ends.     Long.  corp.  O.I'k     Long.  al. 

o.-i-i—o.-m. 

Syn.  JIijdro])horus  pinila  Loew,  IS'eue  Beitr.  VIII,  71,  1. 

Face  v.itii  l)rownisli-ye!Iow  dust,  entirely  ojjaciue.  Palpi  black 
aid  covered  with  black  hairs,  on  the  ui)i)er  side  with  Itrownish- 
yellow  dust.  Antennte  entirely  l)lack.  Front  brownish-l)l;ick, 
opa(iue  ;  when  seen  in  an  obli([ue  direction,  it  seems  as  if  partially 
covered  with  brownish-yellow  dust.  On  the  occiput  the  ground- 
color is  green,  however  almost  entirely  covered  with  grayish- 
yellow  dust,  or  rendered  very  opa(jue.  The  cilia  of  the  u})})er 
orbit  are,  as  usual,  l)lack,  the  dense  and  hair-like  cilia  of  the 
lateral  and  inferior  orbits  however,  yellow.  The  upper  side  of  the 
thorax  is  metallic  olive-J)rowii  with  a  copper-colored  reflection  ; 
the  scarcely  perceptible  dust  upon  it  is  brownish-yellow.  Scutel- 
lum with  four  bristles,  shining,  copper-colored  upcju  the  middle, 
on  the  margin  green.  IMeurie  and  coxio  with  whitish  dust.  Ab- 
domen ujore  green  than  the  thorax  and  with  a  coi)pery  tinge,  upon 
the  greater  portion  of  the  last  segment  and  upon  the  posterior 
margin  of  the  preceding  segments  usually  beautifully  green  ;  its 
short  hair  is  l)lackish,  oidy  upon  the  posterior  margin  of  the  lirst 
and  of  the  last  segment  it  is  i)ale.  Fore  coxa?  on  their  front  side 
with  a  very  short  and  delicate  whitish  pubescence,  on  their  ex- 
terior margin  fringed  with  black,  stiff,  but  not  very  strong,  bris- 
tles, of  which  there  are  also  a  few  on  the  tip.  Femora  slender, 
greer,  and  covered  with  thin,  almost  imperceptible,  whitish  dust ; 


HYDllOl'HOULS. 


i>15 


tlio  fore  femora  as  usual,  tliickc'iuMl  towards  the  Itasis,  on  thoir 
umk-r  sido  with  two  rows  of  tliorn-likc  hristlos,  the  inner  row  of 
which  I'eaclies  as  far  as  their  tip,  while  the  exterior  one  stops 
already  on  the  nii(Mle  of  the  femora.  Til)ia'  dark-green,  tlie  fore- 
most uniformly  fringed,  upcjn  their  U'lder  side,  with  very  short 
thorn-like  l)ristles.  Tarsi  black.  Oilia  of  the  teguhe  fallowish- 
yellow.  JIalteres  with  a  dusky-yellowish  ])eduncle,  and  witii 
blackened  knob.  Wings  very  Ictng,  tinged  with  gray,  not  darker 
towards  the  anterior  margin,  with  black  veins  up  to  the  extreme 
root  ;  the  end  of  the  third  longitudinal  vein  somewhat  approaches 
tin;  fourth,  so  that  these  veins  converge  distinctly  towards  their 
ends  ;  upon  the  posterior  transverse  vein  and  upon  the  convexity, 
which  the  last  segment  of  the  fourth  longitudinal  veins  crosses, 
there  is  a  somewhat  more  gray  sp(jl,  which  in  almost  invisible  to 
the  naked  eye. 

Ildb.  Pennsylvania,  District  of  Columbia.  (Osten-Sacken.) 
Ohscradioii. — It  is  dilliciilt  to  d(;termine,  whether  7/.  jufn/a  is 
not  one  of  those  four  species  of  JJi/drop/iondi  which  Mr.  Walker 
has  described  as  si)ecies  of  Mi'dcleriiH.  They  agree  in  a  good  numy 
resi)ects  not  only  anH)ng  themselves,  but  also  with  11.  ])iral(i, 
while  each  of  them  exhil)its  also  some  distinguishing  feature.  //. 
viridijla.'i  must  be  much  more  green,  according  to  Mr.  Walker's 
statements,  than  //.  pirala;  besides,  the  cilia  of  the  inferior  ori)it 
of  the  former  one  are  white,  while  those  of  the  latter  are  yellow; 
moreover,  its  abdomen  is  conical  and  longer  than  the  thorax,  an 
entirely  uncommon  character  for  a  female  of  JJiftlrop/ionis,  anil 
making  it  ahnost  doul)tful  whether  it  really  behjngs  to  this  genus; 
finally  the  veins  of  the  wings  are  said  to  be  brownish-yellow  near 
the  root  of  the  wing;  these  discrej)ancies  are  altogether  too  great 
to  justify  the  sup})(»sition  that  JJ.  jiirula  can  Ite  identical  with 
vu'idijIoH  Walker.  The  faci;  of  \Valker's  fenuile  of  II.  (jhibcr  is 
said  to  be  covered  with  giddeii-yellow  dust,  the  abdomen  on  the 
ui)i)er  side  clothed  with  brownish-yellow  hairs,  the  femora  rather 
stout  and  the  halteres  brownish-yellow.  These  dilferences  are 
likewise  too  important  to  adn;it  the  identity  of  il.  pirala  with  //. 
(jlahcr.  The  fice  of  Walker's  fenuile  of  II.  cfiri/.sohMjun  is  said  to 
be  also  covered  with  golden-yellow  dust;  the  wings  are  said  to  be 
brown  along  the  anterior  margin,  and  to  measure  only  three  lines 
in  expanse,  whereas  they  measure  six  lines  in  77.  pirala  Under 
such  circumstances  the  identity  of  these  species  is  out  of  question. 


>■: 


'ki 


■\\M 


^^ 


■•■■!|i?f!fS 

4m 


210 


DIPTKRA  OF  NORTH  AMKRICA. 


[PAUT  II, 


■■J. 


In  Walker's  description  of  H.  albojlnrens,  the  brownish-yellow 
color  of  the  dust  upon  the  face,  the  color  of  the  haltercs  and  th(3 
black  color  of  the  hair  on  the  upper  side  of  the  abdomen,  agree 
better  with  //.  pirata;  but  it  is  added,  that  the  thorax  is  covered 
with  brownish-yellow  dust,  that  the  dust  upon  the  femora  is  of  the 
same  color,  and  finally  that  the  pulvilli  are  of  a  pale-yellowish 
color,  of  all  which  there  is  no  trace  in  H.  pirata. 

3.  II.  parvus  Loew.  %  . — Olivaceo-aeneus,  thoraoe  et  scutello  cupreo 
resp'.endentibus,  abdomine  obscure  vire3oente,  femoribus  tibiisque  viridi- 
bus,  tarsis  nigris,  polline  faciei  opaoseex  fusco ochraceo, pleurarum  poUine 
albido,  veuis  alarum  ex  uigro  cinerascentium  nigris,  longitudiualibus 
tertia  et  quarts  perl'ecte  parallelid. 

Metallic  olive-brown,  thorax  and  scutellum  with  a  copper-colore''.  re- 
flection;  abdomen  dark-green,  femora  and  tibise  green,  tarsi  iilncV.  ♦i^; 
dust  upon  the  entirely  opaqut-  face  brownish  ochre-yellow,  that  on  the 
pleurie  whitish ;  the  wings  blackish-gray  with  black  veins,  the  third  and 
fourth  longitudinal  veins  entirely  parallel.  Long.  corp.  0.09 — 0.10. 
Long.  al.  0.13. 

Syn.  Ihjdrophorn>i  parvus  Loew,  Berl.  Entom.  Zeitschr.  VI,  214,  67. 

Resembles  in  the  structure  of  the  body  //.  pirata  very  much, 
but  sufficiently  distinct  from  it  by  its  smaller  size,  a  more  blackish 
color  of  the  wings  and  the  complete  parallel  course  of  the  third 
and  fourth  longitudinal  veins.  Face  with  brownish  ochre-yellow 
dust,  entirely  opaque,  very  much  narrower  upwards.  Paljji  black, 
antenme  also  black.  Front  almost  velvet-black,  with  yellow- 
brownish  dust,  which  is  not  distinctly  perceptible  in  every  direc- 
tion. Ground-color  of  the  occiput  green,  covered  above  with 
yellowish,  below  and  on  tlic  lateral  margin  with  wdiitish  dust. 
Cilia  of  the  upper  orbit  black,  of  the  inferior  one  white.  Upper 
side  of  the  thorax  metallic  olive-brown  with  almost  violet  and 
coppery  reflections,  the  latter  of  which  form  two  indistinct  longitu- 
dinal lines  and  are  more  extended  near  the  posterior  margin  of  the 
thorax.  Scutellum  shining  copper-colored,  with  four  bristles,  the 
lateral  bristles  much  shorter  than  those  which  are  nearer  to  the 
tip.  The  abdomen  is  green,  rather  opaque,  upon  the  middle 
somewhat  coppery,  on  the  lateral  margin  and  on  the  under  side 
distinctly  covered  with  white  dust ;  the  very  short  hair  upon  it  is 
black.  Coxa3,  femora  and  tibios  black-green.  The  fore  coxrn 
arc  fringed  on  their  front  side  with  very  delicate  whitish  hair 


■K' 


m 

-^-h 

tM^' 

t 

'''l".y'i' 

'tu'"' 

\ 

m 

ACIIALCIS, 


L>17 


which,  on  account  of  its  shortness,  is  difficult  to  iicrceivo ;  (in 
thoir  exterior  side  some  short  white  litth.'  liairs  are  also  inserted; 
one  of  the  uppermost,  however,  is  sometimes  of  a  lilaeU  coliM". 
The  fore  femora,  which  are  moderately  thickened  tcwivrds  the  root, 
have,  on  their  under  side,  a  dense  row  of  verj'  short,  straiji'ht, 
erect  little  bristles,  and  near  the  basis  two  or  three  longer  bristles. 
The  under  side  of  the  fore  tibise  is  also  provided  with  a  dense 
row  of  very  short  small  bristles.  Tarsi  black.  The  haltcres 
appear  to  be  black.  Wings  long,  tinged  with  a  gray-blackish 
color,  not  darker  towards  the  anterior  margin,  and  up  to  the  ex- 
treme root  with  black  veins  ;  the  end  of  the  fourth  longitudinal 
vein  is  completely  parallel  to  the  third  ;  the  posterior  transverse 
vein  is  perpendicular,  without  dark  margin  and  dark  spot  upon  its 
middle ;  the  convexity  crossed  by  the  last  segment  of  the  fourth 
longitudinal  vein  is  not  darker  than  its  surroundings. 
Uab.  reuusylvauia. 

Gen.  XXXVIII.     ACIIALCUS. 

Characters  Color  non-metallic.  The  first  joint  of  the  an- 
tcnnte  glabrous,  the  third  pointed-ovate ;  the  long  and  slender 
arista  subapical.  Face  narrow.  Alidonu'u  with  six  segments  in 
both  sexes ;  the  female  aljdomen  at  the  end  without  a  coronet  of 
bristles.  Ilypopygium  small  ;  its  exterior  appendages  have  the 
shape  of  small  lamelhe.  The  lirst  joint  of  the  hind  tarsi  without 
bristles,  shorter  than  the  second.  The  sixth  longitudinal  vein  of 
the  wings  is  wanting. 

It  is  impossible  to  overlook  the  relationship  of  the  genus 
Aclialcus  with  the  four  following  genera,  which  are  distinguished 
by  the  posterior  end  of  the  thoracic  dorsum  being  provided  with 
a  concave  area. 

This  relationship  is  also  illustrated  by  the  want  of  the  coronet  of 
bristles  on  the  posterior  end  of  the  female  abdomen,  which  Ac/iali-Uf^ 
has  in  common  with  these  four  geiu'ra.  1  have  only  a  few  speci- 
mens of  Afhalcufi  Jldficollifi  in  my  possession;  the  manner  in 
which  they  are  ))inned  renders  it  iinpossil)le  to  ascertain  whether 
the  posterior  end  of  the  upper  side  of  the  thorax  has  a  concave 
surface  or  not ;  it  seems  to  me  that  the  latter  is  the  case. 

The  name  of  the  genus  (from  a,  iion,  and  ;ta'^«05.  brass)  has  refer- 
ence to  the  nou-nietallic  color  of  the  species. 


■'  i; 


* 


ll 


lu^ 


t  -If  J!'?f>i,      1.5 


i;  ■■ 


;'':K^ 


^'    i':i^::!=- 


218 


DIPTKUA  OF  XollTir  AMERICA. 


[part  II. 


The  few  spi'cics  of  Avhalvua  as  yet  known,  '>elong  all  to  the 
European  fnuua. 

Gen.  XXXIX.     9IEDETERUS. 

Chnrncterb.  Face  of  both  sexes  rather  broad,  and  in  both  with 
a  transv(!rse  swellinu:  l)elow  its  middle.  The  jtroboseis  very  niueh 
swollen  ;  when  in  repose,  both  sides  of  its  ojjening  are  so  close 
tojrethi'r,  that  its  lower  surface  forms  but  a  sin«>-le  convexity.  The 
first  joint  of  the  antenna'  jilabrous,  the  third  rounded  or  scjmewhat 
ovate,  with  a  slender  apical  or  subapical  arista.  Eyes  not  hairy. 
The  upper  side  of  the  thorax  on  its  posterior  end  with  a  concave 
declivity.  The  hypopyjriuni  with  a  short  peduncle,  entirely  dis- 
en<j:a;.?ed,  inflected  under  the  venter,  with  rather  short  appendages. 
Feet  rather  long  and  slender,  almost  entirely  without  bristles  ;  the 
first  joint  of  the  hind  tarsi  without  bristles,  shorter  than  the  second. 
The  third  longitudiiud  vein,  in  most  of  these  species,  ends  not  far 
from  the  ti})  of  the  wing,  and  the  last  segment  of  the  fourth  longi- 
tudinal vein  converges  towards  the  third. 

The  genus  consists  of  two  groups;  the  first  of  these  differs  from 
the  secoud  by  the  shorter  distance  of  the  posterior  transverse  vein 
from  the  margin  of  the  wing,  by  a  stronger  convergency  of  the 
third  and  fourth  longitudinal  veins,  by  the  snuiller  length  of  the 
first  j<jint  of  the  hind  tarsi  and  a  more  slender  structure  of  the 
body. 

The  name  of  3Tcdetcri(/i  (from  n^iin^ioi,  neither  of  the  two)  was 
given  to  this  genus,  because  its  species  could  not  be  located  in  any 
of  the  two  genera  of  Jh)lii-/iopo(li(l/v,  established  at  that  time. 

The  known  species  belong  to  Europe,  Northern  Asia,  North- 
ern Africa,  and  North  Ameri(;a.  Of  the  latter  I  j^ossess  un- 
fortunately only  fragments  of  specimens,  so  luat  my  statements 
about  them  will  necessarily  be  very  imperfect. 

1.  1?I.  iiigl'ipt'^  LoEw.  9. — Nigricans,  antenuis  pedibusque  concolori- 
bus,  tlionicis  diinidio  aiiteriore  albido-bivittato,  diruidio  posteriore  et 
scntello  all)ido-pollinosis,  alis  subliyalinis. 

Blackisb,  anteiiniB  and  feet  of  tbe  same  color,  the  anterior  part  of  the 
thorax  with  two  wliitisti  strijies,  the  posterior  half  and  the  scutellnm 
covered  witlt  whitish  dust,  wings  rather  hyaline.  Long,  corp.  0.12. 
Long.  at.  0.12. 

Syx.  Mf'delents  Hf'yr/yxs  Loew,  Neue  Beitr.  VIII,  73,  1. 


I  i'ilF- 


MEPKTEHUS. 


219 


Blackish,  witliont  metallic  lustre.  Face  opaque  from  brown 
dust ;  its  ground-color  seems  to  be  greenish-black,  below  the  trans- 
verse swelling,  above  it  of  a  purer  black.  I'alpi  and  prol)oscis 
shining  black.  Antenna!  ])lack.  Front  opa(|ue  from  brown  dust. 
The  cilia  of  the  inferior  orbit  pale.  The  anterior  half  of  the  ui)por 
side  of  the  thorax  is  brown  with  dust  and  has  two  distinct,  yellow- 
ish-white longitudinal  stripes,  which  reach  from  the  anterior  mar- 
gin as  far  as  the  impression  upon  the  posterior  half;  this  impres- 
sion and  the  scutellum  are  covered  with  grayish-white  dust.  The 
ui)])er  part  of  the  pleurae  is  covered  with  brownish-gray  dust ;  the 
l)ristles  above  the  fore  coxa3  are  black.  Ab(h)meu  black  without 
any  distinct  trace  of  dust.  Coxie  and  feet  black ;  fore  coxse  very 
glabrous,  only  with  a  few  black  bristles  near  the  tij) ;  the  extreme 
tip  of  the  knees  dark  pitch-brown  (which  might  be  easily  over- 
looked). The  second  joint  of  the  himl  tarsi  is  three  times  the  length 
of  the  first  one.  Cilia  of  the  teguhu  whitish.  Ilalteres  whitish 
with  a  darker  peduncle.  Wings  hyaline,  scarcely  a  little  tinged 
with  gray,  with  dark-brown  veins  ;  the  i)osterior  transverse  vein 
distant  from  the  nuirgin  of  the  wing  somewhat  more  than  its  own 
length  ;  the  third  longitudinal  vein  ends  close  before  the  tip  of  the 
wing ;  the  last  segment  of  the  fourtii  longitudiiud  vein  is  uncom- 
monly straight  and  its  end  lies  close  to  the  end  of  the  third  longi- 
tudinal vein. 

Hah.  Middle  States.     (Osten-Sacken.) 


it. 


m- 


'till 


',M^-:- 


;**  • 


•I.:. 


t'\la 


ill 


i 


1"    ) 


2.  HI.  veles  Loew.  %  . — Nigricans,  antennis  concoloribus,  facie  opacd,, 
pedibus  testaceis,  femorum  diuiidio  basali  ex  nigro  piceo,  alis  subhyaliuis, 
maris  hypopygio  atro,  nitido,  ovato,  subsessili. 

Blackish,  aiitennre  of  tlie  same  color ;  face  opaque ;  feet  yellowish,  basal 
half  of  the  femora  brownish-black ;  wings  rather  hyaline,  hypopygium 
black,  ovate,  almost  sessile.     Long.  corp.  0.11.     Long.  al.  0.11. 

S?N.  Meileterus  veles  Loew,  Neue  Beitr.  VIII,  73,  2. 

Blackish,  without  metallic  lustre.  Face  opaque  from  brownish- 
gray  dust ;  its  ground-color  is  black,  more  distiiu-t  ujxm  the  part 
below  the  transverse  swelling,  the  dust  there  having  been  ruljbed 
otf.  Palpi  and  proboscis  l>lack,  shining.  Antenme  black.  Front 
opaque  from  brown-gray  dust.  The  upper  side  of  the  thorax  is 
marked  in  a  similar  manner  as  in  the  preceding  species,  l)ut  the 
dust  on  the  anterior  half  is  more  gray  and  that  on  the  posterior 
half  and  on  the  scutellum,  at  least  in  the  described  specimen,  less 


f 


II 


..■mUmhi-i 


220 


mPTEllA  OP  NOUTII  AMKRICA. 


[part  II. 


striking.  The  upper  part  of  the  pleiuje  is  covered  with  jrraydtist 
aud  the  bristles  ai)ove  the  fore  coxa;  are  of  a  pale  color.  The 
ahdoiuen  is  less  thickly  dusted  tluui  the  thorax,  appears  however 
rather  j^ray  in  some  directions  on  account  of  its  cover  of  dust. 
The  peduncle  of  the  hypopyg'ium  is  so  short  as  to  appear  ses- 
sile ;  it  is  rather  stout,  ovate,  almost  reversed-pyriforni,  hhick, 
polished  on  its  entire  right  side  and  on  the  latter  half  of  the  lefu 
side.  Coxie  black.  Feet  brownish-yellow,  all  femora,  from  the 
root  as  far  as  the  middle,  pitch-i  "k,  this  color  vanishing  gradu- 
ally. Cilia  of  the  teguhe  whitish  ;  halteres  whitish  with  a  darker 
peduncle.  Wings  hyaline,  scarcely  tinged  with  a  little  gray, 
veins  brownish  ;  the  posterior  transverse  vein  distant  from  the 
margin  of  the  wing  more  than  its  own  lengtli.  The  third  longi- 
tudinal vein  ends  a  little  farther  from  the  ti})  of  the  wing  than 
in  the  ])reccding  species ;  the  last  segment  of  the  fourth  longi- 
tudinal vein  is  also  very  straight,  converges,  however,  less  towards 
the  third  longitudinal  vein  than  in  31.  nUjripes. 

Hah.   Florida.     (Osten-Sacken.) 

Observation.  I  have  received  from  Mr.  Lc  Baron  two  females, 
captured  in  Illinois.  They  are  somewhat  larger  than  the  al)ove 
described  nmle,  and  the  lower  part  of  the  face  is  greenish-blue,  but 
very  little  .shining.  Otherwise  they  agree  with  it  perfectly.  The 
ditferent  color  of  the  lower  part  of  the  face  would  be  a  sufficient 
specific  distinction,  if  the  bad  condition  of  the  above  descril)ed 
male  of  M.  velcs  did  not  admit  the  supposition  that  the  diiferencc 
in  its  color  is  an  unnatural  one.  I  j)refer  therefore  not  to  consider 
these  females  as  belonging  to  a  ditterent  species. 

Gen.  XL.     CHRYSOTIINEUS. 

Characters.  Size  of  the  body  small.  Antenna?  small ;  their 
first  joint  glabrous ;  the  third  joint  very  short,  usually  broader 
than  long,  distinctly  hairy,  with  an  apical  or  almost  apical  arista. 
Eyes  with  a  very  short  pubescence.  The  posterior  end  of  the 
thorax  with  a  rather  large,  distinctly  concave,  sloping  area. 
The  bristles  upon  thorax  and  scutellum  yellow.  Abdomen  in  all 
the  species  partially  yellow.  Feet  not  elongated  ;  the  first  joint 
of  the  hind  tarsi  without  bristles.  Posterior  transverse  vein  up(m, 
or  more  or  less  before,  the  middle  of  the  wing ;  the  last  segment 
of  the  fourth  longitudinal  vein  neither  broken  nor  distinctly  bent 


\  Ll 


CIIRYSOTIMUS. 


221 


forward,  parallel  to  the  tliutl  vein  ami  endiiip:  into,  or  somewhat 
beyond,  the  tip  of  the  wiii^.     llypoinginm  small  and  imbeilded. 

The  species  of  Chri/mdimus  were  formerly  nailed  with  the 
species  of  Chrijsolus.  The  principal  dill'erenee  between  these 
genera  consists  iu  the  structure  of  the  thoracic  dorsum.  Cliri/- 
sotiis  has  immediately  before  the  scutellum  a  small,  more  or  less 
distinct,  transverse  swelling,  which  is  separated  from  the  rest  of 
the  surface  by  a  rounded  imi»ressioii,  and  the  convexity  of  the 
thorax  begins  here.  In  Chri/sotimufi  this  transverse  swelling  is 
entirely  wanting,  and  the  thorax  shows  iu  the  middle  of  its  hind- 
most part  a  rather  conspicuous,  distinctly  concave  surface,  slop- 
ing towards  its  posterior  margin.  Moreover  in  Chri/solinu(s  the 
feet  are  much  less  hairy,  the  wings  comparatively  a  little  larger, 
tiie  appendages  of  the  hypopygium  more  concealed,  the  integu- 
ments of  the  whole  body  softer,  the  bristles  upon  thorax  and  scu- 
tellum not  black,  but  yellow,  and  the  abdomen  always,  at  least 
partially,  of  a  yellow  color,  which  is  uot  the  case  with  any  of  the 
genuine  species  of  Chrysotus. 

The  name  of  the  genus  (from  X9'v96i  gold,  and  ti(iri,  honor)  re- 
minds us  of  the  coloring  of  the  species,  as  well  as  of  their  former 
connection  with  the  genus  ChnjaotKH. 

Besides  the  two  North  American  species,  described  below,  only 
European  species  are  known. 


w 


■Af.'    1 


Mil 


1.  C  pusio  LoEW.      9  • — LfPte  viridis,  abdominis  flavi  segmento  ultimo 
viridi,  anteunis  palpisque  nigris. 

Bright  green ;   abdomen  yellow,  tlie  last  segment  green ;   antennae  and 
palpi  black.     Long.  corp.  0.07.     Long.  al.  0.09. 

Syn.   Chrysotimns  pusio  LoEW,  Neue  Beitr.  VIII,  74,  1. 

Face  dark-green  with  a  thin  white-grayish  dust.  Palpi  brown- 
ish-black, appearing  rather  pale  on  account  of  a  white-grayish 
dust,  Antennaj  entirely  black  ;  front  shining  metallic-green  ;  the 
frontal  bristles  black,  in  another  direction  fallow-brownish,  with 
a  yellow  lustre.  The  cilia  of  the  whole  orbit  yellowish.  Thorax 
and  scutellum  pale  metallic-green,  with  whitish  dust,  but  shining 
and  fringed  with  yellow  bristles.  ^Nletatliorax  and  pleura;  of  the 
same  pale-green  color,  the  latter  with  thick  whitish  dust.  Abdo- 
men uniformly  yellow,  only  on  the  upper  side  of  tlie  last  segment 
green.     All  the  coxaj  and  feet  yellow,  only  the  last  joint  of  the 


'I'    .1 

i 

;  *  '      "      ■'        '  ■ 

■■ 

1 

i 

i 

'■^n 


ii*.' 


i  \ 


yt 


!      », 


000 


DIPTEIIA  (IF  NdRTH  AMEKICA. 


[PAllT  II 


tnrsi  ))ro\viiisli-bla('k  ;  all  the  liairs,  as  well  as  the  few  sliort  bristles 
upon  tlicm,  are  yeUowish,  th()U<^h  the  hitter  aiipear  dark  when 
hehl  towards  the  liglit.  Ilalteres  and  te^nihe  yeUowish,  the  hitter 
witli  yeUowish  ciUa,  Wiii<rs  hyaUne  witii  a  yeUow-grayish  tinge 
and  yelh)W  veins ;  the  short  and  steej)  posterior  transverse  vein 
lies  more  closely  to  the  axillary  ineision  than  to  the  tip  of  the 
wintr;  its  anterior  end  is  not  cpiite  so  far  distant  from  the  extreme 
basis  of  the  eosta  as  from  the  tip  of  the  wing. 
Hub.   New  York. 

S<  C.  delicatllH  Loew.      9- — li^to  viridis,  alxloininis    segmentis  se- 
cundo  et  tertio  fljivis,  iinteiniis  iiig"is,  palpis  flavis. 

Bright  green,  the  second  .and  third   abdominal  segments  yellow,  anteunse 
black;  palpi  yellow.     Long.    corp.  0.08.     Long.  al.  0.10. 

Syn.    Chri/sotiiiiHs  ileliciitiis  Lokw,  Neue  Beitr.  VIII,  74,  2. 

Face  blaekish-fjreen,  covered  with  white-frrayish,  not  very  strik- 
ing, dust.  Palpi  ])ale-yellowish.  Antenme  I)laek.  Front  metal- 
lic-green, indistinctly  covered  with  whitish  dust ;  frontal  bristles 
black,  in  another  direction  fallow-brownish  with  yellow  lustre, 
The  cilia  of  the  orbit  seem  to  be  altogether  yellow.  Thorax 
and  scutellum  pale  metallie-green,  with  gray-whitish  dust,  l)iit 
shining  and  fringed  with  yellow  bristles.  The  metathorax  and 
the  pleurae  have  a  similar,  but  more  dull,  coloring;  the  latter  are 
covered  with  white-grayish  dust.  The  first  and  the  two  last  ali- 
dominal  segments  are  green  and  shining,  the  second  and  third,  in 
fresh  specimens,  are  undoubtedly  of  a  yellow  color ;  in  the  oidy 
specimen,  which  I  possess,  both  are  infuscated  t.o  a  consideralile 
extent  at  their  basis  ;  ui)on  the  posterior  corners  they  show  a 
dusky-whitish  color.  The  color  of  the  venter  cannot  be  distinctly 
perceived,  but  it  seems  to  correspond  with  that  of  the  upper  side. 
Coxip  and  feet  yellow,  oidy  the  last  joint  of  the  tarsi  lirownish- 
black.  All  their  hairs,  as  also  their  bristles,  are  yellowish,  tlnuigh 
the  latter  appear  to  be  dark  when  held  towards  the  light.  11  nl- 
teres  and  tegula?  yellowish,  the  latter  with  yellowish  cilia.  Wings 
hyaline,  tinged  with  grayish  ;  towards  the  anterior  margin  with  a 
yellow-grayish  tinge  ;  the  veins  on  the  posterior  j^art  are  more  yel- 
low-brownish, on  the  anterior  part  more  yellow  ;  the  short  poste- 
rior transverse  vein  has  not  such  a  steep  position  as  in  the  pre- 


w 

w 

H 

"1 

m 

1 

/  • 

Vifr:.;- 


XANTiionir.oiifs. 


')•'"> 


ci'ding  species,  and  is  a  Utile  more  distant  from  the  tip  of  the 
wing. 

llab.   New  York. 


Gen.  XLI.     XAXTIIOC^IILORr^. 

Characters.  Color  of  the  body  non-metallic,  yellow,  often  with 
green  spots.  Antenna;  very  short  ;  their  lirst  joint  renuirkal)ly 
short  and  withont  hairs,  the  second  transvi'rse,  the  third  very  short ; 
the  arista,  which  is  diietinctly  clothed  with  hairs,  is  inserted  upon 
the  back  of  the  third  joint,  in  the  vicinity  of  the  basis.  The 
thorax  has  upon  its  posleri<tr  half  an  impressed  area,  which  is 
sloping  downwards.  The  last  segment  of  the  fourth  longitudinal 
vein  is  but  very  gently  inflected,  and  converges  somewhat  towards 
the  third  longitudinal  vein;  the  si.\th  longitndiiuil  vein  disappears 
already  far  before  the  nnirgin  of  the  wing.  Feet  rather  long; 
hind  tarsi  much  shorter  than  the  hind  tibiiu  ;  their  lirst  joint  with- 
out bristles  and  shorter  than  the  second.  Abdomen  of  the  male 
not  elongated  ;  the  hypopygium  rather  swollen,  not  imbedded, 
pointing  straight  liackwards,  so  that  the  abdonwu  thereby  apjH'ars 
to  be  somewhat  elongated;  the  appendages  are  small,  but  (li.-<- 
tinetly  visible.  The  abdomen  of  the  femah;  obtuse  at  tin  tip, 
somewhat  impressed  below,  and  without  a  coronet  of  bristles. 

In  consecpience  of  the  color  of  the  body,  the  species  o{'  Xaii/ho- 
chl'irioi  might  perhaps  be  mistaken  for  species  of  the  genera  ( 'hnj- 
solimux  and  Saiirrofus  In  C/iri/xolinuif^  the  position  of  the  arista 
is  more  subapical  ;  the  third  and  fourth  longitudinal  veins  are 
parallel,  the  feet  shorter,  and  the  hind  tarsi  almost  as  long  as  the 
hind  tibiic.  the  liypoi)ygi'.!m  of  the  nmle  is  sandier  and  imbedded, 
and  the  last  segment  of  the  fenuile  al)doineii  ])rotrudes  in  the  form 
of  a  short  ovipositor.  Of  all  this,  nolJiing  is  to  l)e  found  in  Xan- 
tJiochloriix.  In  Saitci'opus  the  alxlomen  is  elongated,  the  hypopy- 
gium iidlected  under  the  abdomen  and  the  last  alid(mnmil  segment 
of  the  feiiude  is  a  sort  of  an  ovi})ositor;  all  this  is  n(»t  to  be  found 
in  X(iiilliocIili)7'itt< :  the  feet  of  the  species  of  Saiicrojuiti  are  also 
much  more  elongated  than  those  of  the  species  of  X(nilIi()rhlorHs. 

The  name  of  this  genus  (from  Sai^oj,  yellow,  and  x^^i'oi,  green) 
has  reference  to  the  peculiar  color  of  the  species. 

Besides  a   few  European    siieeies,   only  the   following    North 


,    r. 


224 


T)II'TKUA  OK  NORTH  AMKIUCA. 


[part  II. 


American  sitocics  is  kiidwii,  w  liicli  may  jaTliaps  bo  iili-nliful  with 
one  of  the  Kuropeuii  speeies. 


1.  \.  Ii(>l villus   LoEw. 

iiiL;i'io.-iiitil)U.s. 


9. — riftvus,   fronto,  facio   et  setis    thoracis 


YtiUow,  fiont,  faco  ami  the  bristles  of  the  thorax  bhickish.     Long.  corp. 
(Ml.     Long.  al.  0. IM. 

Syn.  ^aiit/Kichloriin  lielfiiim  LoKW,  Noue  Ikltr.  VII,  75,  1. 

Altctfjctlier  yelh)\v.  FrDiit  and  faco  hiackisli  witli  whitisli  dust, 
winch  is  moro  distinctly  visiltlo  in  an  ()l»li(|no  direction.  Tlie 
arista,  the  bristles  on  tlie  vortex  and  on  tlie  upper  side  of  tlio 
tiiorax.  black,  lait  shifting?  into  lirown  in  a  rellcctcd  li^ht.  A 
snndl  l)lackisli  spot  en  the  pleunu,  immediately  below  the  root  of 
the  winj^. 

Jldh.  Chicago. 

Olm'rcatio)). — This  species  resembles  the Europoan  A',  frnrlhi)^ 
AVied.,  very  much,  and  Is  probalily  a  slijiht  variety  of  it.  Xo 
])histie  distinctions  at  all  are  to  be  seen  ;  the  only  dill'crencc  which 
I  can  perceive,  is  the  darker  color  of  the  l)ristles  upon  the  vtitix 
and  on  the  upper  side  of  the  thorax.  The  comparison  of  the  male 
is  necessary  in  order  to  determine  whether  this  species  can  be  con- 
sidered as  a  variety  of  X.  lenellus. 


I:    i  *i  ll'-'.;   ■'•    ■ 


t-' 

■  1.% 

i.' 


Gen.  XLIL     SAUCROPrS. 

The  species  of  this  gcnns,  which  older  authors  have  united  with 
Porphyropa,  agree  in  many  characters  so  much,  and  differ  by 
these  characters  so  sharply  from  the  related  s])oeies  of  the  Doli- 
chopodklfe,  that  their  claim  to  form  a  se))arate  genus  cannot  be 
questioned.  The  following  are  the  principal  characters  of  this 
gemiK  :  First  joint  of  the  antenna}  without  hair  on  the  upper  side  ; 
arista  dorsal.  The  thorax  with  a  sloping  area  upon  the  mid- 
dle of  its  posterior  end.  Feet  very  long  and  slender  ;  hind  tibiic 
elongated  ;  the  first  joint  of  the  hind  tarsi  without  bristles,  shorter 
than  the  second.  Abdomen  elongated  and  narrow ;  especially  in 
the  male.  Hypopygiuni  disengaged,  short  and  stout,  indoctod, 
with  short,  very  little  developed  appendages.  Color  of  the  body 
principally,  or  ut  least  partially,  yellow.  Kairs  and  bristles 
chiefly  black. 


s.Mri'.di'i'H.  2'2.i 

TIh'  cliiii'iii'tcrs  l»_v  wliirli  the  ;;'(iiiis  S(i iicrnpiis  is  flisliiifi'iiislicd 
IVdiii  llic  rclnU'd  jiTiici'ii,  nwA  iutt  lie  rcpcntctl  licrr,  it,-,  they  liiivc 
iilrcinly  lt(M'ii  sulli('ii'iitly  fxplaiiu'd  iiiiinn^'  tin'  cliiinirtcrs  dt'  tliuM' 
u  I'll  era. 

'I'lic  unww'iA'  J^inici'it/itii^  (from  navxiio,-,  (li-liciitt',  mnl  «'»r<.  \'nn\) 
liiis  rt  rfiTiUM'  to  the  HTciit  slciitlcriicss  of  llii-  H'l-I,  wliicli  (li>tiii. 
jiiiislics  nil  llir  s|H'CU's  ol'lliis  ^iciius. 

Tlic  kiiDUii  sjM'cics  lift' (listrilnit('(|  over  Jjii'dpc,  Aiiii'ri<'H,  iiiid 
Sdiitli  AlVica.  'I'lic  Aiiicricaii  s|M'ri('s  rcsciiildc  iiidrc  tlidsc  of 
I'lui-dltc  tliaii  tlidso  df  Sdiilli  Africa;  in  tiic  laltrr  llio  lliinl  and 
fdui'tii  !dn<:,-itiidinal  veins  an-  )iai'idl(  I.  while  in  the  I-]iii'd|ii'an 
sjieeies  the  last  sejrmenl  of  the  fdiirth  ldni:iliidinal  vein  a]»prdae!es 
the  third  Idnjiitudinul  vein,  allhuugh  vi'r\  gradually,  still,  in  gene- 
ral, very  strdngly. 

].  S.  (lilllidiatim  Lni-.w  ^. — P;illiil(<  tl.ivus,  tlinracis  liiuu  iiifdiii  ct 
inaculit  iKKstiiii  iiii/iis,  aliiloiaint)  iii>,'r(ita!-(.'ial<>,  setis  coxaruiu  auterimani 
alhiilis. 

I'alc-yt'llow.  tliorax  witli  a  Mnck  iiiiddln  line  aiiil  with  a  Mack  sjidt  apon 
tilt'  iiosteriiir  cnil,  aliiloint'ii  with  lilack  liaii'is  ;  tlic  anterior  cdXii'  witli 
whitisli  liristli'S.     Long.  <'ori>.  OA^,     Long.  at.  (•.17. 

pv.N.   Sinicriij)iiii  ilimiiliithis  Lim'.w,  Ncnc  Heitr.  VIM.  7.'),  1. 

Pale-yelldwish.  Face  very  naiTdw,  white.  Antenna'  bright- 
yelldw.  Front  black  with  white  dust  ;  frontal  bristles  lilack. 
(.'ilia  on  the  posterior  orliit  as  well  as  the  two  stronger  Ijristles 
liehind  tlie  upper  corners  of  the  eyes,  yellow-whitish.  Fjnier  side 
t)f  the  thorax  reddish-ycllow ;  th  middle  line  and  the  sloping 
area  oil  its  posterior  margin  are  i)lack.  Sciitelliim  wliitish-yellow 
with  two  strong  lilack  bristles;  on  the  outside  of  each  of  these 
lirislles  tliere  is  a  very  small  delicate  hair,  easily  overlooked,  which 
in  all  our  Fiiropeau  species  is  luuch  stronger.  Metatliora.x  black  ; 
the  pleura'  have  a  snudi  Iihick  dot  above  the  middle  coxse.  Abdo- 
men with  three  lilack  transverse  bands,  the  first  in  the  vicinity  of 
the  basis  of  the  second  segment,  the  two  following  near  the  basis 
of  the  third  and  fourth  segments;  the  two  last  are  somewhat 
emarginated  on  the  middle  df  their  jxisteridr  margin.  Jlypojiy- 
gium  short  and  clumsy,  shining  black  ;  its  small  (\xterior  appen- 
dages are  while.  Coxa-  and  feet  )iale-yclldwish  ;  on  the  fore  and 
middle  coxje  there  are  altogether  no  black,  but  only  whitish  liris- 
15 


U-'.i 


I 


: 


^ 


00( 


rtll'TKHA   (IF   NdllTll   AMl.lMl'A. 


[ 


I'Aiir  11. 


llt's  ;  tlif  liiiirs  dii  tlic  IVunt  side  of  tlic  lure  cuxii'  arc  iilsd  wluti>li  ; 
(III  \hv  (Hit>i(l('  of  tlic  hind  coxiu  tlicfc  is  a  .solitary  It'luck  l)^i^li(', 
Tiltiu"  and  tarsi  t'loii^iilcd  and  vcrv  slender;  middle  and  liiiid  tarsi 
stronj^ly  inriiscated  I'roni  tlie  tip  of  the  first  Joint;  the  fore  tarsi 
from  till'  tip  of  tlie  lirst  joint  hecoine  likewise  more  dark,  though 
their  color  changes  much  more  fi-radually  into  lirown.  Cilia  of  the 
teji'iilii'  whitish.  Win;ji:s  hyaline  with  a  sliji'lit  }i'ray-yellowish  tiiiu'e  ; 
the  end  of  the  fourth  lunj^iludinal  vein  approaciies  rather  strongly 
tlie  end  of  the  third. 

Jl(il).   Florida,  Uistriet  of  Columbia.     (Osteii-Saekeii.) 


*2,  H.  riltielllis  Lokw,      9.— P.-illi.le   tl.ivna,  thoracis  iiiaful4  pcistlc-i, 
iibildiiiinis  tiisuii.s  st^tis(iue  coxitiuiii  niuiis. 

Pal(j-yt'll()W  ;  therax  witli  n   Mack  sjiot   iiikhi  tli(*  posterior  siile  ;  aliilotneu 


with  Ithick  bands;  uoxie  witli  lilatk   luistles 
al.  Ii.t23. 


I.on 


rj).  U.2ri.     Li 


Sy.n. 


•iaiicriijiw 


riihrlhis  Lokw,  Neue  Beitr.  VIIL  7<i,  2. 


I'al 


e-vellowisii. 


ace  narrow,  white 


Ant 


eiiiiic  oriy 


low. 


Front  lilack  with  white-yellowish  dust.      MMie  IVoiital  li,  and 

the  two  stronger  bristles  hehiiid  the  ui)per  corners  of  the  eves, 
liinck.  Cilia  of  the  orliit  yellowish-white.  Upper  side  of  tin.; 
thora.x  reddish-yellow,  the  slo)>ing  an>a  on  its  hind  margin  lilack. 
Sciitelliim  yellowish  with  two  sli'oiig  black  liristles  ;  on  the  outside 
of  each  there  is  a  very  niiiinte  delicate  hair,  easily  overlooked. 
Metatliorax  brown  only  on  the  upper  margin  and  upon  the  mid- 
dle line.  Pleura'  witli  a  lilack  dot  above  the  middle  eo.xa'.  Al»- 
domeii  wilh  four  black  transverse  bands  of  uniform  breadth,  of 
which  tlie  lirst  near  the  anterior  margin  of  tlio  second  segment, 
llie  others  on  the  anterior  nuirgiiis  of  tlie  following  segments;  the 
last  of  these  bands  is  sometimes  indistinct.  Coxa;  and  feet  pale- 
yollowish.  The  bristles  on  the  fore  coxa'  black  ;  the  hair  011  the 
front  side  blackish,  towards  the  liasis  of  the  coxie  pale  ;  middle 
coxa'  with  black  bristles  and  hairs  :  the  hind  coxa»  on  their  out- 
side with  a  single  lilack  bristle.  Tibiu'  and  tarsi  elongated,  very 
,sleiidcr ;  the  tarsi  from  the  ti[>  of  t!ie  lirst  joint  infuscated.  The 
cilia  of  the  tegula'  yellowish.  AViiigs  with  a  very  distinct  gray- 
yellow  tinge  ;  the  end  of  the  fourth  longitudiiial  vein  rather  strtnigly 
api»roaches  the  end  of  the  third  one. 
JJab.    Virginia.     (Osteii-.'-iackeii. ) 


rmv 


SAI  iltiil'l  S. 


4>.) 


-'7 


3.  H.  siigiprltirilH  ].<>r.w.      %  and    9.  — Kx   planro    vlrMis,  nliilomii).) 
lii'li"  it'iifd  ,  iriili,  lii^iiii  vt'isim  lljivn. 

(irayisli-gn't'ii,    tin-    aliiliiiiifii    s-liininc  inctallii'-^'rffii,  tovvanls    tlm    lia^is 
yellow.     liOii),'.  imp.  (M;;—n. 14.     |,c.iiu'.  al.  iM.'i. 

f^v.N.   Siiiiirii/ius  si(})i  rliints  Lmiw,  NtMic  I'-fitr.  VIII,  7t!,  IJ. 

Fare  of  llic  intilo  t'litircly  linciir;  llmt  uf  tlic  I'ciiiiilc  iilsn  very 
narrow,  smnv-wliitc.  I'ulpi  and  iiroboscisdark-ycllnw.  Anirmiii! 
brij!;lit  r('<l(lisli-yi'll(»w  ;  tlic  siiiiill  third  joint  soincwlint  inriisciitcd 
at  the  lip.  Frr)nt  witli  thick  wliitisli  dust;  the  IVontuI  Itristlcs 
bhick.  The  <'iliii  of  tlic  iippci"  orbit  black,  those  of  the  iiilcral 
uiid  inferior  orbits  wliitish.  The  upper  side  of  the  thorax  lias  a 
pale,  inetallic-jirecM  ^^round-color,  more  copper-colored  townrds 
the  sides,  appears,  however,  on  account  of  the  thick  ffray-whitish 
dust,  opaipio  and  frhiueous.  Scutelluni  more  Idue-jfreen,  but  al>o 
rather  thickly  covered  with  j:'ray-whilisii  dust  ;  it  has  two  stroni^ 
l)lack  bristles.  'I'he  pleura",  wliicii  are  covered  witli  thick  white 
dust,  Iiave  a  grayish-jjreen  <i-r(Hiii(|-co|or,  only  their  posterior  mar- 
gin (cjiimera  iiu'tnlhonti-is)  is  of  a  yellow  color.  Abd(»men  some- 
what less  eloiifrated  tlian  in  the  ]»rccedinir  species;  its  first  sc^-. 
ment  yollow,  usually  witli  a  blackish  spot  on  each  side,  wlii(  li 
e.\i)ands  more  in  some  specimens,  so  that  llie  u'reater  portion  of 
tiiis  segment  is  of  a  lihickish  color  ;  the  second  sciiineiit  is  also 
yellow,  lias  however  on  each  side  a  hiru'c,  brij:lit,  nictallic-fi-reeu 
spot,  which  reaches  from  the  jiostcrior  almost  to  the  anterior  mar- 
gin and  not  u!ifre(|ueiitly  comes  in  contact  with  the  opposite  spot 
and  forms  a  complete  Itand,  so  that  the  antei'ior  margin  of  this 
segment  alone  remains  yellow.  The  following  segments  are  on 
their  whole  upper  side  of  a  very  saturate  tnetallic-grecn  coloring 
and  very  shining;  towards  the  lateral  margin  the  color  <iften 
changes  more  into  gold-green,  rarely  into  coppery.  \'eiit('r  yel- 
low. The  small  rotinded  hy]M)])ygium  of  the  male  yellow.  All 
the  coxu^  and  the  long  slender  feet  pale-yellow  ;  the  stronger  hairs 
and  bristles  on  the  fore  <'oXie  are  fallowish-yellow  in  the  males, 
black-ljrown  in  the  fenndes  ;  the  more  delicate  hairs  are  pale-yel- 
lowish in  both  sexes.  Tibia'  and  tarsi  very  elongated,  especially 
the  fore  and  middle  tarsi  of  the  male,  t!ie  first  .joint  of  which  is 
almost  as  long  as  the  tiliia^  and  considerably  longer  than  the  four 
following  joints  together;  in  the  fennde,  however,  the  fore  and 
middle  tarsi  are  less  elyiigated,  especially  their  first  joint,  thongli 


i 


^:,, 


•  t 


>;    J 


liiS 


'^''' 

■  ■f? 

,^ 

9-     ■•":■:■,'';'■    ■ 

..■»^-"— 

•     ri-/^A 

1  '-m-/ 

(.'  "  ■■'■ 

t               t 

>i 

i 

4; 

228 


DIPTFRA  OF  XORTII  AMERICA. 


[I'AUT  H, 


they  oxpocfl  tlio  tibia?  m  length  not  inconsiderably;  the  hind  tarsi 
are  but  a  little  l()ii<j:('r  than  the  til)i;e,  their  lirst  joint  not  miieh 
longer  than  the  second.  The  tiidie  iin<l  tarsi  of  the  hiud  feet  are 
sparsely  beset  with  very  short  bristles,  which,  in  the  fenuile,  dis- 
tinctly d'Her  from  the  usual  short  hairs,  in  the  inale  however 
scarcely  exhibit  any  diflerence.  The  cilia  of  the  whitish  teguUe 
ajipear  in  some  directions  dark-brown,  in  others  shift  into  yellow- 
ish. Wings  hyaline,  little  tinged  with  grayish;  the  veins  bi'own- 
ish  ;  the  long  last  segment  of  the  fourth  longitudinal  vein  is' gently 
inflected  forward  and  cuds  rather  closely  near  the  cud  of  the  third 
longitudinal  vein. 

Hab.  Florida.     (Ostcn-Sackeu.) 

4.  S.  tenuis,  nov.  ■'p.  9  • — iJibite  flavescens,  fronte,  thoracis  dorso 
prreter  liml)OM  laterale.s  pcatellocjue  pneter  niarginem  ex  cincivo  viivs- 
centibus,  pleurarum  diniidio  snperiore  (-t  metanoto  ex  glauco  ciiieieis, 
fasciis  basalibus  s«>gmentorum  abdoniinalium  nigris. 

Pale-yellowish,  the  front,  the  back  of  the  thorax,  with  the  exception  of  the 
lateral  margins,  and  the  sciitelUini  with  the  exception  of  its  ni;.:gin, 
gray-greenish  ;  the  upper  half  of  the  plenrae  and  the  metathorax  ereen- 
ish-gray ;  al)doniinal  see?  .ents  at  the  basis  with  black  bauds.  Long. 
Corp.  0.13.     Long,  al-  0.1   . 

Pale-yellowish ;  the  face,  very  narrow  for  a  female,  and  the 
palpi  have  the  same  color  ;  both  are  somewhat  covered  with  whitish 
(lust.  iVntennire  pale-yellowish,  the  third  joint  somewhat  infus- 
catcd.  The  ground-color  of  the  front  is  greenish,  metallic  but 
not  shining,  covered  with  rather  thick  white  dust,  so  that  the 
■whole  front  assumes  a  pale  grayish-green  appearance.  The 
greater  part  of  the  ui)per  side  of  the  thorax  has  a  similar,  but 
somewhat  more  green  coloring ;  however,  the  humeral  region,  and 
in  connection  with  it,  a  large  lateral  spot  near  the  transverse 
suture,  the  lateral  margin  above  the  root  of  the  wing  and  the 
posterior  corners  are  of  a  yellowish  color.  Scutellum  grayish- 
green  with  yellowish  nmrgiu.  Almost  the  whole  upper  half  of 
the  plcuric  is  greeni:di-gra\,  yet  tlie  color  of  the  described  speci- 
men IS  not  sufliciently  matured  for  a  more  i)rccise  statement  about 
the  e.\tcnt  of  this  color  ;  the  metathorax  is  gray.  The  first  al)- 
dominal  segment  is  blackish  at  its  basis  ;  the  three  following 
segments  have  each  on  the  anterior  margin  a  broad,  black  baud, 
which  is  gradually  tapering  towards  the  lateral  margin.     Feet 


I'siLoins. 


2'20 


palo-yi'llow  ;  tavsi  tDwai'ds  tlie  tip  only  vory  little  dnrkor.  but  their 
small  last  joint  more  of  less  distinetly  infuseated,  esi)eeially  that  of 
the  fore  tarsi.  Cilia  of  the  te-rnhe  whitish,  llalteres  white-yel- 
lowish ;  their  kiiol)  infuseated  on  its  lower  half.  Win<i's  hyaline, 
only  a  little  tinu'ed  with  n-rayish  ;  the  last  seti'nieiit  of  the  fourth 
longitudinal  vein  is  only  very  ucntly  inlleeted  forward  from  its 
middle,  is  in  <j:eneral  somewhat,  distant  frum  the  third  longitudinal 
vein,  and  approaehes  it,  esjieeially  at  its  end,  le.ss  closely  than  is 
the  ease  in  the  ]»reeediiig  hpeeies. 
IlaO.   Middle  iStiites. 

Gen.  XLin.     PSILOPl'S. 

The  crenns  r.<ilopt(!<  ean  be  easily  distinti'uished  from  the  re- 
lated g-enera  by  its  jieeuliar  slender  structure,  the  slenderness  of 
its  feet,  the  broad  and  e.xeavated  vertex  and  the  peculiar  neuralion 
of  its  winji's.  The  ))eculiarity  of  the  neuralion  consists,  besides  tht! 
great  i»roximity  of  the  p(jsterior  transverse  vein  to  the  inarg-in  of 
the  wiuiT,  es])ecially  in  the  structure  of  the  fourth  lonj;itudinal 
vein;  this  vein  either  d(jes  not  reach  the  margin  of  the  wing  at 
all,  or  becomes  extremelv  thin  liefore  it  reaches  it  ;  at  the  same 
time  it  emits  anteriorly  a  robust  branch,  which  bends  forward 
either  in  a  smooth  or  in  an  angular  curve  ami  ends  in  the  neigh- 
borhood of  the  third  longitudinal  vein  into  the  margin  of  the 
wing;  strictly  speaking,  this  anterior  'iranch  is  the  real  continua- 
tion of  the  fourth  longitudinal  vein;  its  apparent  continuation 
Ijeyond  the  origin  of  this  Ijranch  is  an  adventitious  apitendage  ; 
and  that  such  is  really  the  case,  is  ]>roved  by  those  exotic  si)ecies, 
where  this  ap[)eudage  is  entirely  wanting. 

The  species  of  J'Kilojiiifi  exhibit  in  the  structure  of  the  head 
and  of  its  i)arts,  es|)ecially  in  the  anteniue,  as  also  in  the  structure 
of  the  feet,  of  the  wings,  and  of  the  male  organs  of  co})ulation, 
numerous  plastic  diU'ereiiccs,  which  may  easily  mislead  to  the  for- 
mation <'f  snndler  genera.  The  greater  ])arl  of  these  characters  are 
merely  ornaments  of  the  males  and  exclusively  specific  distinctions, 
so  as  to  l)e  of  little  use  I'iir  the  delinition  of  smaller  genera  ;  this 
apjilies  even  to  the  most  striking  among  the  other  characters,  as, 
fi)r  ii'staucc,  to  the  e.'ilii'r  dorsal  or  apical  position  of  the  arista, 
the  either  very  s!'i)rt  or  very  long  iiulteseence  of  the  second  Joint 
of  the  antenmu  ^v.  ;   lliese  also  all'urd  no  sharp  limits,  and  there 


'i^M 


.1; 


•  \|v^ 


i'': 


■■■■,■(.' 


■(.  t 


,      ■: 


I '    -.1 

,1 !     > 


i!:s 


•     !/     •H.jt.- 


'■■■n^y. 


i:iO 


DIPTKUA  OF  NOUTII  AMKllICA. 


[part  U. 


are  species,  whoro  the  two  sexes  do  not  ajj-ree  in  tliose  eliuraeters. 
Mr.  l)i<i'()t  divided  tlie  genus  P.^ilojnia  into  the  fnllowing-  twelve 
sniuller  genera  :  JIc(jif<lvf<lijluf!.  Mesuhlepltarua,  A(jonosoinu,  Mar- 
(jarilvfilijlus,  Oarit<lijtiis,  Vundijlotilijl an,  J'Juro.f/ona'rus,  y'o.sw/y/.</- 
lojiux,  JIi'tcrujt^ilopUH,  FxiltipuK,  SciajiUff,  and  CLdijxiilujnift.  In 
aceordanee  with  what  1  have  said  above,  1  cannot  adopt  these 
genera,  based  in  part  upon  dillerences  in  the  orntiinentation  oftlie 
feet  in  the  male,  and  upon  otlier  distinctions  of  a  similar  value. 
If  the  genus  I^silojiux  is  to  be  furtlu'r  subdivided,  this  divisi<tn 
will  have  to  be  based  ujion  the  observation,  that  tlu;  species  of 
l^fiilojiiiff  diverge  in  two  directions  in  their  general  habitus;  one 
of  these  two  sections  end)raees  all  otir  European  sj)ecies,  and  a 
number  of  similar  species,  nujstly  from  Norihern  Asia  and  North 
America,  the  other  section  includes  the  large  majority  of  the  e.xtra- 
Kiiropean  species.  If  these  two  branches  are  to  l)e  raised  to  in- 
dependent genera,  then  such  characters  must  be  found,  which  can 
distinctly  separate  then»  from  each  other.  There  i.s  m>  want  of 
plastic  distinctions,  winch  may  be  used  for  such  a  purpose,  but 
they  are  so  manifold  and  of  such  an  intricate  nature  that  I  believe 
to  have  found  a  more  useful  nunk  of  distinction  in  the  color  of  the 
cilia  of  the  teguhe,  which  in  all  the  species  of  the  first  branch 
known  to  me  are  whitish,  in  those  of  the  second  branch  however 
black.  These  characters  have  been  used  by  me  merely  for  the 
establishment  of  the  two  subsections  of  the  genus  Pxilopm^. 

Although  the  species  of  Pxi/opn,^  are  so  numerous  and  appa- 
rently resendjie  each  otlier  so  much,  nevertheless  they  can  be 
easily  distinguished,  if  only  the  necessary  attention  is  paid  to  the 
])lastic  difl'erences  and  not  nierely  to  the  diff'erences  in  color, 
which  are  often  insignillcant  and  more  or  less  inconstant  in  ahnost 
all  the  spooies.  The  nniles  of  the  diflerent  species  especially  can 
be  easily  distinguished,  as  they  are  remarkable  by  peculiarities 
in  the  structure  of  their  antenna',  wings  and  feet,  which  belong  to 
their  se.\  only  ;  they  offer,  besides,  usefid  marks  of  distinction  in  the 
anal  appendages  ;  among  the  fenndes  of  the  smaller  species,  how- 
ever, the  distinction  becomes  sometimes  rather  diflicult.  Of  the 
characters  taken  from  the  cohiring,  the  most,  unrelialile  are  those 
taken  from  the  coloring  of  the  head,  thora.x,  and  alMlomen,  espe- 
cially in  those  species,  the  metallic  coloring  of  which  is  shifting- 
between  the  bine  and  the  green  ;  a  little  nn)re  available  are  tli(? 
characters  bused  upon  the  picture  of  the  wings,  if  only  we  do  not 


^<§^; 


^■WP^Wifi^^nB^"'    '    F"*'*^*  ■•- 


rsii.oiM  s. 


231 


neglect  to  observe  that  this  ])!eture,  at  least  in  ninny  species, 
varies  a  great  deal  not  only  in  intensity,  bnl  also  in  extent  ;  nse- 
fiil  and  rather  reliai)le  are  the  characters  based  npon  the  coloring 
of  the  feet,  bnt  of  course  then  only,  when  the  sex  is  stated,  as  in  a 
good  many  species  the  leet  of  the  remalos  are  much  paler  than 
those  of  the  nniles. 

The  genus  derives  its  name  (from  41X05,  slender,  and  noii.  foot) 
from  the  great  slenderness  of  the  feet,  peculiar  to  all  the  species. 

The  species  of  J'silujui.i  are  numerously  represented  in  all  jtarts 
of  the  world. 

Huy  has  described  several  North  American  species  of  Puilopns. 
"Wiedemann  has  adiled  a  few  nnjre.  His  descriptions,  even  if 
judged  with  leniencv,  will  be  fouiul  verv  nnsatisfactorv,  as  thev 
relate  merely  to  diU'orences  In  color,  and  often  do  not  even  state 
to  what  se.\  the  s)»ecinien  belonged;  some  of  them  can  be  applied 
to  whole  series  of  closely  allied  species.  Mr.  .Mac(iuarl's  anil  Mr. 
Walker's  descriptions  are  not  much  Itet.ei  ;  those  especially  which 
the  hitter  published  in  the  Diplera  Suiitidcn<i<tiia  are  remarkable 
for  their  entire  uselessness,  so  far  that  one  may  be  .sure  not  t(i  find 
in  them  precisely  those  data  which  are  indi>peiisal)le  fi>r  the  re- 
cognition of  the  species  of  Psilopus  and  for  their  di.-5tinction  from 
each  other. 

The  insufficiency  of  the  existing  de.scri|»tions  renders  the  ileter- 
miiuition  of  the  species  very  dillicult ;  generally  we  reach  oidy 
possibilities,  sometimes  probabilities,  very  .seldom  certainly.  As 
I  am  able  to  identify  oidy  a  snnill  number  of  my  species  with 
those  which  have  been  des(M'ii)ed  before,  I  deem  it  necessary  to 
give  here  the  results  obtained  from  the  comparison  of  the  species 
in  my  possession  with  the  descriptions  of  the  jtrevious  authors, 
and  for  this  purpose  I  shall  eiuimerate  these  descriptiiiiis  one 
after  the  other. 

The  species  heretofore  published  are  the  follow'i>g: — 


If,..,, 


li  ■■;" 


'5  •■ . 


I; 

■     f     \ 


l     4;: 


1.  longicornis  Fnhr.  Irnliponous  to  the  .Aniorioan  i  .lands  ;  it  has  been 
rles(:ril)eii  hy  Faliriciiis,  ainl  afterwai'ils  ai.'aj:.  liy  Wii^iU'iiianii,  from 
a  spcciiiit'ii  ill  tliH  colhMUioii  of  l'iii)ri(:ius  ;  the  sex  was  not  stateil, 
hut  I'"alirifiii  .'s  exj)i'ession  '^nniilii  iinriii'itn."  sl^iw^i  tiiat  it  was  a 
male  :  ill  til,.  (li-MTiptioii  (if  Wii'ij.Miiaiin  tin'  lulhiwiiii:  avaiialile  clia- 
racters  r.re  fouiul  :  tlie  fac-e  only  little  dusted  with  white,  tin'  hasis 
of  the  ahdoiiiiii.'ti  seuiiients  hla(rk,  wiiitrs  without  dark  |i:cturi',  li.J 
teres  yellow,  fuel  black,  fore  tibia?  luluoua.     These  charaulens  agreo 


.1 


)-'V 


"i  mi 


r  1- 


Vim 
Mi 


J, 


"♦1 


PIPTKUA  OF  NORTH  AMKRICA. 


[I'Airr  It. 


tolernMy  well  with  tlu'  two  sexes  of  a  speoies  from  Cuba,  desfrihcil 
lielow  as  /'.  iliri/^ojinisiii-i,  alllnm!.'h  the  tart!  of  the  male  of  this  s]it'- 
fies  is  distinctly  covered  with  dii>t  and  the  lialleres  are  lilai'ki.-U 
with  a  dark  yellowish-gray  knob,  lint  it  evidently  results  fiom  the 
statements  of  Fabrieius,  that  his  /'.  huKiivoniix  belongs  to  those  sjie- 
eies,  the  arista  of  whitdi  is  very  elongated  and  but  little  shorter  than 
the  rest  of  the  body.  In  /'.  cliri/sd/irdsinK,  on  the  coutrary,  the  arista 
is  not  even  as  long  as  head  and  thorax  together.  Thus  the  latter 
species  must  be  considered  distinct  from  that  of  Fabricius,  as  long 
as  their  identity  has  not  been  proved  by  the  comparison  of  typical 
specimens.  In  Winthem's  collection  there  is  a  male  specimen, 
marked  /'.  loiKjicurnis,  and  designated  as  Wiedemann's  tyjie  ;  it  is 
7*.  (7i(v/.so;(;v(,s//(,s-.  As  Wiedemann,  in  the  description  of  /'.  lom/i- 
rornis,  refers  only  to  the  specimen  from  the  collection  of  Fabricius, 
it  is  eviilent  that  Winthem's  specimen  came  only  later  in  the  jios- 
session  of  Wiedemann,  and  was  i)robably  named  by  him  /',  lniKji- 
cornis,  after  comparison  with  his  own  descrijition.  This  is  no  proof 
at  all  of  the  identity  of  the  genuine  /'.  hini/ifoniis  Fabr.  with  /*. 
chn/soiii-(isii(s.  The  specimen  in  the  collection  of  Fabricius  can  alone 
afford  light  upon  this  subject. 

2.  sipho  Sii;/.     The  frequent  occurrence   of  tlio  species  described  below 

under  tins  name,  and  the  characters  which  result  from  a  compari- 
son of  Say's  and  Wiedemann's  descrij>tions,  leave  ine  no  doubt 
about  the  correctness  of  my  determination.  That  Say  did  not  dis- 
tinguish it  from  /'.  scdlxr,  a  very  closely  related,  but  more  rare 
species,  results  from  the  fact  that  there  are  two  speciiuens  in  Wiede- 
mann's collection,  namely,  a  male  of  P.  scalier,  and  another  of  /'. 
sijilin,  both  communicated  under  tlie  latter  name  by  Say  himself. 
The  name  which  Say  has  given  belongs  naturally  to  the  common 
species.  The  species  whicli  Macquart  (in  Difit.  ejot.  II,  '1,  Hi)) 
described  as  P.  si/ilio,  is  an  entirely  dill'erent  species,  probably  the 
one  whidi  I  described  below  as  P.  JhcuikIiis,  from  Cuba;  however, 
it  may  also  represent  a  mixture  of  several  species,  as  the  localities 
of  its  occurrence  (l^euusylvania,  Cuba,  (tuyana  and  Brazil)  seem  to 
indicate. 

3.  unifasciatus  ■'^'t;/.     Say  describes  this  species  without  stating  tlie  sex, 

Wiedemann  as  P  Sni/i,  after  a  male  specimen,  obtained  from  Say. 
As  there  is  no  sufficient  ground  for  the  change  in  the  name  of  the 
species,  introduced  by  Wiedemann,  the  name  given  by  Say  must  be 
restored.  'J'his  species  cert'dnly  belongs  to  tliose  with  pale-colored 
cilia  of  the  tegnlje.  I  know  tliree  North  American  species  wbich 
answer  more  or  less  Say's  description  with  regard  to  the  color  of  the 
body ;  in  all  three  only  the  tirst  joints  of  the  antennje  are  yellowish, 
the  third  joint,  liowever,  brown  ;  thus  all  three  could  not  lie  iden- 
tified with  P.  iini/'dsriiitun  Say,  if  his  statement,  ^^nntenntK  irhili-lt,'''' 
were  to  be  taken  literally,  which  certainly  oui^ht  not  to  be  done. 


<  IP  ■:.  • 


psiLor-rs. 


2.'!;J 


The  first  of  my  three  species  is  described  below  as  P.  psiihiviina ; 
the  male  is  remarkable  by  a  very  uncommon  structure  of  tlie  wio'^'s  ; 
as  Wiedemann's  descrijition  of  the  male  says  nothing  aliout  such  a 
structure  ;  umreover,  as  neither  the  dust  upon  the  face,  nor  tin-  color 
of  the  first  abdominal  segment,  nor  that  of  tlie  feet  agrees  with  the 
male  of  P.  jisilldi-iiiKs,  it  is  therefore  impossible  to  identify  it  witli 
Say's  species.  Of  /'.  hholor,  described  below,  and  distinguisbi-d  by 
its  slender  tarsi,  I  know  only  the  female;  it  is  very  nnuh  smaller 
than  /'.  inii/dsciiiliis  slionld  be,  according  to  Say's  and  Wiedemann's 
statements;  moreover,  the  wings  are  not  light-yellowisl;,  tlieir  veins, 
liowever,  daik-brown,  tlie  face  covered  with  more  dust,  and  the  tarsi 
mnch  paler  than  they  sliould  be  in  the  species  of  Say  ;  tiierefore 
both  cannot  be  taken  for  one  and  the  same.  The  third  of  my  spe- 
cies, P.  varicijatus,  of  wliich,  however,  I  possess  also  only  the  female, 
has  tarsi  of  a  darker  color  than  the  two  pieceding  species,  though 
tlie  fore  tarsi  are  not  altogether  and  the  liind  tarsi  not  only  at  the 
tip,  black-brownish ;  on  the  contrary,  the  fore  and  middle  tarsi  are 
blackish  from  the  extreme  tip  of  the  first  joint,  the  bind  tarsi,  liow- 
ever, entirely  blackish  with  the  only  exception  of  tlu;  root  of  the 
first  joint;  moreover,  tlie  face  is  very  tliickly  covered  with  dust,  the 
color  of  the  wings  not  yellowish,  and  tlie  color  of  the  veins  of  the 
wings  not  dark-brown,  so  tliat  it  would  be  entirely  inadmis-iible  to 
declare  this  species  for  P.  uni/nsria/iin  of  Say,  which  therefore  can- 
not be  found  among  tbt;  species  known  to  me.  Neither  is  tliere  any 
inform.ation  about  it  to  be  derived  from  Wiedemann-Winthem's 
collection;  there  is  no  specimen  in  it  which  bears  such  a  name,  nor 
is  there  ^ny  other  to  which  the  description  of  P.  uiii/asciatus  might 
apply. 

4.  patibulatus  Say.     Say's  description  agrees  well  with  a  species  wliich 

is  very  common  in  North  America,  similar  to  s////io,  but  with  black 
feet  and  smaller;  it  is  described  .lelow  more  in  detail  un<ler  Say's 
name.  Wiedemann's  description  is  but  a  translation  of  Say's  de- 
scription of  this  species,  which  he  seems  not  to  have  possessed  liim- 
self. 

5.  femorat;uB  Say.     Judging  from  Say's  description  we  refer  this  species 

into  the  circle  of  relationship  of  /'.  scohiiidtnr,  cnlcaratus,  kc.  That 
this  is  correct,  is  confirmed  by  a  statement  of  Say,  which  otherwise 
would  have  been  ratlier  striking.  While  he  describes  (Jmirn.  Acml. 
Philad.  Ill,  Bt!,  f))  the  femora  as  green,  and,  with  the  exception  of 
the  hind  ones,  provided  with  a  pale  tip,  he  sjieaks  (1.  c.  VI,  l(i8, 
11)  of  one  specimen  with  entirely  pale  femora.  Now  the  males  of 
all  the  species,  which  belong  to  the  above-mentioned  group,  have 
the  femora  of  precisely  the  same  color  as  Say  first  descibed  them, 
while  the  females  have  entirely  pale  femora.  The  sf/ecies,  which 
belong  here,  are  distinguished  in  the  male  sex  by  sorn  •  jieculiarities 
in  the  structure  of  the  feet ;  as  Say's  description  does  '>ot  mention 


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ii 


234 


DIPTEHA  OF  N'ttRTII  AINIF.RICA. 


[PAUT  II. 


tlu'in,  it  is  impoHsilde  to  determine  which  of  the  compptiiii,' spHcies  ho 
li;i(l  1)1- lore  him.  Wii'deiaanu'.s  tie.-iuriptionufthuMiiiiie  species  ull'ord.s 
no  liglit  ;  lie  does  not  ;tate  tlie  sex  of  tlie  described  speeiiiieii,  hut  it 
is  evident  from  his  statemenis  alxiiit  tlie  color  of  the  feet,  that  it 
was  a  male.  If  this  male  specimen  were  still  in  his  collection, 
which  iiiil'oituiiately  is  not  the  case,  the  species,  which  lie  obtained 
from  >t\y  as  I'.J'nudnHits,  could  be  easily  jletermined.  Coi..,idering 
the  great  similarity  of  the  species  belonging  to  this  group,  this 
would  by  far  not  settle  the  (piestion,  whether  Say  liad  described  as 
P.  fimiiriitiis  one  of  these  spe(;ies,  or  whether  he  liad  mixed  it  up 
with  others.  I  regret  to  say  that  in  Wiedemann's  collection  there 
are,  under  the  name  of  J',  fimuridiis,  only  two  females,  which,  judg- 
ing by  the  pins,  came  from  Jjay  ;  one  of  these  females  i  believe  to  be 
J'.  SI  I'liiiKitor,  the  other  J',  ctiudatitlu.i  •  nsidering,  however,  the 
great  dilliculiies  attending  the  distinction  of  the  females  of  this 
groui),  I  cannot  render  a  positive  decision.  Thus  P./'cmorntns  o( 
Hay,  as  a  species,  will  have  to  remain  unnoticed,  as  it  cannot  be 
determined  with  certainty. 

6.  pallens   W'iii/.     This  species  i;  easily  recognizable  as  one  of  those  in 

my  possession.  Wiedema'iu  furnishes  only  the  description  of  the 
male  ;  in  the  following  I  communicate  tlie  description  of  both  sexes. 

7.  macula  W'ii'd.    This  is  a  species  entirely  unknown  to  me,  and  remark- 

able by  the  unusual  picture  of  the  wings, 
fci.  diflusus  W'ied.  In  ^V'iedemann's  collection  there  are  two  totally  dif- 
ferent males  under  this  name.  That  whicdi  bears  the  etiijuette  is 
remarkable  by  the  more  diluted,  as  if  diffused,  picture  of  the  wings, 
so  that  it  may  be  supposed  that  Wiedemann  had  this  specimen  par- 
ticularly or  exclusively  in  view  when  he  described  and  named  this 
species.  I  accept  this  specimen  without  hesitation  as  the  genuine 
P.  </i(/'u^us  Wied.  Upon  its  etitiuette  the  evidently  incorrect  state- 
ment of  its  patria,  "Savannah,"  is  crossed  out  and  changed  by 
Wiedemann  himself  into  "Rio  .Janeiro."  The  other  male,  placed 
alongside  of  the  etiquette,  is  that  of  /'.  Jnruiidus,  common  in  Cuba 
as  well  as  ill  lirazil.  In  Winthenrs  collection  a  male  and  a  female 
named  /'.  </;//«M/.s  are  found.  The  male  is  the  same  as  the  typical 
male  in  Wiedemann's  collection.  The  female,  which  is  alongside 
of  it,  agrees  very  well  in  mmiy  characters  with  P.  (Hjfuaits  J, ,  shows 
however  a  few  differei.ces,  such  as  should  not  be  expected  from  a 
female  of  /'.  ilijfitsiis.  For  the  outlines  of  the  picture  on  the  wings 
are  not  only  better  defined,  but  the  blackening  on  the  fore  margin 
beiiins  only  beyond  the  end  of  the  first  longituilinal  vein,  while  in 
the  iiiait^  it  begins  already  before  it ;  besides,  the  bristles  on  the  fore 
and  niiddle  tibim  are  very  much  longer  than  in  the  male  of  J\  ilif- 
f'li^ii.-i.  I  siiould  not  take  this  female  for  tliat  of  /'.  ilijl'iisus,  if  I  had 
not  reieived  a  iiumbi'r  of  jirecisely  similar  specimens  from  Hra/.il, 
as  beiiig  the  females  of  a  male  belonging  to  P  (lij/'iisn.s.     For  these 


rslLOl'LS. 


9;i 


o.) 


rp.a.aons  T  have  no  doulit  tlwit  this  is  the  genuine  ft-maK"  of  /'.  <l{l'~ 
I'll  US.  Tlio  siifciuicns  of  my  collcflion  show  tliiit  tim  (liHt'ieiice  in 
tlu!  fxtfut  of  tht)  liliick  I'ohiriug  on  tiin  loit;  iiiiiritlu  of  tiic  wings  in 
both  Sfxi's  is  not  always  so  cousiiit'ialilo  as  tin-  [lair  in  Wintheni's 
colii'ction  sliows  it.  If  tiiiMi,  in  aiconlanro  witli  llns  Ion-going,  tho 
easily  locognizalilo  male  of  /'.  ilijiums  is  to  he  sliiikcii  ont  from  tho 
list  of  North  Ameiican  speeies,  I  will  nevi'itheh'ss  ill^e^t  licie  a  more 
accui'ato  description  of  this  sjieeies,  which  has  heen  only  insutli- 
cieiitly  chaiacteii^etl  by  Wiedemann. 

P,  difB'llsils  WiEn.  %  and  9- — Viridis,  nitidissinius,  f.isclis  nigri- 
cantilms  alarum  duabus,  valde  <littlueiitihus,  antlce  eoniuiictis  ft  jios- 
tice  ahl)roviatis,  facie  nudil,  pedihiis  nigris,  tibiis  tar.-isiiue  anlicorum 
teslaceis,  setis  tibiarum  antern>rum  perlongis,  halteribus  nigris. 

^.  Luolius  ullimis  tarsorum  interuK^diorum  articulis  postice  caudido- 
pilosis,  appendiuibus  hypopygii  m.ijusuulis,  fuscis. 

0  .  Tibiis  tarsisijue  interuiediis  piceis. 

Green,  very  shining;  both  blackish  bands  of  the  wings  very  ditliised,  but 
united  in  front,  abbreviate<l  behind;  face  without  hairs;  ftet  black, 
tibia?  and  tarsi  of  the  fore  feet  brownish-yellow  ;  bristles  of  the  four  an- 
terior tibiae  very  long;   halteres  black. 

'J, .  The  two  last  joints  of  the  middht  tarsi  with  snow-white  hairs  on  the 
posterior  side;  the  rather  long  appendages  of  the  hypopygium  blackish- 
brown. 

9.  Middle  tibiie  and  middie  tarsi  pitch-brown.  Long.  corp.  0.22 — 0.23. 
Long.  al.  0.24— 0.2;'). 

Syx.  Psllo]>iis  (i:j/'iisiis  WiRO.,  Auss.  Zweifl.  II,  221,  17. 

Metallic-green,  brij^lit,  i^hiiiinu'.  The  lower  part  of  the  face, 
the  posterior  corne's  of  the  tiiorux  and  the  sculelluin  (in  one  of 
tho  males)  steel-bluh  The  very  nuich  cxcuvated  front  Ix'set,  he- 
sides  til''  usiui!  ?>;  'ck  J)ristles,  in  tiie  male  with  lon<>'('r,  in  the 
female  with  somowiat  shorter  and  more  sparse  hairs,  which  are, 
on  the  mid(,!e  of  the  front  of  a  whitish,  on  the  sides  of  a  more 
l)lackish,  in  the  male  even  of  an  ainnjst  black  color.  The  rather 
broad  face  is  "•lal)rous  and  only  very  sparsely  dusted,  its  lower 
part  rather  distinctly  separated  from  the  upper  part  and  the  latter 
rather  coiive.v.  Antennie  black,  rather  siindl,  the  second  joint 
with  rather  Ions;  l)lack  bristles  ;  the  arista  is  of  more  than  middlinir 
Icno'tli,  aiul  has  a  sidtapical  position.  Palpi  hlack,  with  nnmerous 
black  hairs  ;  prol)oscis  brown-idack.  'i'lie  iiristles  of  the  thorax 
and  the  four  l)ristles  of  the  scutellum  are  l)li!ck,  and  rather  lonu-. 
I'lemu'  with  white  dust.    The  green  color  of  the  ubdouieu  changes 


''i;i 


■>: 


'). .  * 


••1::' 


t  , 


m 


236 


DII'TERA  OP  NORTH  AMKIIICA. 


[I'AItT  If. 


jrnuliiiilly  upon  the  posterior  segments  into  frojdon-grocii,  iiiid  llio 
Inst  sr^iiR'iit  is  usimlly  entirely,  or  lit  leas,  piirtiiiljy,  of  a  stccl- 
liliR'  color.  Ill  till'  iiiale  tlicn,'  is,  near  tiio  basis  ui'  lacli  of  the 
al)(loiuiiiaI  scuinciits,  u  narrow,  l)ut  distinct  liiaclv  I»aiid  ;  in  tlic 
female  these  hiack  bands  are  still  narnnver  and  less  strikinj;-.  'i'jie 
l)lack  hair  upon  the  ulidoineii  and  the  black  bristles  before  the; 
)>osterior  nnirjiin  of  each  of  the  seiiinents  are  of  considerable 
leiiffth.  The  hypopyji'iiini  is  ratln.'r  small,  its  appendajjes  are  not 
snrticiently  well  ]>reserve('  in  the  described  nude  specimens,  to  re- 
cofj^nize  their  structure  accurately;  I  perceive  oidy  that  IIkt  are 
of  middling  lenji'th,  rather  broad,  of  a  dusky  brown,  and  at  the  tip 
of  a  more  black  color.  Co.xie  black,  ccnered  with  a  thin  whitish 
dust ;  the  anterior  co.xje  with  comparatively  lonj;  white  hairs  and 
towards  the  tip  with  a  few  black  bristles.  Femora  black,  on  the 
under  side  with  lonj^  erect  hairs,  which  are  white  near  the  basis 
and  black  at  the  tip,  and  are  much  loiifrer  in  the  nude  than  in  the 
fcnuile.  Fore  tibiae  and  fore  tarsi  brownish-yellow,  the  latter 
blackened  near  the  extreme  tip  ;  the  fore  tibiie  have  on  the  upper 
side  a  row  of  five  or  six  very  lonji;  black  bristles,  which  is  inter- 
rupted lon<!^  before  its  et'd,  and  of  which  the  last  one  is  the  lon<rest 
and  somewhat  longer  in  the  female  than  in  the  nmle  ;  I  ])erceivo 
in  the  nuile  on  the  under  side  of  the  fore  tibia3,  in  the  neighb(ir- 
liood  of  the  root,  a  rather  long,  ))tit  very  fine  bristle;  in  the  female 
this  bristle  is  much  shorter,  and  besides,  there  are  two  small  bris- 
tles inserted  at  e(pu\l  distances.  The  fore  tarsi  in  both  se.xes  are 
slender  and  of  a  plain  structure  ;  in  the  male  a  little  over  one  and 
a  half,  in  the  female  one  and  a  half  the  length  of  the  tibia  ;  they 
are  beset  only  with  the  usual  black  short  hair,  nevertheless,  in  the 
female,  there  are  on  the  under  side  of  its  very  elongated  first  joint 
four  very  short  bristles,  inserted  at  e(pial  distances  and  wanting 
in  the  male.  Middle  tibine  and  middle  tarsi  black  in  the  described 
nude ;  dark  piteh-brown  in  the  female  ;  the  middle  tibiic  have,  lie- 
sides  the  bristles  at  the  tip,  four  black  bristles  on  the  upper  side, 
which  are  rather  long  in  the  male,  but  still  longer  in  the  female  ; 
on  their  under  side  there  is  in  the  nude  only  one  long  black  bris- 
tle, which  is  very  near  the  root  ;  in  the  female  there  are  on  tlio 
under  side,  besides  the  bristles  at  the  tip,  three  bristles  of  conside- 
ral)le  length,  of  which  that  which  is  nearest  to  the  root  is  also  the 
longest.  The  nuddle  tarsi  are  of  moderate  length,  beset  oidy  with 
the  usual  black  hairs,  though  there  are  in  both  sexes  on  the  under 


I'S  1 1,(1  PL'S. 


23T 


siile  of  tlic  very  flonpati'd  first  joint  a  few  small,  vorv  sliort  liris- 
tlt's  ;  iiKti'i'ovt'r  ill  the  iiiiiic  liii'  two  last  joints,  upon  tlu'ir  postt'iior 
sido,  are  liesct  with  siiort,  l»iit  doiise,  siiow-wiiiii-  liair.  Hind  lil)iii; 
and  hind  tarsi  lilack  or  l)rown-l)hi('iv ;  the  usual  lilack  liuir  ii|Mia 
tlio  former  is  rather  long,  esjK'cialiy  on  tiie  inside  in  the  iieighiior- 
liood  of  the  basis  ;  on  the  outside  is  a  ntw  t»f  hiaek  ))ristles,  whieli 
reaches  from  the  basis  as  far  as  tiie  middle.  Hind  tarsi  not  strctiiji-, 
niueh  shorter  than  the  til)ia',  the  lirst  joint  longer  tiiiin  the  follow- 
ing ones  taken  together.  Tt-guhe  with  a  l)laek  margin  and  with 
black  (ilia;  the  lialleres  in  both  sexes  bnjwn-black.  Wings  gray- 
ish h\ aline,  with  the  usual  two  Itlackish  transverse  bands,  which 
are  very  extended  and  dilfuse.l,  and  as  they  unite  again  upon  the 
fouvtii  longitudinal  vein,  they  enclose  an  almost  square,  not  sharply 
defined,  hyaline  spot,  in  the  first  cell  of  the  posterior  margin;  the 
(lark  coloring  begins  in  the  male  on  the  anterior  margin  of  the 
wing,  already  before  the  end  of  the  lirst  longitudinal  vein,  in  the 
friiiale  somewhat  beyond  it.  and  extends  in  all  specimens  as  far  as 
the  end  of  the  third  longitudinal  vein.  The  posterior  transverse 
vein,  which  is  long  and  but  little  iiiilected,  lias  a  very  obli((uo 
jiosition;  the  anterior  l)raiicli  of  the  fourth  longitudinal  vein  forms 
with  it  an  angle  of  scarcely  sixty  degrees,  and  turns  afterwards  at 
a  very  much  rounded  right  angle  towards  the  tip  of  the  wing. 
llab.  Brazil. 


::;:! 


K;, 


I-  m. 


^^"■■, 


9.  guttula  Wied.  Of  tliis  species  tliere  is  a  well-preserved  pair  in  Wiede- 
uiann's  and  another  in  Wintliein's  collection.  Wiedemann's  state- 
ment tliat  this  specMes  is  from  Savannah,  is  a  mistake,  corrected  hj' 
himself,  and  rejihiced  on  the  etiipiette  by  "  Rio  .Janeiro."  In  Win- 
tliem's  collection  also,  Brazil  is  mentioned  as  the  locality.  There- 
fore this  species  must  be  stricken  out  from  the  list  of  North  American 
species.  As  Wiedemann's  description  is  not  sufficient,  I  give  a  more 
accurate  one  as  follows  : — 


I 


P.  gllttula  Wied.  %  and  J  .-  )l)scure  feneo-viridis,  rapite,  scntello 
et  thorace  postico  intei.lum  violaceis,  abdomiiie  cupreo,  in  ajii(;e  viola- 
ceo,  in  basi  plernmipie  viridi,  fai-ie  nuda,  pedibns  simplicibus,  ol)scuris, 
alarum  fisciis  duabus  nigris  valde  dilatatis,  antice  eonjunctis  et  postice 
abbreviatis,  in  vena  longitudinal!  quarts  contluentibus,  ita  ut  gnttam 
hyalinam  majusculam  includaiit. 

%.  Tibiis  oliscure  piceis,  halteribus  ex  fusco  nigris,  abdoraine  nigro-faa- 
ciato,  appendicibus  hypopygii  minuti  parvis,  nigricaiitilms. 


■~i 


♦  ;- 


I 


*'• ; 


I^J 


ji 


,238 


IHl'TKIlA  (»F  NOIITII  AMKHU'A. 


[ 


I'Aur  II. 


9.  Tiliiin  ex  flaro  tewtnceis,  halteiiliUM  Huvis, abilotnine  Hulioh^aolnti- iiinro- 
t'lisuiiiti), 

Diirk  br()iiz('-cre»'ii,  liiviil,  Hciitclhun  and  liirnl  part  of  the  thorax  pomftitm-s 
violet;  ali<l<)iiifii  coiipcry,  at  tin-  tiji  violnt,  at  th»)  basis  usually  >.'rt'i'n  ; 
face  glalirous,  feet  jiiaiii  tiiid  dark  colored  ;  the  two  broad  black  baiMlsi 
on  tlie  willy's  art-  united  in  front  and  shortened  behind:  on  tlie  fomtit 
hmgitudinal  vein  tliey  again  run  toHetiiur,  so  as  to  enclose  u  rather  lar^ti 
hyaline  drop. 

^ .  Tibia-  dark  pitch  brown,  lialteres  brown-black  ;  abdomen  with  black 
bands;  the  small  hytK)|)ygium  with  small  black  appendages. 

9.  TibifB  yellow-brownish  ;  halteres  yellow;  abdonnMi  with  but  rather 
indistinct  black  bands.     Long.  corp.  O.IH — 0.22.     Long.  al.  l».17 — (M!». 

Sy.n.  /'sihi/iiiK  </iiHula  WiE»KMA.NN,  Auss.  Zweifl.  II,  222,  18. 

Of  modoratoly  hrifjlit,  (lark-metallic  color,  wliicli  scorns  to  bo 
cliioHy  ^rooM  on  head  at  1  thora.x  ;  on  tlio  abdonioii  ))riiici|tully 
copjiery  and  violet.  Jfcad  sliiniiijr  frrooii,  rarely  sliiniiifr  Idack- 
frreoii,  llioiigli  the  front  is  always  stool-lilin!  or  violet  ;  on  tlie  vor- 
te.\,  besides  the  usual  bristles,  it  is  also  beset  with  I)laek  hairs. 
The  face  is  not  very  broad,  without  hair,  and  o.\hil)its  but  a  sjifi'lit 
trace  of  whitish  dust.  Antennie  iiiack,  of  moderate  size  ;  the  i)ris- 
tlc.s  of  the  second  Joint  not  very  loiijr.  Palpi  blnek,  beset  with  a 
few  stilf  l)Iack  hairs  ;  ])roboscis  brown-black.  Thorn.x  dark  ir.^^'tal- 
lii  uTcen,  usually  on  the  lateral  inarji'in  and  s(»nu,'times  011  the 
\vh(de  posterior  half  of  a  violet  color.  The  bristles  of  the  thora.x 
and  the  four  bristles  of  the  jrreeii  or  violet  scutellnm  are  bliick  ; 
pleune  <rreen,  on  the  posterior  inar<rin  more  black,  everywhere 
<'()vered  with  white  dust.  Abdomen  towards  the  tip,  especially 
ii!  the  mide,  very  ]>ointed  ;  its  color  is  usually  cliicdy  coppery,  c.t 
the  ti])  always  violet,  near  llic  basis  often  a-reeii  ;  sometimes  tli(! 
violet  color  extends  almost  over  the  whole  abdomen,  but  even  then 
the  posterior  margins  of  the  fore  and  middle  abdominal  scu-menis 
remain  of  a  coppery  color  In  the  male  each  of  the  abdoiiiiniil 
scfrinents  has  near  the  basis  abroad,  but  not  sharply  delined  bhick 
]>and  ;  there  ire  also  traces  of  them  in  the  female.  The  black  hair 
on  the  abibmien  and  the  black  Itristles  before  the  posterior  inarLiin 
of  each  seirment  are  but  of  middliufr  leufi-th.  The  extremely  sniiill 
hy])opy<rium  is  black  ;  its  short  ap])endafres  are  blackish.  Coxa' 
black  with  thin  white  dust,  the  foremost  ones  with  white  hair  and 
in  tlie  vicinity  of  the  tip  with  a  few  black  bristles.  Femora  black, 
on  the  under  side  with  rather  loufr  erect  white  little  hairs,  inter. 


i'siLoi'ia 


SOU 


pporscd  now  niid  then  with  a  lifllr-  liliick  Imir.     Til)iir  nf  the  inalu 
hrowii,  iiftir  the  root   l)hi(-k-l)niwii  ;  the  iiiiddio  til>ia-  uii  thi.>  out- 
Hide  witii  a  re^iilur  row  of  i)hli*|iiely  inserted  Iduek  l)l'i^llt's  ;  uii  tlie 
outside  of  the  fore  til)iu;  there  is  u  low  iif  five  or  «i.\  Idark  Ijristies, 
which  does  nut  reacli  as  fur  as  the  lip  ;  the  hind  tiSiu'  are  witlimit 
ln'isties.     Tihiiu  of  the  female  yellow,  near  the  foot   liritwn  ;  the 
fore  and  middle  tibitu  with  a  few  sparse  bristles;   the  hind  tiiiije, 
ns  in  the  male,  without  bristles.     Tarsi  l)laek-i)rown,  those  of  tho 
female  less  dark  than  those  of  the  male,  in  both  Hexes  plain  ;  tho 
foro  tnrsi  of  the  male  are  about   1^  the  lenjrth  of  the  til)iu',  ilieif 
first  joint  is  alxmt  H  the  len|;th  of  th<'  followinjr  j(»iiits  tntrether, 
and  beset  upnn  the  middle  of  the  ontside  with  two  black  bristles; 
its  middle  tnrsi  are  not  (juite  ]},  the  rnjrih  of  the  tibia-,  their  tir>t 
joint  is  more  than  U  the  Ien;rth  of  all  the  jther  joints  tojrether, 
and  beset  with  a  few  black  bristles;   its  hind  tarsi  are  somewhat 
stout,  shorter  than  the  hind  tii)ije,  and  their  first  joint  not  iiiiich 
lonf^er  than  all  the  others  tofrether.     The  fore  and  middle  tarsi  jf 
the  female  are  somewhat  shorter  than  those  of  the  male,  a!id  their 
first  joint  is  much  less  eloiifrated  ;   its  hind  tarsi  are  more  slen<ler 
than  tiiose  of  the  mah'.    Tho  teii'uhe  have  a  l)lack  mar<rin,  and  are 
frinjred  with  loiiir  black  cilia.    The  halteres  of  the  male  are  brown- 
i)lack,  lh  »se  of  the  female  yellow.     Win^^s  hyaline  with  the  usual 
two  black  bands,  united  on  the  anterior  mar^nn  and  alilireviated 
Itefore   the  posterior  marfrin  ;   they  expand   in  a  rather  unusual 
manner,  and  coale.sec  nj^ain  upon  the  fourth  lon^'itudinal  vein,  so 
as  to  enclose  a  lar;j:e  drop  in  the  first  cell  of  the  ])osterior  maru'in  ; 
on  the  anterior  mar<rin  the  darker  colorintr  botrins  rather  far  licfore 
the  end  of  the  first  htnjritudinal  vein,  and  does  not  reach  to  the  cikI 
of  the  third  vein;  the  anterior  branch  of  the  fourth  lonii'itudimd 
vein  forms  an  acute  anjrie  with  it  and  turns  then  at  a  somewhat 
rounded  anti'le  of  about  eiy-hty   dei>-rees  towards   the    lip  of  the 
wiiifi,  pursuiuL''  this  course  in  a  rather  straiirht  line;  the  posttrior 
transverse   vein  is  ,-lraijrht,   has,   howin'cr,   a  somewhat    obliipie 
position. 

Huh.  Rio  Janeiro.     (Coll.  Wied.  and  Winth.) 


10.  caudatus  ]Vir(l.  Wiedcm.itin's  statenn'iits  sppm  to  ]irnvc  1  pyoml 
doubt,  that  this  species  l)el(iiii:s  to  tlie  ri-l.-itiimship  of /'.  .-<■■  I  imif'/r ; 
among  the  species  of  this  kiml  I  know  Imt  one  wliicli,  lik.-  cnmlniiis^ 
is  distinguished  by  tlie  extraiirdinary  length  of  the  hairs  at  tlie  e.x- 


I-' 

[ 

i. 


IJ. 


1m 


►!; 


!l 


,fl; 


K' 


1:1 


'1 

J.  •] 

.•■■I' 

■  ;■'.■  A--'-     '  i 


fir : 

...  i;]i8iiM; 


240 


DIl'TKKA  HK  NoItTir  AMi:i!I('A. 


[I'AIIT  II. 


trt'iiii'  tip  of  tlu'  mull'  nliil>itinMi ;  this  spinier*,  which  I  have  ciiII'mI 
J',  riniiliiiii/it'i,  (lilt'crs,  hoHi'Vcr,  fVoiii  /'.  niiiilnlii.s  by  its  siiiiillcr  si/.o 
too  milch,  to  lie  iiiirtlakcii  tor  it.  In  WiiMh-niniiii-Wiiitht'in's  colleo- 
tion  no  inrorinittioii  whatever  is  to  lie  t'ouinl  ai>oiit  /'.  iinnluhm,  \\\ 
tlie  Herlili  Muselllil  thent  is  ii  Hpeciiiiell  of/'.  imiKihis,  nxuU'r  the 
liaiiie  of  /'.  riiiiiliiiiis  ;  I  eauiiot,  howtn'er,  nckiiowledge  the  correct- 
iiess  of  this  ih'tei'iiiiiiation,  as  Wieih'iiiatin  (li-tiiii'tiy  says  that  tliH 
feinahf  of  liis  /'.  riniilnhis  has  no  hlaek  femora,  likii  the  male,  hut 
yellow  ones,  vliile  this  is  not  the  case  with  /'.  cnniiitiis.  Tho  typical 
Hpeiimeii  of  /*.  eiiiiitnhis  is  in  Westerinann's  collection. 

11.  virgo  Willi.     The  description  of  a  female,  which  also  seems  to  helong 

to  the  circle  of  relation^'hip  of  /'.  srnhluiitiir.  The  statements  which 
Wiedemann  gives  aliont  it  are  so  uncertain,  that  no  conclusion  as 
to  the  species  to  whiidi  tho  described  specimen  heIoni,'ed  can  Im 
drawn  from  them.  The  size,  as  stated  by  Wiedemann,  is  uiortf  con- 
siderable than  the  size  of  the  females  of  all  the  npecies  of  this  rela- 
tionship that  are  known  to  me.  The  typical  sin-cimeii  is  not  to  ho 
found  in  Wiedemann's  collection,  so  that  a  satisfactory  solution  as 
to  this  sj)ecies  is  iirobably  never  to  be  expected. 

12.  mundus  Wii'd.     Of  this  species  there  are  two  males  in  Winthem's 

collection,  tnarked  as  Wiedemaini's  types.  Had  I  known  them  be- 
fore I  published  the  Kighth  Cart  of  the  "  Neue  Heitiili^e,"  I  should 
not  have  ventured  to  describe  in  that  volume  /'.  ri/inhis  as  a  species 
dill'erent  from  /'.  miiiiilu:i.  Certainly  both  specimens  in  Winthem's 
collection  are  very  much  smaller  than  the  male,  which  was  the  tyj)e 
of  my  description  of  P.  cilin'ii.i,  and  their  coloring  is  darker  and 
more  distinctly  violet;  but  in  all  the  plastic  characters  tliero  is 
much  similitude  betwe-n  them  and  tho  male,  which  I  have  de- 
scribed. The  only  pi  ■  ic  dill'erence,  whicii  I  can  discover,  is  the 
followiiii;;  in  P.  7niiiiili(s  theio  is,  besides  the  row  of  bristle.>(  on  tho 
outside  of  the  fore  tibia;,  also  a  second  row,  placed  further  towards 
the  inside,  and  which  is  tolerably  complete ;  in  /'■  ciliattis  this 
second  row  is  also  present,  but  it  is  as  complete  as  in  /'.  mididus 
only  in  the  vicinity  of  the  root  of  the  tibi.-p,  further  on  it  is  (appa- 
rently) more  incomplete;  however,  no  accurate  judgment  can  bo 
based  on  a  single  specimen,  and  moreover  the  difference  is  so  trilling, 
when  compared  to  tlie  great  conformity  in  the  extraordinary  struc- 
ture of  the  wings  and  of  the  fore  tarsi,  that  too  nundi  stress  is  not 
to  be  laid  upon  it.  As  tlie  name  "  riliatns'^  has  already  been  be- 
stowed upon  this  species,  I  may  be  permitted  to  retain  it,  until  the 
identity  of  the  species,  so  named,  with  /'.  miiiKlus  has  been  more 
positively  established.  A  separate  description  of  the  latter  is  unne- 
cessary, as  no  mistake  can  occur  if  a  proper  attention  is  paid  to  the 
description  of  P.  cilialiis,  as  well  as  to  what  has  just  been  said 
about  these  species. 
1?'.  radians  Mmq,     First  described  in  the  "  Suites  i  Buffon ,-"  the  same 


I'SU.dlMS. 


241 


ilKscriptioii  irt  fmiiid  in  the  hijitlnn  fxatiiiiifH  II,  2,  122,  only  in  tint 
latter  it  is  riiiiil  "Jiimlifn  I'osi'KHiKUlii;.-' «<  inh  rmiiliniii s  Jiiuudivi s,"  iii'* 
ntfiul  «(  " JdiitlirM  A.S'i  i:mKi'i;i:s  (7  iiili  nnriliiilrin  Juuiiiiiri  .■•."  Tliat  tliit* 
is  nii'i'fly  fi  nii.si>riiit,  is  (U-idciit  t'loni  uiiHt  Mr.  Maeiiuart  hiivs  in 
/h'jii.  cjriit.  //,  2,  1-li,  at  tilt)  top  (if  tliH  jxik't'.  All  tlin  iliaiaitiTrt 
btated  liy  Mr.  Mau(jiuut  am  also  those  of  J',  lo.i;/ironiin  Fiibr.,  80 
th.1t  Mactiuart's  species  cannot  he  distinguislieil  from  it. 

14.  portoricensis  Mn'ij.  A  very  inroniplete  description  of  a  fcniale  (irst 
j^iveii  in  till)  '•  Siiltts  i)  Jiiiif'iiii,"  and  then  repeated  in  the  /tijil'''n^ 
/•.niiitiiics,  J/,  '2,  121.  Mr.  .Ma(:c|iiart  au'ain  mentions  this  sjH-cies  in 
J)/))!,  (.ml,  Siijiiil.  I,  l:ii>,  and  furnisheH  there  a  llgiire  of  tiie  wing 
(tail,  xi,  tlic.  17).  Tlie  only  (diaraeter  eontained  in  the  description 
nnd  which  may  leail  at  once  to  the  recognitiun  of  this  spei'ies,  is  the 
puhu.scencu  at  the  hasis  of  the  arista  ;  another  character  of  this  kind 
may  perhaps  he  found  in  Macipiart's  llgure  of  the  winir,  where  tini 
anterior  hranch  of  the  fourth  longitudinal  vein  is  closely  ajiproxi- 
mated  to  the  margin  of  the  wing.  I  know  of  no  siiecies  possessing 
these  charactei's. 

1.').  sipho  Mocij.  I  have  already  remarked  that  the  species,  whidi  Mr. 
Macqiiart  has  described  under  this  name,  is  (juite  ililt'enMit  from  tlio 
genuine  siphu  Say,  and  prohahly  identical  with  /'.  jiiciiin/iis,  with 
whicli  it  will  liave  to  ho  united  as  a  synonym. 

10.  incisuralis  Mmij.  Tlio  description  {JJijil.  ixut.  Suj)/!!.  I,  120)  has 
heeii  drawn  from  a  female  ;  in  an  observation,  however,  Mr.  Mac- 
quart  declares  that  )io  possesses  a  male  belonging  to  this  female; 
the  characters,  however,  wliicli  ho  furnishes  render  it  very  doubtful 
that  they  belong  togetlier.  I  tliereforo  take  into  account  the  de- 
scription of  the  female  only.  It  belongs  to  the  group  of  sjiecies 
which  resemble  by  the  picture  of  their  wings  /'.  ilij/'iisus,  .sh/k  rhu-t, 
&c.,  but  does  not  seem  to  bo  identical  with  any  of  these  si)ecies  ;  it 
lias  also  some  resemblance  with  a  female  in  my  collection,  from 
Brazil,  whicli  Wiedemann  himself  liad  deterniine<l  as  /'.  iinltuhi, 
but  which,  nevertheless,  does  not  belong  to  this  sjiecies  ;  however 
the  band  on  the  wing  is  much  broader  and  connected  with  the  spot 
near  the  tip  of  the  wing  not  only  at  tlie  anterior  margin,  as  it  is  in 
the  other  sjiecies,  but  also  upon  the  fourth  longitudinal  vein. 
Therefore  iiin'surtilis  seems  to  be  an  unknown,  but  independent 
species. 

17.  delicatus  ]\'((lk-.     A  female,  evidently  belonging  to  the  si)eci«s  with 

pale  cilia  of  the  tegulic.  None  of  the  species,  known  to  mo,  com- 
bines pale-iolored  two  first  joints  of  the  antenme  with  a  green-colored 
abdomen,  except  /'.jili/n's  Lw.  ;  this  species,  however,  has  a  whitish 
and  therefore  very  striking  pubescence  of  the  abdomen,  llonce 
(k'lii'dtiis  Walk,  is  not  among  the  species  known  to  me. 

18.  gemmifer  Wall:.    Tlie  specimen  described  is  a  male.    In  the  descrip- 

tion no  dill'ereuce  can  be  discovered  between  it  and  sipho  Say,  so 
16 


(■■ 


■ii 


M  '■  ■ 


242 


PIPTKHA  OF  NOUTII  AMKRICA. 


[PAKT  ir. 


tliat  we  are  induced  to  take  it  for  a  specimen  of  the  Icatter  witli  ;i 
but  little  (U'velojied  i)icture  of  tlie  wings,  unless  much  ptresn  is  laid 
upon  the  circunistance,  tliat  Wallier  calls  the  api)enilages  of  the 
hypopygiiMu  *(l(tih  jiitvhy"  wliile  t-liey  are  of  a  ln^wn-black  color, 
even  in  specimens  tlie  color  of  wliich  is  lut  little  developed. 

in.  chrysoprasi  Wnlh.  Described  without  statement  of  tlie  sex.  Tlio 
descri[)ti()u  agrees  tolerably  well  wiJi  a  species  from  Cub/i,  only  the 
statement  about  the  color  of  the  feet  does  not  agree  entirely. 
Nevertheless  I  believe  it  to  be  the  species  of  Walker;  I  hnvi; de- 
scribed it  below  with  the  necessary  cliange  of  its  name  in  /'.  dir/jxn- 
])r(.'sli:s. 

20.  Buavium  Walk:  Described  without  stating  the  sex,  evidently  a  spe- 
cies with  black  feet,  which  belongs  to  the  relati(Uiship  of  {i(ililiul(itH<t 
Say ;  the  description  contains  no  characters  wliich  would  assist  in 
determining  this  species. 

'M.  amatus  Walk.  Male  and  female.  The  remarkable  statement,  that 
the  abdominal  segments  of  the  male  have  black  bands  on  their  jios- 
terior  margin,  agrees  with  no  species  known  to  me,  and  jnoliably 
with  no  species  of  /'silopin^  whatever,  because  the  black  abdominal 
bands,  apparent  in  so  many  species,  are  alwaj-s  found  on  the  ante- 
rior margin  of  the  segments.  Mr.  Walker  means,  j)erhaps,  the  nar- 
row margins  on  the  po^■,terior  border  of  t'ach  segment,  which,  when 
seen  in  a  certain  light,  have  a  black  appearance  ;  or  he  nia^-  have 
simi)ly  made  a  mistake  in  stating  "posterior  margin"  instead  of 
"anterior  margin."  Besides  this  doubtful  statement,  all  the  rest 
agrees  so  well  witli  specimens  of  jiiililnildlits,  with  faded  outlines  of 
t'  ■'.  picture  of  the  wings,  that  aiiKitits  Walk,  must  be  taken  for  a 
synonym  of  this  species,  until  more  satisfactory  marks  of  distinc- 
tion to  separate  it  from  patlhithihitt  are  found. 

22.  inficitus   11'"/^-.     Mr.  Walker  makes  no  statenn^nt  about  the  sex  of 

the  sj)eeimen  ;  as  however  in  the  group  to  whicli  this  species  belongs, 
the  haltercs  of  the  males  are  usually  blactk,  and  those  of  the  females 
are  usually  yellow,  we  may  conclude  that  it  was  a  male.  This 
being  admitted,  its  description  contains  no  character  whereby  injj- 
vilia  (vnild  be  distinguislied  from  dark-colored  males  of  jintihuldiiis, 
and  the'i'fore  it  must  be  pi.  ceii  at  i)i'esent  among  its  synonyms. 

23.  nigrofemoratus  Walk.      Described  without  statement  of  the  sex, 

probably  after  a  male  related  to  scuhimttnr.  One  variety,  B,  is  said 
lobe  distinguished  by  the  tip  of  the  femora  and  the  whol(>  tibia? 
being  yellow.  It  is  easy  to  perceive  that  this  is  no  variety,  but  a 
dillerent  spiicies,  aii  ^  probably  the  male  of  ?H(r/«/.s-,  which  will  be 
described  further  below.  As  in  this  species  the  tijjs  of  the  fore  and 
middle  femora  oidy  are  yellow,  therefore  the  femora  of  iiiiirnj)  iimni- 
tits  Walk.,  in  conformity  with  its  description,  must  be  of  an  entirely 
dark  color;  thus  niifrnfintoratus  cannot  be  mistaken  neitlier  for 
scubiiKitor,  nor  calcaralus,  nor  cdtulatut:,  the  femora  of  wlucli  are  jire- 


PSILOPl'S. 


24.} 


cisely  of  the  same  color  as  those  of  incriiilr:.  I  (iannot  therefore  ;e- 
coi^iii/.e  this  species  of  Walker  in  any  of  the  si>et;ies  known  to  nie. 

24.  albicoxa   Walk.     Male  and   female.     Of  the  HjKnies  known   to  nie, 

only  P.  sriiitillinis  apjiroaches  tliis  species.  Walker  says  of  his 
sjieciea  tliat  tlie  fore  and  middle  tarsi  are  hiack  only  at  the  tip,  the 
hind  tarsi,  however,  entirely  lilaek  with  the  exception  of  tln^  lust 
joint.  In  my  species  all  the  tarsi  are  of  a  uniform  color,  namely, 
yellow  near  the  root,  hnt  from  the  tip  of  the  first  joint  black-lirown. 
I  cannot  therefore^  take  uriiilillniis  for  Walker's  (illiicorn,  and  the 
men!  so,  as  Walker's  description  contains  no  statements  about  any 
plastic  distin(dions,  which  might  servo  as  a  clue  to  determination, 
wliiln  sciii/ilhiiis  j)ossesses  so  remarkable  and  so  striking  plastic 
cliar,'u;ters. 

25.  lepidus  ]\'it//,:     The  described  male  seems  to  belong  to  a  species  very 

nearly   related   to  jintiliuldtus,  or  to   be  this   very  species.      After 
Walki'i''s  dcscripf  ion  nothing  more  can  be  said  abinit  it. 
2(1.  ungulivena  W'ullc.     The  description  agrees  with  none  of  the  species 
known  to  me. 

27.  solidiis   Ma//.-.     The  description  of  the  female  of  a  species  with  en- 

tirely black  feet,  from  the  r(;lationship  of  jKitiliiilaiux,  which  seems 
to  he  distinguished  from  all  similar  species  by  a  more  robust  struc- 
tur(!  of  the  body.  Tin;  description,  however,  contains  nothing  which 
would  make  it  possible  to  determine  this  s]>ecies  with  more  cer- 
tainty. 

28.  peractus  Wall.    A  female  from  the  relationship  of  /'.  Imniiroruls  and 

chiysfijiritsiiis.  The  characters  stated  are  insullicient  for  its  deter- 
mination. 

20.  haereticus  W'lll.  A  female  from  the  relationship  of  the  ])rcceding 
species  and  similar  to  it,  also  described  in  a  very  unsatisfactory 
manner. 

30.  permodicus  U'allc.  The  male  of  a  species  remarkabb?  by  the  slen- 
derness  of  its  body,  an<l  which  Mr.  Walker  attemjjts  to  describe  in 
three  lines  and  a  half.  I  know  of  uo  species  to  which  his  descrip- 
tion might  be  r('f<>rred. 


"in, 


Tints,  the  scanty  result  of  tlio  iiKpiinVs  att('nii)t('(l  on  tlio  ])ro- 
vioiisly  pultlislicd  tliirty  .Xoctl)  Anicriciiii  species  is  tlic  lolluwiii^' : 
Two  species,  (UjI'iikk.^  VVicd.  nit^J  (jatluld  Wicd.,  must  bo  stricken 
out  from  the  list  of  Nortli  American  species.  Of  the  other  species 
1  recognize  live  anioii<>'  those  in  my  possession,  nanu'ly,  aiplio  Say, 
patV  ulahix  Say,  y^r/Z/c/j.s  Wied..  and  ('■/(/v/.s'o/y/Y/.s/ Walk.  ;  the  lirst 
throe  are  reproduced  liolow  ninlcr  th<'  same  nnnics,  the  last  one  as 
chri/Kopra.-iiiis.  There  is  a  species  which,  very  pr()l)al)ly,  is  the 
same  with   ono   doscribod  by  mo  as  now,   nanioly,  mundut^  Wicd. 


Pi 

i ,. 


m\ 


244 


DIPTERA  OF  NORTH  AMERICA. 


[part  II. 


with  ciliatus.  Five  species  have  to  be  recorded  as  ■.ynonyins  )f 
others;  tliesc  are  radians  Macq.,  as  a  synonym  of  longicoi'm's 
Fab.,  sipho  ^lacq.  (jf  juvundus  Ijoew,  gemmij'ei'  Wall<.  of  sijiho 
Say,  amalus  Wiillv.  of  iiatibulalus  Say,  aud  inficilus  AVallior, 
likewise  oi  palibulutus  Say. 


Table  for  the  determination  of  tlie  Species. 


2 

15 

3 

S 


6 


10 
11 

12 
13 


(  Tegulfc  witli  black  cilia. 

*  Teguhe  with  pale  cilia. 

(  Wings  with  a  <larkf  r  picture. 

(  Wings  without  picture. 

'  Wings  black,  hyaline  only  at  the  tip  and  the  hind  margin. 

1  dimidiatns  Lie. 
Wings  hyaline,  with  two  black  fjisciiB  connected  on  the  anterior  mar- 
gin. 4 
I  Feet  of  the  ^  predominantly  yellow.  5 
(  Feet  of  the  %  predominantly  black.  6 
First  joint  of  tlje  middle  tarsi  of  the  %  with  a  few  ordinary  bristles 
upon  the  anterior  side.                                                   2  sipho  >Si///. 
First  joint  of  the  middle  tarsi  of  the  %  closely  ciliated  with  short 
erect  bristles  on  the  anterior  side.                             3  scaber  /.«•. 
I  Face  hairy,                                                                  4  patibulatus  >«//• 
(  Face  without  hairs.  7 

{Feet  in  both  sexes  entirely  black.  5  melampus  /.»•. 

Feet  in  both  sexes  not  entirely  black.  8 

Middle  tibise  and  lirst  joint  of  the  middl'j  tarsi  of  the  %  ciliated  on 
the  upper  side.  C  pilosns  /,«'. 

Middle  tibiip  and  first  joint  of  the  middle  tarsi  not  ciliated  on  tlie 
upper  side  in  the  %  .  7  jucundus  /.n: 

First  longitudinal  vein  much  prolonged  beyond  the  middle  of  tlie 
wing.  8  ciliatus  /."•. 

First  longitudinal  vein  reaching  at  the  utmost  as  far  as  the  middle  of 
the  wing.  10 

t  Arista  extremely  elongated,  apparently  apical.  9  comatus  /.«'. 

(  Arista  not  very  elongated,  distinctly  dorsal.  11 

(  Fore  tibiaj  >f  the  ^  ,  fore  and  middle  tibi;e  of  the  9 »  yellow. 
I  1<"  chrysoprasins  Wa/L: 

(  All  tibife  of  the  %  ,  in  the  9  'I'so  the  femora,  yellow.  12 

f  The  first  joint  of  the  middle  tarsi  of  the  ^  beset  with  crooked  bris- 
]  ties.  V.i 

'  The  first  joint  of  the  middle  tarsi  of  the  %  plain.  14 

Tip  of  the  abdomen  of  the  ^  with  moderately  long  hairs. 

11  scobinator  JTm. 
Tip  of  the  abdomen  of  the  '^  with  exceedingly  long  hairs. 

12  caudatulus  Lw. 


PS1L0PU8. 


245 


14 

15 


M 


20 1 


Middle  tibire  of  the  %  with  strikingly  long  spurs.  13  calcaratus  /w. 
Middle  tibi;e  of  the  ^  without  long  spurs.  14  inermis  Lw, 

Antennse  entirely  black.  15  scintillans  Lw. 

Two  first  joints  of  the  antennae  yellowish.  16 

Fore  femora  without  thorn-like  bristles  upon  the  under  side.  17 

Fore  femora  with  yellowish  thorn-like  bristles  upon  the  underside.  20 


Atidomen  at  the  basis  not  yellow. 

Abdomen  at  the  basis  yellow  [not  metallic]. 

Tarsi  for  the  most  part,  black. 

Tarsi  but  little  infuscated  towards  the  tip. 

Ail  the  coxse  entirely  yellow. 

Mi'M'e  coxa;  gray  with  yellow  tip. 

AU  1     ■  cox;e  entirely  yellow. 

Midd-rf  and  hind  coxai  blackish. 


l(j  pallens  Wied. 

18 

17  variegatua  Lw. 

19 

18  bicolor  Lw. 

19  psittacinus  Lie, 

20  tener  J.w. 

21  filipes  Lw. 


Systematic  arramjement  of  the  Species. 
I.  Tegulie  with  black  cilia. 

A.  Wings  with  a  dark  picture. 

A.  Wings  lilack,  only  the  tip  and  the  hind  margin  hyaline. 

1.  dimidiatus  L.n: 

B.  Wings  hyaline  with  two  fascise  connected  at  the  anterior  mar- 


gin. 

2.  sipho  Sin/. 

3.  scaber  Lw. 

4.  patibulatus  Say. 


5.  melampus  Lio. 

6.  pilosus  Lw. 

7.  jucunduB  Lie. 


B.  Wings  without  dark  picture. 

A.  First  longitjidinal  vein  reaching  far  beyond  the  middle  of  the 

wii 

8.  ciliatua  L.w. 

B.  First  longitudinal  vein  reaching  at  the  utmost  but  to  the  mid- 

dle of  the  wing. 

1.  Arista  apparently  apical  and  remarkably  elongated. 

9.  comatus  Lw. 

2.  Arista  distinctly  dorsal  and  not  remarkably  elongated. 

a.  In  the  %  only  the  fore  tibire,  in  the  9  also  the  middle 

tilii.'''   vf'llow. 

10.  cbryBopraBtus  Walk. 

i.  In  the  '^  all  tibinn,  in  the  9  ^'^o  ^^^  femora,  yellow. 
M.  Bcobinator  r.n:  13.  calcaratus  I^w. 

1-.  caudatulus  Lw.  14.  inermis  Lw. 


^' 


!» 


'',  M^' 


';  J. 


24G 


DIPTERA  OF  NORTH  AMERICA. 


[part  II. 


II.  Tegulae  with  pale  cilia. 

A.  Anteniije  entirely  black. 

15.  Bcintillans  Lw. 

B.  Tlie  two  first  joints  of  the  antennae  pale. 

A.  Fore  femora  in  both  sexes,  or  at  least  in  the  %  ,  without  yellow 

thorn-like  bristles  upon  the  under  side. 

1.  Abdomen  at  the  basis  not  yellow. 
10.  palleus  Wied. 

2.  Abdomen  at  the  basis  yellow,  not  metallic. 

a.  Tarsi  for  the  most  part  black. 

17.  variegatUB  Lw. 

b.  Tarsi  towards  the  end  but  little  infuscated. 

a.  All  the  coxffi  entirely  yellow. 

18.  bicolor  Lw, 

B.  Middle  coxa  gray  with  yellow  tip. 
1''.  psittaicinuB  L2u. 

B.  Fore  femora  in  both  sexes  with  yellow  thorn-like  bristles  upon 

the  under  side. 

1.  All  the  coxjE  entirely  yellow. 

20.  tener  J.w. 

2.  Middle  and  hind  coxse  blackish. 

21.  iilipes  Lw. 


Mn 


Description  of  the  Species. 
I.    TeGI  L.E    CILIATED    WITH    BLACK. 

A.    Wings  with  a  black  picture. 

A.  Wings  black,  only  the  tip  and  the  hind  margin  hyaline. 

1.  P.  (liniidiatus  Lokw.  ■^ .— Nitidissimus,  capite  thoraceque  vio- 
lacelrt,  abdoniine  viridi  ;  pedes  simplices,  graciles,  femoribus  nigris,  tibiis 
fltivis,  tarsis  fuscis  ;  alae  ex  fusco  nigrffi,  trieute  apicali  et  margine  pos- 
tico  hyallnis. 

Very  shining  ;  head  and  thorax  purplish-blue,  abdomen  green  ;  feet  plain 
and  slender  with  Mack  femora,  yellow  tibia;  and  brown  tarsi ;  wings 
brownish-black,  the  last  third  and  the  hind  margin  hyaline.  Long. 
eorp.  0.17.     huna,.  al.  0.19. 

Syn.  IVdopns  dimidiatus  LoEW,  Berl.  Ent.  Zeitschr.  VI,  216,  70. 


psiLorus. 


247 


Head  purplis]i-l)luc  ;  the  front  has,  besklcs  the  ordinary  black 
Jjristk's,  no  ituhcsci'iu'e  ;  the  naked  face  is  rather  densely  covered 
with  whitish  dust.  The  small  antennui  are  black  ;  their  second 
j(»int  is  beset  with  only  a  few  short  lu'istles  ;  the  arista  is  of 
medium  size  only  and  has  a  dorsal  position.  Proboscis,  brownish- 
yellow  ;  palpi,  blackish-brown.  The  coloring  of  the  thorax  is 
puri)lish-blue,  shining,  but  changes  ui)on  its  posterior  lialf  into 
steel-blue,  and  before  the  s-utellum  even  into  a  bluish-green. 
Scutellum  greenish-blue.  Pleurie  black  with  a  greenish  reflec- 
tion, dusted  with  white.  Abdomen  metallic-green,  shining  ;  the 
bristles  of  the  single  segments  before  the  hind  margin  are  but  of 
medium  length.  The  hypoi)ygium  is  small  ;  the  form  and  color- 
ing of  its  appendages  cannot  be  distinguished  with  certainty  in 
the  described  specimen,  still  the  si^e  of  the  appendages  seems  to 
be  but  small.  Coxie  brownish-black,  dusted  with  white,  the  fore- 
most with  minute  whitish  hairs  and  bristles.  The  slender,  rather 
glabrous  femora  are  browni.sh-black,  but  at  the  extreme  tip,  yel- 
low ;  the  yellow  tibiiE  are  slender,  beset  with  very  short  black 
hairs,  which  are  somewhat  more  erect  on  the  middle  libi*.  Tarsi 
plain,  slender,  brown,  somewhat  more  brownish-yellow  towards 
the  basis  ;  the  four  anterior  ones  are  much  longer  than  the  tibiie, 
and  their  first  joint  much  longer  than  the  four  following  joints 
taken  together  ;  the  hind  ones  are  hardly  of  the  same  length  with 
the  tibia),  but  their  first  joint  is  likewise  perceptibly  longer  than 
the  four  following  joints  taken  together.  Teguhe  l)ordered  and 
ciliated  with  black.  AVings  brownish-ltlack,  the  last  third,  the 
hind  margin,  and  the  greatest  part  of  the  anal  angle  grayish- 
hyaline  ;  the  fore  margin  of  the  wing  is  fringed,  almost  ciliated 
with  comparatively  long,  minute  hairs ;  the  hind  transverse  vein 
has  a  very  oblique  position. 

Hah.  Mexico.     (Collect.  Winthem.) 

B.  Wings  hyaline  with  two  l)lack  bands  connected  on  the  .anterior  margin. 

2.  P.  sipllO  Say.  %  and  9. — Chalyheus  vel  viridis,  rarius  aureo- 
viridis,  nitidissiniiis,  alarum  fasciis  dualius  nigricantilius,  aiitice  con- 
junctis  et  po.stii-e.  abhroviatis,  facie  nuda,  pedibus  iu  iitroijiie  sexu  tlavis, 
maris  metatarsis  interniediis  non  ciliatis. 

Steel-blue  or  green,  seldom  golden-green,  very  shining  ;  wings  with  two 
l)lMi:kish  bands,  connected  in  front  and  abl)reviated  behind  ;  face  with- 
out liairs  ;  feet  yellow  in  both  sexes  ;  the  tirst  joint  of  the  middle  tarsi  of 
tlie  ^  not  ciliated.     Long.  corp.  0.121— U.:24.     Long.  al.  t).li2— 0.'.24. 


1  '  '.'  "  t 

IH 

ff 

m 

pH 

fe^lf'^ 

"■ '    ;  • 

4 

■    ■"     i'l     ' 

\^ 


i-. 


\) . 


■  •   '    '    '  '■ii«*^..  9  I:' 


':i.i'^if^:'|- 


248 


DIPTKHA  OF  NOKTir  AMKIUCA. 


[part  n. 


Syn.  DnUcfiopifi  si'jihn  Say.  Journ.  Ac.  Pliilad.  Ill,  S4, 1. 
Psi/o/)tis  sijilio  WiKDKMA.N.N,  Aiisirt.  ZweiH.  II,  218,  9. 
Psilo/ms  (jcmmifir  Walkku,  List,  III,  t)4G. 
Psiliipiis  sipho  LoEW,  Neue  Beitr.  VIII,  83,  1. 

Saturate  green,  often  bluish-green,  steel  or  even  purplish-hluo, 
seldom  gokl-green,  always  very  shining.  Faee  without  hairs,  its 
ui)i)er  part  but  little  convex  and  separated  from  the  lower  part  by 
a  shallow  impression.  Proboscis  brownish-yellow.  Antennte 
black ;  the  pubescence  of  the  second  joint  only  of  moderate 
length;  third  joint  rounded;  arista  distinctly  dorsal;  not  par- 
ticularly long.  Abdomen  with  black  transverse  fascia;  on  the 
fore  margin  of  the  segments,  which  are  so  narrow  in  the  j,  tliiit 
they  arc  entirely  concealed  beneath  the  hind  margin  of  the  pre- 
vious segment ;  in  the  J*  the  hind  segments  of  the  abdomen  are 
often  gold-green;  the  same  is  sometimes  also  the  casein  the  9, 
where  this  gold-green  color  sometimes  also  reaches  the  anterior 
segments  of  the  abdomen.  The  pubescence  of  the  abdomen  is 
generally  black;  in  the  male  it  is  whitish  upon  the  first  segment, 
on  the  basis  of  the  second  and  of  the  third  segments,  and  on  the 
anterior  half  of  the  lateral  margin  ;  in  tiie  9 ,  the  pubescence  of 
which  is  in  general  shorter,  minute  whitish  hairs  arc  to  be  found 
only  upon  the  hrst  segment  and  on  the  anterior  part  of  the  lateral 
margin,  which  hairs  are  less  perceptible  than  in  the  (-f .  The  black 
bristles  before  the  hind  margin  of  the  segments  of  the  abdomen  arc 
only  of  a  moderate  length.  Ilypopygium  small,  black ;  lamelhc 
small,  black  or  brownish-black,  ciliated  Avith  black.  Fore  coxie 
yellowish,  with  a  delicate  white  pubescence  and  a  few  black  bristles 
near  their  tip.  Middle  and  hind  co.Tic,  including  the  trochanter, 
dark.  Feet  yellowish  ;  all  the  femora  are  beset  with  delicate, 
minute  whitish  hairs  upon  the  under  side,  which  are  distinctly  longer 
in  the  J*  than  in  the  9  ;  the  fore  femora  have  a  row  of  four  to  five 
black  bristles  upon  the  hind  side  ;  on  the  middle  and  hind  femora  a 
few  thorn-like  minute  black  hairs  are  to  be  found  upon  the  hind  side, 
as  well  as  uv)on  the  anterior  side  before  the  tip.  Fore  tibite  entirely 
yellow ;  in  both  sexes,  three  snmll  bristles  are  generally  to  be  found 
upon  the  upper  side ;  and  whilst  there  Jire  likewise  but  three  upon 
their  outside  in  the  9  ,  in  the  (^ ,  about  six  much  longer  biiotles  are 
usually  extant.  The  fore  tarsi  are  yellow  at  the  basis,  but  be- 
come black  already  before  the  end  of  the  first  joint ;  in  the  ^^  iiwy 


rsiLopus. 


240 


ni'(  once  and  a  liulf  llic  l('ii;.r;li  of  llic  tibiir,  in  tlic  j  only  iiI)out 
once  and  a  third;  tlicir  lii>t  joint  is  very  elun<;'at('(l,  so  liiat  it  is 
much  lonjiXT  than  tho  rcnniininji' joints  tal<cn  to<i'cthcr;  Ix'sidcs  llio 
usual  short  pulK'sccncc,  wliich  is  nincli  lon^'cr  upon  tlic  hind  side  in 
tlio  ^  tiuin  in  the  9,  it  has  a  few  small  hlack  Uristlcs  u)»on  tlic  under 
side.  .Middle  tihiso  in  tho  9  with  l»ut  a  few  hiack  liristles  nj)on 
the  ni)iier  and  front  side  ;  in  the  J*  besides  with  a  row  of  erect 
bristles  inserted  almost  on  the  under  side  and  running;  from  the 
base  to  the  tip.  Middle  tiirsi  of  the  same  coloring;'  as  tho  foro 
tarsi,  still  Iho  black  colorinu'  Ix'u'ns  tr'cnerally  somewhat  earlier  in 
tho  J*  ;  thoy  are  about  once  and  a  half  the  length  of  the  tiltia'  ; 
the  first  joint  alone  is  not  nun-li  shorter  than  the  tibia  and  nearly 
l.V  the  length  of  the  f(dluwinp^  joints  taken  together;  beside  tho 
usual  minute  hairs,  it  has  upon  tho  under  side  about  seven  short 
black  ])ristles,  upon  tho  anterior  side  one  or  two  somewhat  longer 
ones;  tho  middle  tarsi  of  the  9  are  of  the  same  structure,  but  some- 
what shorter,  and  the  small  bristles  on  their  first  joint  are  snndlor. 
Hind  tibiai  at  the  e.xtromo  tip  black,  wit'li  the  ordinary  pubescence, 
upon  tho  outside  with  three  or  four  bristles;  hind  tarsi  shorter 
than  the  hind  tibiio,  entirely  black,  the  lirst  joint  once  and  a  half 
the  length  of  all  the  following  taken  together,  which  are  of  a  gra- 
dually decreasing  length.  The  small  teguhe  with  Jilack  border  and 
with  long  black  cilia,  llalteres  yellowish  ;  the  liasis  of  the  ix'duncle 
blackish.  Wings  hyaline  ;  costa  with  the  usual  short  pul)escence  ; 
the  black  picture  not  very  extended ;  the  two  blackish  bands 
have  no  connection  Ijchind  the  fourth  longitudinal  vein  ;  the  lirst 
band  is  not  seldom  interrupted  immediately  before  the  fourth 
longitudinal  vein,  and  the  second  is  never  e.xtendod  as  far  as  the 
ai)e.\'.  Hind  transverse  vein  moderately  obliipie,  somewhat 
sinnated  ;  tho  basis  of  the  anterior  branch  t)f  the  fourth  longitu- 
dinal vein  is  nearly  twice  nearer  to  tin;  nuirgin  of  tho  wing  than 
tho  hind  transverse  vein.  This  branch  has,  at  its  origin,  a  some- 
what recurrent  direction,  and  turns  from  there  towards  tln^  mar- 
gin at  a  right  angle,  which  is  rounded  at  the  tii»;  it  reacln's  the 
margin  somewhat  l)efore  the  apex  in  the  innnediatc  proxinuty  of 
tho  tip  of  the  third  longitudinal  vein. 

Hah.   Pennsylvania,  Georgia,  Virginia,  Illinois,  etc. 

Ohxrrvalion  1. — I  possess  a  ^ ,  which  is  distinguished  fmiii  all 
others,  tho  row  of  bristles,  peculiar  to  tho  sex,  upon  the  lower 
part  of  tho  front  side  of  the  middle  tibiaj  being  nmch  closer,  and 


ijh 


'  I  ■    •! 


'■% 


2r)0 


]>Jl'Ti;ilA  dl"  NOllTII  AMKlUl'A. 


[part  ir. 


Ix'iiijr  hIso  proloiifjcd  over  the  lirst  Joint  oC  llio  larsi,  wlicro  tlio 
brislk's  are  iiiucli  sliorti-r,  and  tlicrc  arc  altout  ten  Itrislk-s  in  all. 
As,  in  otiior  r('sj)(.'cts,  this  specimen  anTces  itcrlcctly  with  iho 
others,  and  as  llio  row  of  bristles  in  (|ne>tion  seems  liable  to  vary 
as  to  its  closeness,  1  take  this  sin'cimen  Ibr  a  variety  of  P.  kiji/io. 

OhKervation  '2. — It  has  already  been  noticed  above,  that  the 
sjiecies  described  as  J\  si/i/io  by  Mactjuart,  is  not  synonynions 
with  the  present  one.  Walker,  in  the  Lisl  of  Dipt.,  lias  also  u 
]'.  sipho,  but  as  he  (piotes  Mac(piarl's  J\  t<ip/i()  unionj:;  the  .syno- 
nyms, anil  as  his  own  J',  (/rmiiti/'cr  seems  to  l)o  nothiim;  else  but 
Iho  J',  sijtho  Say,  it  becomes  very  donbtl'id  whether  the  J',  fiiji/io 
of  the  List  of  Dij'f.  is  identical  with  Say's  species;  this  is  the 
reason  why  it  has  been  omittcil  in  the  synonymy.  IJy  all  means, 
as  Mr.  Walker  does  not  descrilie  his  species,  it  is  a  imitter  of 
indilVerence  what  he  nniy  have  meant  by  it. 

Ohfcrcotion  3. — The  Imperial  Museum  iii  Vienna  contains  two 
specimens  of  r.  si])I>o  Say,  marked  as  beinjj;  from  New  Holland. 
As  there  are  also  two  specimens  of  1'.  palletK^  with  a  similar 
habilal,  one  is  juslilied  in  supposinj^  that  these  indications  are 
erroneous. 

3.  !•.  scatoer  Loew.  %  . — Clialybeus  vd  viridis,  nltidissimus,  alarum 
I'asfiis  duabus  iiigricuintil)us,  antice  conjiuu-tis  et  postice  al)breviatis, 
faitic  mida,  la'dihus  in  iitnujiic  sf.\u  tlavis,  tarsoium  intermediorum  niarij^ 
ai'tiitulo  primo  iu  latere  aiiteriore  pilis  niiuutis  erectis  confertiiu  ciliato. 

Steel-blue  or  green,  very  shining  ;  wing.s  with  two  blackish  bands,  which 
are  connected  In  front  and  abbreviated  behind  ;  face  without  hairs  ;  feet 
yellow  in  both  sexes,  the  liist  joint  of  the  middle  tarsi  of  the  %  closely 
ciliated  upon  the  front  aide  with  short,  erect,  uiinute  hairs.  Long.  corp. 
0.2-4.     Long.  al.  0.24. 

Sv.v.  J^ilnpus  scabir  Loew,  Neue  Beitr.  VIII,  8.J,  2. 

This  species  is  strikin<rly  like  J\  sipho,  l)ut  it  cannot  be  taken 
for  its  variety  in  conse(pience  of  the  structure  of  the  middle  tarsi. 
The  above  mentioned  row  of  l)ristles,  which  the  ^  nt  P.  sipho  has 
ujion  the  front  side  of  the  miihlle  tibiie,  exists  also  in  P.  .scaher, 
but  is  more  sparse;  towards  the  end  of  the  tibise,  it  is  interrupted, 
as  it  evidently  api)ears,  not  in  coiisc(|m'nce  of  the  loss  of  some 
siujrlc  l)ristles.  The  lirst  joint  of  the  n)iddle  tarsi  has  no  bristles 
whatever  upon  the  front  side;  instead  of  that,  there  are  sonuMpiite 
short,  stiir,  erect,  minute  hairs  of  a  blackish  color,  which  form  a 


tK'  ''''■ 


S'L    >.. 


^  a^ 


PSIL0PU8. 


261 


very  rough  fringe ;  towards  the  end  of  the  joint  they  are  decreasing 
in  length,  and  can  hardly  be  distinguished  at  the  end.  The  hind 
tarsi  of  the  only  specimen  which  I  possess,  seem  to  be  somewhat 
shorter  than  those  of  a  mule  of  P.  xijtho  of  the  same  size.  In  all 
other  characters  the  agreement  is  coni|)lete. 
IJab.  I'enn.sylvania.     (Von  lleyden.) 


4.  P.  patitolilaf  MS  Say.     %  and  9  . — Obscure  viridis,  iiitidus,  alarum 

fasciis  duabus  iii^'ris,  antice  conjunctis   et   po.stiuo   abbreviatis,  facie 

pilosil,  pediburf  nigri.s. 
^  ,  lliilteribuii  iiigris,  primo  tarsorum  anticorum  articulo  elongate  et  api- 

ceiu  versus  in   latere  exterioro    setis  uigris  armato,  articulis  duubus 

sequentibus  brevissiniis. 
9 .  Ilalterum  capitulo  llavo. 

Dark-green,  shining  ;   wings  with  two  black  bands,  which  are  connected 

in  front  and  shortened  behind  ;  face  hairy ;  feet  black, 
^ .  Ilalteres  black,  the  first  joint  of  the  fore  tarsi  elongated,  and  towards 

the  tip,  upon  the  outside,  beset  with  black  bristles,  the  two  following 

joints  extremely  short. 
5  .  Knob  of  the  halteres  yellow.     Long.  corp.  0.20 — 0.23.     Long.  al.  0.20 

—0.23. 

Syn.  Do!u:hopu-<  patlbulntus  Say,  Journ.  Ac.  Philad.  Ill,  87,  7. 
JVilopun  patihulfitus  Say,  Journ.  Ac.  Philad.  VI,  1(J8,  2. 
Psilopus  putibit/atus  Wikdemann,  Auss.  Zweifl.  II,  225,  27. 
Pxilopiin  (uiuiliis  Waf.kkr,  List,  etc.  Ill,  G48. 
P.-iili'pus  iiijirilus  Wai,kek,  List,  etc.  Ill,  049. 
I'silopus  patibul(iln.t  LoEW,  Neue  Beitr.  VIII,  85,  3. 

j\[(de.  Bright,  shining,  dark-green,  often  steel-blue,  particu- 
larly the  head,  the  posterior  part  of  the  thorax,  the  scutellum  and 
also  the  front  and  hind  segments  of  the  abdomen.  Proboscis  and 
palpi  black.  Face  beset  with  long  whitish  or  pale  fallow-yellow- 
ish hairs,  but  little  dusted.  Second  joint  of  the  antenme  with 
rather  long  bristles,  the  tliird  joint  small  and  rather  rounded. 
Arista  distinctly  dorsal,  of  moderate  length.  Front  at  the  upper 
eye-corner  with  a  long,  black  pubescence.  Upper  side  of  the  thorax 
and  the  scutellum  with  long  black  bristles.  Pleurjc  black  Avith  a 
green  reflection  and  slightly  dusted  with  white,  which  gives  them 
a  somewhat  grayish  appearance.  Abdomen  shining  green,  the 
first  segments  often,  tlie  two  last  generally,  purplish-blue  ;  on  the 
anterior  margin  of  the  single  segments  there  are  black,  not  very 


im 


252 


DIITKIIA  OF  SOUTH  AMIMtlCA. 


[I'Airr  ir, 


slmrply  limited  tnuisvcrst'  Itiiiids,  wliicli  arc  bi'diidrr  tipnii  tlio 
hind  s('i>'iiK'iits  llinii  upon  tin'  iiiitcrior  ones.  Pultcsct'iicc  of  ilio 
ultdiiiiicii  hltiok,  whitish  only  uii  the  iiiiterinr  part  of  tho  latcrul 
iiiarjiiii  and  (if  tlic  venter;  tiie  hiaeli  lii'istles  i)ef<ire  tlie  hind  niiir- 
jrin  of  tlie  sinfi'ie  sefi'ments  are  of  a  consideralile,  hut  not  striklnji; 
len^'th.  Tile  snuill  liypopy<riuui  is  hlaik  witli  sundl  lilaek  lanu'lhe. 
Co.\ie  and  feet  l)laek,  tlu,'  fore  til)iie  only  iu  ininiatnro  spccinicns 
browuish-bhiek  ;  foru  coxie  and  all  femora  with  a  {rreen  rederiimi, 
llio  lore  eoxio  havo  a  rather  e(mspicnoiis  white  pnliesemee,  amonif 
which  are  iii>erted  some  hlaek  bristles;  on  the  under  side  of  the 
femora  there  id  a  loiiji"  erect  puliescence,  which  has  only  very  near 
their  tip  a  black,  otherwise  everywhere  a  whitish  coloriuff.  'Piliiie, 
besides  the  usual  short  black  pubescence,  with  a  moderate  iiuinber 
of  black  bristles,  which  nuiy  lie  easily  overlooked  on  the  hind  tibia*, 
as  they  are  rather  short  and  to  be  found  only  uixiu  their  out>ide. 
First  joint  of  the  f(jre  tarsi  •  \tremely  elongated,  aliout  as  Ioiil;'  as 
the  til)ia'  and  nearly  twice  ti  leuj^th  of  the  four  followin<>;  joints 
taken  together;  ui)on  the  outside,  towarils  the  tip,  frin<i'ed  wiili 
black  bristles;  the  second  and  third  joints  arc  of  ecpial  lenjrth,  both 
very  short,  taken  t  tji'cther  only  us  hjug  as  the  fourth  joint  ;  the 
lil'th  joint  distinctly  shorter  than  the  fourth,  but  longer  than  the 
second  and  third  taken  singly.  Middle  tarsi  plain,  their  lirst 
joint  nearly  as  long  as  the  tii)ia  and  at  least  If  times  the  Iciiglli 
of  the  four  following  joints  taken  together;  upon  the  front  side 
with  a  short  and  delicate  fringe-like  pubescence  of  a  black  color; 
the  following  joints  of  a  gradually  decreasing  length.  Iliud  tarsi 
considerably  shorter  than  the  tibial,  their  tirst  joint  hardly  once  and 
a  half  the  length  of  the  four  following  taken  together,  which  gra- 
dually decrease  in  length  and  arc  not  thi<'kened.  Halteres  black- 
ish-l)rowu,  sometimes  more  i)ale  dingy-yellow.  Teguhe  with  a  broad 
black  margin  and  with  long  black  cilia.  Wings  hyaline  with  the 
usual  siphou-like  black  picture,  both  bands,  which  f(jrm  this;  pic- 
ture, are  perpendicular,  liroad,  always  connected  on  the  fore  nuir- 
gin,  au<l  generally  u\m\\  the  fourth  longitudinal  vein,  abbreviated 
before  the  hind  margin  ;  the  lirst  longitudinal  vein  reaches  nearly 
to  the  middle  of  the  fore  margin  ;  the  anterior  branch  of  the 
fourth  longitudinal  vein  diverges  from  it  at  an  angle  of  TO  to  80° 
and  turns  afterwards  at  a  rounded  right  angle  towards  the  mar- 
gin, which  it  roaches  before  the  extreme  apex,  near  the  tip  of  the 


'lii 


PSIl,(»PfS. 


2').3 


.»,i 


tliinl  loiijfitudiiial  vein  ;  the  Iiiiul  truiisverse  vein  fioracwlml  olilinuo, 
not  (listiiH'tly  siiiimtcfl, 

Fcmah:.  It  rosi'ml)lt'S  thu  J"  in  the  roloring  of  the  Ixxly  and 
the  f(H'(,  as  iiNo  in  tlio  iiciiriitioii  ui,il  the  pictiirr  of  tlii' wiiijfs.  Its 
fiicu  lias  a  iiiucli  denser  wliiie  dust.  Tin;  Itristles  on  tlie  seenrid 
jdiiit  iif  the  aiiteiiiiiL'  are  euiisi(lern''ly  shorter,  tin  l)ri>lh'S  upon 
thorax  and  seiiteUuni  are  likewisf  of  a  lesser  hiifftli  and  tlut>o 
1)elbre  the  inei>'ires  of  the  alHhtineu  still  luueh  sliorter  than  in  the 
^ .  The  black  Imuds  of  the  ahdonieii  are  not  apparenl  when  tiie 
hitler  is  not  more  stretched  out  tiiau  usual  ;  still  the  narrow, 
sharply  limited  hind  nmrji-ins  of  the  seji'uieiils  appear  rather  lihni. 
in  a  certain  lifjfht.  Feet  plain  ;  pulieseenee  and  l)ri.-iles  of  the 
femora  and  tibial  as  in  the  (^ ,  Itiit  shorter.  Tarsi  shorter  than  in 
the  ^  ;  fore  tarsi  at  least  onee  and  u  third  tin'  lenji'tli  of  the  tihiie, 
the  lirst  joint  aI»out  onee  and  a  half  the  length  of  the  tour  follow- 
in<r,  which  are  of  a  decreiisinu-  lenu'th  ;  upon  its  outside  without 
bristles,  ^liddle  tarsi  distinctly  longer  than  the  tibia",  their  lirst 
joint  about  1.^  the  length  of  the  four  following  taken  together; 
hind  tarsi  distinctly  sliorter  than  the  tibia-;  their  lirst  joint  l)ut 
little  longer  than  the  four  following  taken  together,  the  length  of 
which  diminishes  rather  rapidly.  Peduncle  of  thehalteres  brown- 
i>li-black,  knob  yellow. 

H(ib.  Chicago,  Nebraska,  etc.  [Comnuju  everywhere  in  the 
.Mi(hllo  States,  O.  S.] 

Ohserrafion. — Say  mentions  the  occurrence  of  P.  po/ihuhifiis 
in  Mexico.  The  specimens  seen  by  him  nuiy  jxrhaps  l)elong  to 
the  following  species,  which  is  frecpuMit  in  Afc-'xico,  and  he  may 
have  been  mistaken  about  their  identity  with  his  P.  ]>atibiilatHii. 


,K'., 


m 


5.  P.  melampiis    Lokw.     %    and    9.— Viridis,  saopp   ex   clialybeo 

viridis,  nitidiis,  facie  luidil,  ahiruui  farfciis  duabus  nigricantibus,  antice 

coiijuni'tis  et  postice  abbreviatis,  pedibiis  totis  nit^ris. 
'J,.  Abdoiiiiue  fasciis  aequalibus  nigrirf  oriiato,  halterilnirf  e.\  fusco  nigris, 

primo  tarsoruni  antic-orum  articulo  sotis  nigris  armato,  artiouli.s  se(iuen- 

tibiis  duobiis  11011  abbr«viatis. 
9 .  Fasciis  uigris  abdominis  angustis,  subobsoletis,  lialte rum  capitnlo  flavo. 

Green,  often  bluisli-green,  shining,  face  without  liairs;  tlie  two  blackisli 
bands  ui  the  wing  connected  in  front  and  shortened  behind  ;  feet  entirely 
black. 

% .  Abdomen  with  black  bands  of  equal  breadth  ;  halteres  brownish  black  ; 


i    \ 


m 


254 


DIPTKRA  op  XOIlTIf  AMKIITCA. 


[r.AllT  II 


tho  first  Joint  of  tlif  fore  tftrni  lu'Hot  with  blnuk  lirintles,  tlie  two  follow- 

iiiu'  not  fdioi'tt'iicd. 
9.  'I'lio   M.ick   l),iii(lrt  of  tilt)  (ilidoninn  narrow  mid   ratlifr  indistinct ;   tlio 

knol)  (if  thu  haltoreH  yellow.     Long,  corp,  0.17—0.22.     Long.  nl.  0.21 

0.2:i. 
Sv.N.    /'.li/oiiim  mildwiiiis  LoKw,  UitI.  luit.  MonatHchr.  VI,  215,  (iO. 

Mdlr.  Sliiiiiii}^  inctiillic-jrrci'ii,  sonictiincH  partly  Iduisli-frrccn, 
llic  ]M(st('riitr  itiirt  oI'iIk'  n1i<|oiMt'ii  jfciifriilly  stccl-ldiio.  I'mboscis 
iiiid  |iiil|ii  l)lii('lv.  Fiicc  ratliiT  cldscly  (jusfcd  with  white,  liut  with- 
nut  liiiirs.  Aiitcnmc  Ithick  ;  the  second  joint  with  niunerous  unci 
lonj?  black  Itrislies.  Arista  distinctly  dorsal,  of  a  more  tliaii 
moderate  lenirtli.  Front,  iiesides  the  usual  bristles,  with  a  deli- 
eate  pulieseenee,  which  has  near  the  upjM'r  corner  of  the  eve  a 
liluck,  towards  tlio  middle  of  the  front  a  neiirly  whitish  colorinjr. 
Tpper  sid(!  of  the  thorax  and  the  scutellum  with  ionj^  black 
bristles.  Tlenra'  with  a  greenish  rellection  and  dusted  with  white. 
Abdomen  shining  green,  the  antei'ior  segments  often,  the  hindmost 
usimlly,  steel-blue;  on  the  anterior  margin  of  the  single  segments 
there  are  sharply  defined  transverse  bands,  which  are  broader  upon 
the  hind  segnicnts.  Pubescence  of  the  abdomen  blaek,  only  on  the 
anterior  portions  of  the  lateral  nnirgin  and  of  the  venter,  whitish  ; 
the  black  bristles  before  the  hind  imirgin  of  the  single  segments 
are  of  a  considerable,  but  nit  striking  length.  The  small  black 
liypopygium  has  snnill  black  himelhe.  Cnxiv  and  feet  blaek;  fore 
co.\u;  and  all  the  femora  with  a  bluish-green  or  blue  rellection. 
Fore  coxiu  with  a  considerable  whitish  j)ubesceiice,  am<ing  wliicli 
there  are  some  black  l)ristles.  Upon  the  under  side  of  the  femora 
there  is  a  long  erect  pubescence  which  is  whitish  only  verv  iiciir 
the  basis,  otherwise  l>lack.  Fore  tibia*  upon  the  outside  with  a 
row  of  fiMir,  or  at  most  live,  long  black  ))ristles  ;  the  last  of  which 
is  inserted  at  some  distance  from  the  tip  of  the  tibial';  ujton  the 
upjx'r  side  with  three  or  four  (piite  sliort  bristles,  whieli  may  be 
easily  overlooked.  The  pubescence  (tf  the  middle  tibia?  is  some- 
what more  erect  than  that  of  the  fore  and  hind  til)iaB,  and  upon 
the  upper  side,  especially  towards  the  basis,  longer ;  upon  the 
tipper  side  there  are  four  or  five  longer  bristles,  the  la.st  of  which 
is  inserted  at  a  considerable  distance  from  the  tip  of  the  tibiie ; 
upon  the  under  si(h'  are  four  or  five  shorter  bristles  at  erpial  dis- 
tances. The  hind  tibiiB  have,  besides  the  usual  pubescence,  upon 
their  outside  about  six  bristles  at  equal  intervals.     The  rather 


psiropi'fl. 


255 


sIl'IkIci'  fore  tarsi  iilduit  once  ami  u  half  tin;  Icii^lli  of  llif  (iliiir; 
llii'ir  lii'st  j(»iiil  is  niiicli  Idiig-ci"  tlian  tlic  roilitwin;;'  talicii  lnjiM-liii'i', 
ami  is  friii^n'd  ii|m)ii  its  outside  witli  six  or  seven  Imijr  l»ristles, 
insei'te(l  sdiiiewliat  closer  lowanis  its  tip;  the  lour  last  Joints  of 
tlie  fore  tarsi  are  of  a  fi'radiially  deereasiiin'  leiijrth  and  t)f  au  en- 
tirely plain  structure.  Middle  tarsi  plain,  alxmt  once  and  a  lliird 
the  lenu:ih  of  tli*!  tilme,  their  first  joint  aliout  \\  the  lenu'tli  of 
tlie  followini;  taken  top'tlier.  It  has  upon  its  front  and  upper  siilu 
an  exceedingly  short  and  therefort!  not  (piil(;  easily  perccplihle 
frinji'i'-like  lilaelv  pnltcscenee.  Hind  tarNi  sliortei'  than  the  hind 
tiliiic,  the  fonrlli  joint  ultont  !.{  tlie  lenulh  of  the  following; 
taken  to;r<'tlM'r.  Ilalteres  hrownisli-lilaek.  Teji'uhe  willi  a  very 
broad  ithick  inarii'in  and  with  lony  lilack  cilia.  Win^s  liyalino 
with  the  usual  siplion-Iik(!  pi(  tare  j  both  bands  forininfr  this  pic- 
tun;  are  perpendicular,  jicnerally  of  (tnly  ni'.ldle  breadth,  always 
connected  on  the  fore  inarfiin,  sometimes  also  upon  the  fourth 
loufritudiiial  vein,  and  abbreviated  l)efore  the  hind  nniruin  of  iho 
wiuf^s.  The  first  loiiu'itudinal  vein  reaches  somewhat  beyond  tho 
midtlh'  of  the  aiderior  marji'in  ;  the  anterictr  branch  of  the  fourth 
lonji'itmlinal  vein  diveru'cs  at  an  aiijile  of  about  TO",  and  turns 
afterwards  at  a  somewhat.  rounde(l  riu'ht  an^i'lo  towards  the  mar- 
gin, which  it  reaches  before  the  extreme  apex,  near  the  lip  of  tiit* 
third  lon<j:itudinal  vein  ;  the  hind  transverse  vein  rather  oi)li(pio, 
only  little  sinuated. 

Fenuile.  It  resembles  the  ^  in  the  e(dorin<r  of  the  body  and  of 
the  feet,  as  also  in  the  neuration,  and  the  picture  of  the  winj;'s.  The 
glabrous  face  is  dusted  somewhat  closer  ;  the  bristles  on  the  second 
joint  of  the  anlennm  are  distinctly  shorter  than  in  the  other  sex; 
the  bristles  upon  the  thorax  and  scutellum  are  shorter,  and  those 
l)efore  the  posterior  nnirgin  of  the  abdomen  much  shorter  than  in 
the  nmle.  There  is  only  a  vestige  of  a  black  band  on  the  basis  of  the 
segments  of  the  ab(b)men.  Feet  plain.  I'nbesci'iice  upon  the 
under  side  of  the  femora  much  shorter  than  in  the  male.  Fore  tibiiu 
upon  tho  upper  side  generally  with  only  two  short  bristles,  upon  the 
outside  with  three,  but  little  longer  ones.  Hairs  on  the  middle 
tibite  not  longer  than  usual  ;  upon  their  upper  side  there  are 
generally  only  three  black  bristles,  two  near  the  basis  and  one 
beyond  the  middle;  upon  the  under  side  there  are  generally  four 
small  bristles  at  ecpud  intervals.  Hind  tibia'  as  in  the  ^ .  Tarsi 
shorter,  plain ;   the   first  joint  of  the  fore  tarsi   without  bristles 


.1.) '  /,' 


ii-.l 


•■m 


m 


t 


f^'i 


.)<) 


Ull'TKUA  OK  Ndinil  A.MKUICA. 


[I'AltT  ir. 


Hall 


I'lX'S      \VI 


itli    Ijlurlvisli    pL'iliiiicle  luiil  ye 


ildW 


U}i(iM  tlio  (iiU.^kIc 
kii(il). 

Jhib.    Mexico. 

Ohxcmi/iuii  1. — This  si^'cii's  varies  soinewliat  in  tlio  exteiisidii 
of  I  lie  hands  on  tlie  wiiijjs,  still  they  are  never  as  hmad  as  in  /'. 
2>iililnilnU(i^,  but  sonietinios  interrupted  between  the  third  and 
Inurth  lonii'itudinal  veins. 

( )/)sfrffi//\tii  '2. — I  was  in  possession  of  the  j  of  this  spec  ies  a 
U)UiX  tiiiHJ  au'o,  but  allhoujj,'h  convinced  of  its  speeilic  disliiiclne-s 
(vid.  Neue  I5eitr.,  N'llI,  SC),  i  woidd  not  deseribi;  it  withoul  llie 
male.  It  is  easily  (listin,i>'uished  in  both  sexes  from  J\  ixitilxildhi^, 
with  which,  anionu'  the  spi'cies  known  to  nu',  it  has  the  do 


re- 


niblauce,  bv  it^ 


-fni 


abrous  face,  and  besides,  in   the   mah 


diU'erent  structure  of  the  fore  tarsi.  J  presume  that  Say  luis  con 
founded  tliis  .Mexican  species  with  his  J'.  jiaUlndalii^s,  tif  which  h 
savs  he  has  seen  Mexican  si)eeiniens. 


<i.  1*.   pilosiis  Li 


%  .  —V.K.    clialyliuo    viridis,  iiitidus,  aluldii 


fasciirf  at'(jiialil)us  iiigris  oriiato,  alarniii  fasciis  dualiiis  iiimii'aiitilnis, 
aiitice  t'onjunt'tis  et  jiostice  abliroviatis,  tacit;  midil  (.'),  ju'dilms  ini:iis, 
tihiis  aiiticis  tarsoruni(]Uo  interniedioruui  articulo  luiiuo  ti-staccis,  lim-  ft 
tiliiis  intcniU'diis  in  latt  .v'  superiort;  lircviter  ciliatis. 

51iiish-i;n'('n,  shining,  altdonit'ii  witli  ecjual,  l.road,  l)laok  bands  :  tlic  two 
lilackisli  liands  of  tin;  winiis  connectccl  in  fiont,  slioiteiicii  tudiiiid  ;  lacn 
without  liairs  (.')  ;  ft'ct  l)hu'k,  the  fori;  tiliia  and  tlic  liist  joint  ol'  tlic 
iiiiildle  tarsi  hrownish-yeliow  ;  tlio  lattor  and  tlie  middle  til)ia'  niion  Iho 


UplH'l 


(U 


rovidod  witli  sliort  cilia.     Loi 


Lon 


il.  0. 


Syn.   Pxilopiix  ])ilosu.t  LoEw,  Keue  Beitr.,  VIII,  8(5,  4. 


Briirht  <rrceii,  tlie  head,  the  hind  ])art  of  the  thorax,  tlie  scntel- 
liini,  as  also  the  basis  ami  the  tij)  of  the  alulonu'n,  in  the  descril)ed 
si)eciiueu,  more  steel-blue  and  brijrlit  shinin};-.  J'alpi  black  ;  pro- 
boscis l)rowiiisli-vt.'ll'>\v.  Face  rather  doselv  dusted  with  wliite. 
in  the  described  specimon  without  all  ]»ul)escence,  which  howcvei 
may  have  been  rubbed  oil'.  Second  joint  of  the  auteniuo  upon  the 
under  sido  witli  rather  long,  upon  the  ui)per  side  with  shorter 
bristles,  these  curved  forward;  third  Joint  snniil,  rounded;  aii^ta 
distinctly  dorsal,  of  medium  length.  Front  with  a  black  piiliescence 
in  the  upper  comer  near  the  I'ye.  Thorax  and  sculeliiim  with 
rather  long  black  bristles.     I'leuriu  black  with  a  greeu  relleetion, 


I'SII.dl'IS. 


•)( 


"•.iincwluit  ,uriiy,  liy  liciiiL;'  .-I'u'Iidy  diislcd  witli  wliilisli.  PiiIh'scciico 
ci"  tin;  alidomcii  iiioi'o  ('[(ci  aiul  lonii'tT  ihaii  ii.-inil,  hhidv,  only 
v.liitisli  1)11  llic  [interior  piirt  nl'  llic  lalcral  iiiar,u-iii  and  i>\'  llic  vciilcr. 
Tlio  .small  liypopy.u'iiim  lilack,  with  liiackisli-hrowii  laiiulhi'.  ( 'o.xa: 
and  I'l'ct  black  ;  <'().\ii!  with  a  firccnisli  icllcctidii,  raliicr  closely  dusted 
with  wliitu;  the  forciiiost  with  a  distinctly  whitish  piiliescencc  and 
with  some  stout  lihick  ln'istlcs.  ruder  sidi-  d'  t!ie  t'eniura  with  a 
delicate,  ioiit^,  erect  |inl)escencc  which,  (|iiite  iicai'  the  lip  of  the 
leiiiora,  has  a  hlack,  otiu'rwise  everyu  here  a  whit  ish  cidorin^-.  I'"ure 
tihiii'  yellowish-hrowii,  upon  the  upper  side  dark-hniwn,  and  near 
the  Itasis  almost  lilack,  npiti  the  ontside  rriii,u:ed  with  not,  very  nu- 
iiicroiis,  liut  proportionally  loiiu'  black  bristles.  .Middh;  tibia;  lilack. 
oidv  vellowish-browii  at  the  end  oi'  the  inner  side,  ciliated  niton 
Ilic  iVont  si(h!  with  a  reundar  mw  ol'  inodcrMtcly  lonu'  black  bristles  ; 
upon  the  upper  side  Irinu'cd  with  moderately  loiiji;  and  somewhat 
erect  black  hairs,  upon  the  first  third  of  the  hind  sidt;  with  some 
moderately  lonj^  black  bristles,  !it  the  tip  with  three  loiiji'cr  black 
liristles,  of  which  oni;  is  inserted  on  the  inner  side,  tlu!  two  others 
upon  the  I'ront  side;.  Hind  tiliia;  entirely  black,  rather  loiiir,  with 
somewhat  coarse  Idack  hairs  and  a  l'cv\  short  lilack  bi'istles,  which 
are  inserted  lietwceu  the  upper  and  the  hind  side.  Fore  tarsi  slender, 
nearly  twice  the  leiiji'th  of  the  tibia;;  the  lirst  joint  alom;  is  some- 
what loiiii'er  than  the  tibia  and  about  once  ami  a  third  the  lenjith  of 
the  four  following  taken  to.ti'cther,  tho  lenu'th  of  which  is  rapidly 
decreasing  ;  no  unusual  pubescence  or  bristles  are  to  lie  seen  on  the 
fore  tarsi.  Middle  lai'si  twice  the  h'ligth  of  liie  tiiiia-;  their  lirst 
joint  alone  much  loiiu'cr  than  the  tibia,  about  once  and  a  half  the 
length  of  the  four  following  taken  together,  brownish-yellow, 
straiglit,  somewhat  stouter  than  usual,  upon  its  upjier  side  regularly 
cilialeil  with  erect,  iiiinnte,  black  hairs  ;  the  four  last  joints  black,  of 
decreasing  lengtli.  Hind  tarsi  entiridy  black,  much  slnu'ter  than 
thetibiiu;  first  joint  once  and  a  half  the  length  <if  the  four  follow- 
ing taken  together;  second  joint  aliout  as  long  as  tin;  three 
following  taken  togellier  ;  these  are  rather  short,  of  almost  ecpiul 
length  and  somowliat  flattened,  so  that  the  end  of  tlie  hind  tarsi 
looks  somewhat  stouter  than  iismil  Halteres  black  ;  tegnhe  with 
a  broad  bla<'k  liorder  and  h»ng  Idaek  cilia.  Wing>  liyaline,  propor- 
tionally larger  than  in  /',  fKitihuldliiH  with  the  usual  siphou-like 
black  ]iiettire  ;  tiie  two  liliick  bainis  not  particularly  broad,  as 
usual,  shortened   l)eliind,  only  coiineeteil  (Mi  the  fure  margin  ;   the 

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258 


DII'TERA  OF  NOHTII  A:\IKRICA. 


[PAKT   II. 


anterior  branch  of  tlic  fourtli  loniritiuliiial  vein  divorg'os  from  tliis 
at  an  aiiprle  wliich  a})j»roaolii's  a  riu'lit  oiio  and  turns  iiftcrwarils 
towards  the  niarfrin  at  a  rounded  aii<rh',  wliich  is  ))ereej»tilily 
larger  tnan  a  rigiit  one  ;  it  reai'lies  tiie  margin  Itei'oro  the  npex 
near  the  tip  of  the  third  longitudinal  vein  ;  posterior  transverse 
vein  ol)li(pie,  distinctly  sinuated. 
llab.   Culja.     (lliehl.) 

T.  F'.  jllCUlldUS  LoEW.      %  and   9- — Viriilis,  vfl  ex  viridi  chalyl'pns, 

iiitidurt,  alarum  fasciis  dualius  nigricautibus,  antice  conjunctis  et  pos- 

tice  abbreviatis. 
^  .   Abdoinino  fasciis  latioribns  nipris  ornato,  lialteribns  fn«cis,  coxis  jipdi- 

bus(nie  iiigris,  tibiis  anterioribu.-;  tarsomuiiinn  anticoruni  articulo  juinn) 

flavis,  tibii.s  posticis  ex  iiigro  fnscis. 
9.   Abdominis    fasciis    nigiis   angustissimis    obsoletis,    halteribus,  cfixis 

anticis  pedibusque  tlavis,  genibiis  posticis,  tibiariuii  posti(;aruni  diiiii<lio 

apicali,  tarsoruin  anteriornni  arliculis  quatuor  ultiiuis,  tarsis  deni'iuu 

posticis  totis  ex  uigro  fusuis. 

Green  or  green-bine,  shining  ;   the  two  blackish  bamls  of  the  wings  coii- 

nei'ted  in  front,  shortened  behind. 
% .   Abdomen  with   broad    black   bands  ;   halteres   brown,   coxa;   and  feet 

black,  the  four  anterior  tibiffi  and   tin!  first  joint  of  the  two  fore  tarsi 

yellow,  the  two  hind  tibiae  blackish-'"  :)wn. 
9.   The  black  bands  of    the  abdoin;'.  very  narrow  and   indistinct;   hnl- 

teres,  fore  coxa;  and  feet  yellow,  the  knees  of  the  bind  feet  and  the  ajiical 

half  of  tht  hind  tibiaj,  tlie  four  last  joints  of  the  four  anterior  tarsi,  ami 

the    whole    posterior    tarsi   blackish  brown.     Long.    corp.    0.15 — li.iiO. 

Long.  al.  0.18—0.20. 

Sv.N.  Psilo/iiis  sijtho  Macquart,  Dipt.  exot.  TI,  2,  110.  Tab.  XXI,  Fig.  1. 
PtiUujiimJiiruiKhis  LoKW,  Neue  Reitr.  VIII,  87,  5. 

MaU'.  Bright  green,  tlie  head,  the  hind  jiart  of  the  thorax,  tiie 
scutellum  and  the  basis  of  the  altdomen  more  steel-blue  in  the 
described  specimen.  Palpi  black.  Proboscis  yellowish-brown. 
Face  without  hairs,  moderately  dusted  with  white.  Bristles  upon 
the  second  joint  of  the  anteniuii  and  tlie  arista  not  very  long,  the 
latter  distinctly  dorsal.  Front  with  a  scattered  wlii'.  imbescencc. 
Thorax  with  but  moderately  long,  scutellum  with  1  mger  bhick 
bristles.  Pleurte  black  with  a  green  reflection  aii'i  1  .ither  closely 
dusted  with  white.  Abdomen  with  iilack  bands  at  the  basis  of 
the  single  segments,  which  are  broader  on  the  hind  segments  than 
upon  the  anterior  ones.    The  ^cattere(l  pubescence  of  the  abdomen 


V 


rsiLons. 


259 


lilack.  wliitish  only  on  tlic  anterior  juirt  of  lln'  lateral  niar<riii  and 
of  tilt'  vontcr.  'I'lio  l)la('k  liri.-tlt's  bctori'  tlic  iiind  maruiii  of  tin' 
siiifrk'  scjrinciits  of"  a  very  moderate  length.  Tlie  very  small  liypn- 
pytrinni  Idackisli  ;  the  lilaekish-brown  lanielhe  very  narrow,  nearly 
lilit'orni.  Coxa;  l)laek  or  Itro\vnish-l)laek,  somewhat  dusted  with 
white,  the  foremost  with  a  rather  distinet  white  juilx'seenee  and 
with  a  few  black  l)ristles.  Femora  black,  with  a  green  reflection, 
the  extreme  tip  of  the  foremost  ones  yellowish,  that  of  the  hind  ones 
brown  ;  their  lower  si<le  fringed  with  niinnte,  erect  whitish  hairs, 
which  are  much  more  scarce  ami  longer  on  the  hind  femora.  The 
fore  femora  have,  upon  their  hind  side  near  the  tij),  three  successive; 
black  liristles.  Fore  til)ia)  yellowish,  upon  the  first  half  of  their 
hind  side  with  three  rather  eonsideral)Ie  bhick  liristles  of  a  decreas- 
ing lengtli.  Middle  tibiie  yellowish,  with  a  few  i»lack  bristles  at 
the  tip,  otherwise  only  with  some  very  short  minute  l)lack  l»ristles. 
Hind  tiliia' daik-brown,  with  the  usual  black  hairs,  i-'arly  without 
any  apparent  bristles.  Fore  tarsi  slender,  over  IH  the  length  of 
the  tibia> ;  their  first  joint  is  yellowish-brown,  darker  at  the  tip 
and  not  tpiite  as  long  as  the  tibite,  also  hardly  longer  than  th(! 
four  following  joints  taken  together;  it  has  upon  its  hind  side  three' 
rather  considerable  bristles  of  increasing  length;  the  four  follow- 
ing joints  of  the  fore  tarsi  are  l)lackisli-l)rowu,  more  yellowish-brown 
at  the  basis,  at  least  once  and  a  half  the  length  of  the  tibia' ;  their 
first  joint  nearly  as  long  as  the  tibiie  and  once  and  a  third  the  h  ngth 
of  the  following  joints  taken  together,  which  are  of  a  decreasing 
length  ;  no  unusual  pubescence  or  l)ristles  on  the  the  middle  tarsi. 
Hind  tarsi  brownish-ldack,  distinctly  shorter  than  the  tibia";  first 
joint  hardly  longer  than  the  four  following  joints  taken  together; 
the  length  of  the  l-atter  is  rapidly  decreasing  Ilidteres  dingy- 
brown.  Tegnhi'  with  a  narrow  black  margin  and  l)Iack  cilia. 
Wings  hyaline  with  the  usual  sii)hon-like  blackish  ])icture;  the 
two  bands  are  peritendie'ida**,  of  medium  breadth,  still  rather  dis- 
tant from  each  other,  connected  only  on  the  anterior  margin  ;  tin' 
anterior  lirancli  of  the  fourth  longitudinal  vein  diverges  from  it  at 
an  angle  of  about  1^)°  and  turns  afterwards  towards  the  nmrgin 
of  the  wing  at  a  b>it  little  rounded  angle  ;  it  reaches  it  liefore  the 
apex,  near  the  third  longitudinal  vein  ;  jiosterior  transverse  vein 
moderately  obrujue  and  nearly  straight. 

Female.     Face  likewise  without  hairs.     The   bristles   on  the 
second  joiut  of  the  aatennai  much  shorter  than  in  the  male ;    the 


! 


^m* 


.(:i 


<)■ 


200 


niPTKRA  01   NOllTII  AMEUICA. 


[part  II. 


ar'.ita,  tlic  bristles  ii])on  tlie  tliorax  and  itjion  the  Hcutolluin  are 
iisu  distinctly  sliurtor,  those  liet'ure  tlie  hind  murgiii  of  tiie  se<>-- 
mcnts  of  the  abchtinen  much  sliorter  than  in  the  male.  Transverse 
1)auds  at  the  Ijasis  of  the  segments  of  the  ul)donien  are  iircscnt, 
hilt  very  narrow.  Fore  coxa-  yellow,  with  a  whitish  i)ul)esc('ne(' 
and  a  i'^^w  black  bristles.  Middle  and  hind  coxuj  black  (tr  black- 
ish-brown. Femora  yellow,  the  extreme  tij)  of  the  hind  IVnioia 
dark-brown,  the  under  side  of  all  beset  with  very  short  minute 
whitish  hairs;  on  the  hind  side  of  the  fore  femora  there  are  only 
ii  \'itw  minute  black  hairs  near  the  tip,  itut  no  bristles.  Tibiie 
yellow,  the  extreme  basis  and  the  apical  half  of  the  hind  ones 
brown  ;  the  fore  tibiic  near  the  basis  with  a  small  minute  bristle 
upon  the  upper  side  and,  farther  towards  the  midille,  with  two  such 
bristles  upon  the  hind  side.  The  middle  tibite  have,  besides  the 
])ristles  at  the  tip,  a  few  more  bristles,  which  are  longer  tliiin  In 
the  male.  Hind  til)iie  U[)oii  the  outside  with  two,  'xt  the  utmost 
with  three,  quite  short  black  bristles.  Fore  tarsi  about  once  and 
a  half  the  length  of  the  til)i:e,  dark-brown  ;  the  first  joint  as  long 
as  the  four  following  taken  together,  upon  the  hind  side  with  three 
hardly  perceptible,  short  bristles.  Middle  tarsi  blackish-brown, 
only  brownish-yellow  at  the  basis,  distinctly  longer  than  the  til)iie; 
their  first  joint  over  1^  the  length  of  tlic  following  taken  together, 
which  are  of  a  decreasing  length.  Hind  tarsi  blackisii-brown, 
otherwise  as  in  the  male.     Wings  exactly  as  in  the  male. 

Hah.   Culia.      (Iliehl.) 

Obt^crralioi}  1.  Brazilian  specimens  of  P.  J unoidus  are  to  he 
found  in  Wintheni's  and  Wiedenmnirs  collections. 

Ohscrratinn  2.  I  hope  not  to  have  been  mistaken  in  the 
siiecitic  identity  of  both  sexes,  althougli  the  1)ristles  of  the  tibia"  in 
the  9  do  not  corres])()nd  exactly  to  those  in  the  (-f ,  as  is  usually 
the  ease.  The  great  resemblance  in  the  neuration  and  the  picture 
of  the  wings  seems  to  warrant  the  specific  identity.  Should  I  be 
mistaken  1  beg  to  take  the  J*  for  the  type  of  the  species. 

B.    Tr//(f/.s  ivithout  dnrk  picture. 

Ar   First  longiindinal  vein  cxii'nditig  fur  hei/ond  the.  middle  of  the  wing. 

8.  P.  ciliatlI8  LoKW.  %  . — Chalybpus,  nitidissimus,  alls  immaculatis, 
vciua  longituilinali  prima  eloiigata  et  costS,  pilis  .'irl)t'!->,i'iriia  ciliat^, 
peflibus  iiipris,  tarsorurn  ai)ticoruiii  articulo  pri'j:n  nigio  aauK^^t*,  articulo 
secundo  perbrevl. 


;?;■*. 


"•i.i;f'i 


PSILOPUS. 


2(;i 


Steel-blue,  very  sljinin?  ;  wines  witlimit  jiicture,  tliinl  l(iiigitiiiliii;il  vein 
elmigiitt'd,  uosta  ciliated  with  exticiiK-l y  dclii-ate,  minute  liaiis.  Ft-i-t 
black,  the  lli'st  joint  of  the  Ion;  tarsi  with  black  bristles;  the  second 
extremely  short.     Long.  eoip.  11.17.      Liiig.  al.  U.IS. 

Syn.  (?)    Psilopiis  tuuntliis  WiKi).,  Auss.  Zweill.  II,  227,  31). 
I'siliijjiis  (ilialu.^  Loiiw,  Neue  15eitr.  VUi,  fcb,  (J. 

Very  shining  .stt'cl-hluc,  the  uijpcr  jtart  of  tlio  f;ieo,  tho  middln 
of  tlic  front  and  tlie  liitcra!  nuiru'in  of  the  iilxlonicn  ^timmi,  tlin 
sitk's  of  the  front  and  tlio  niiddic  of  tho  al)(h)Mi('n  of  a  Itcautifid 
jturpii.sii  color.  Face  witliont  liairs,  oidy  tlic  lower  jiart  sdniewiiat 
dusted  with  white.  Talfti  ))lack  ;  j»rol)o,<cis  l)ro\vn.  Antenna! 
unusually  short;  their  seeoinl  joint  with  moderately  lon^  liristlcs; 
third  joint  snnill  ;  the  arista  not  vei'y  lonji',  snl)a|)ical.  IJi'istles 
u})on  tliorax  and  scntelluni  of  niediiiin  lenulh.  IMenra'  hiaek  with 
a  greenish  relleetion,  gray  on  aeeonnt  of  a  whitish  dust.  Al)do- 
nion  sliorter  and  brcjader  than  usual,  i)laek.  on  the  lateral  niai'gin 
and  on  llie  venter  for  the  most  jtart  whiti':h;  the  bristles  Itrfore 
the  ])ostcrior  nuirgin  lA'  the  single  segments  of  only  a  moderate 
length  ami  thickness.  The  small  hypiipyginm  black.  Co.xa;  and 
all  the  ff.'et  black  ;  fore  co.xie  with  a  white  i»ul)escence  and  with  a 
few  black  bristles.  Feim)ra  with  a  g'"een  redection,  n])on  the  under 
side  very  scarcely  fringed  with  long,  erect,  minute  hairs,  which 
have  near  the  tip  of  the  middle  ami  of  the  hind  femora  a  black, 
otherwise  a  whitish  color;  the  hind  side  of  the  fore  femora  has 
a  rather  distinct  l)lack  pubescence  towards  its  end.  Fore  tiliia; 
upon  the  outside  with  numerous  hair-like,  rather  long,  black  bris- 
tles. Middle  til)ia'  beset  with  a  moderate  number  of  proportion- 
ally rather  long  black  bristles.  Kind  til)i;e  upon  the  outside 
witli  a  row  of  about  six  black  bristles.  Fore  tarsi  but  little  longer 
than  the  tibiie  ;  their  first  joint  oidy  very  little  longer  than  the  four 
following  taken  together,  fringed  upon  its  outside  with  nmny  black 
bristles;  the  second  joint  e.\treim'ly  slw^rt,  hardly  as  hnig  as  the 
fifth  and  but  very  little  longer  than  half  the  third  ;  the  fourth 
joint  only  very  little  shorter  than  the  third.  Middle  tarsi  some- 
what longer  tliaii  the  tiliiie  ;  Hrst  joint  al)out  once  and  a  (piarter  the 
length  of  tlie  four  following  taken  together,  with  a  few  very  short, 
black  bristles;  the  second  to  the  fourth  joint  (»f  gradually  decreas- 
ing length;   lifth  joint  very  snmll.      Hind  tarsi  much  shorter  than 


the  tibiie,  the  lirst  joint  but  little  longer  than  the  four  follow! 


nng 


i) 


r 


f 


• 


3 

m 
I 


iii 


i: 


2152 


DII'TKIIA  OF  NOIITII  AMKKlCA. 


[I'ART  ir. 


taken  togcthor ;  the  second  to  the  fourth  joint  of  gradually  ih'- 
creasin-?  length,  tlie  lilth  joint  very  short.  JIaltcres  dingy  eiayish- 
yellow,  the  basis  of  the  jx-dunele  Idaek,  and  the  upper  side  of  the 
KMol)  brown,  'reguhe  witii  a  broad  black  margin  and  long  black 
cilia.  Wings  hyaline  with  black  veins  ;  an.xiliary  vein  unusually 
indistinct,  still  jtresent,  tirst  h)ngitudinal  vein  extending  far 
beyond  the  nuddle  of  the  anterior  margin  ;  the  nnirgin  has  a  fringe 
of  very  delicate,  erect,  curly,  minute  hairs,  from  the  humeral  trans- 
verse vein  to  the  tij)  of  the  lirst  longitudimd  vein,  which  are 
longest  between  those  two  points  where  the  margin  is  slightly 
sinuous  ;  the  anterior  branch  of  the  fourth  longitudinal  vein 
divei'ges  from  this  at  an  angle  which  is  almost  a  right  one,  and 
turns  afterwards,  more  in  a  curve  than  at  an  angle,  towards  the 
margin  of  the  wing,  which  it  reaches  before  the  iv\.K,  imnu;diately 
near  tlw;  tip  of  the  thiril  longitudinal  vein  ;  tlu;  jiostcrior  trans- 
verse vein  is  rather  obliiiue  and  only  very  little  sinuatcd. 

JI(il).    Florida.     (Osten-Sacken.) 

Ohf^crritlinn. — I  have  already  remarked  al»ove,  with  regard  to 
1\  inuiidiis  Wied.,  that  /'.  viliahm  dilfers  from  it  oidy  by  its 
larger  size,  its  more  steel-blue  than  purplish  coloring,  and,  as 
it  seems,  by  a  very  trilling  dilTereiice  in  the  bristles  (d  the  fore 
tibiiu  ;   it  is  therefore  very  likely  but  a  mere  variety  of  the  former. 

B.   First  longitudinal  xuiu  at  the  most  reachimj  to  the  middle  of  thi;  whig. 
1.  Arista  apparently  apical  and  strikingly  elongated. 

9,  P.  COSIiatlls  LoKw.  'J,  and  9- — Viridis,  ex  parte  chalylieus,  niti- 
dissiinus,  fas(;iis  alidominalilms  obseuris  nullis,  seta  anteiinaruin  sub- 
ai)icali  elongata,  jiedilms  longis,  gnic'ilil)us,  dilute  llavis,  coxis  feuiori- 
l)UH(ltie  nigiis,  setis  in  superiore  tibiaruni  anterioruni  latere  peiloiigis. 

^.  Setis  capitis,  thoiauis,  sfUtelli  abdoniinisijue  tenuibns,  loiiu'issiinis, 
appeiidicil)as  hypopygii  ]iallidis,  tarsorura  anticorum  artieulo  piimo 
tarsisiiue  iiiterinediis  supenie  eiliatis. 

f .  Setis  capitis,  thoracis,  scatelli  abdoniinis(jiie  teimibns,  niediocribns, 
tarsornm  anticorum  artieulo  priiuo  setalis  niinutis  subciliato,  tarsis 
interniediis  simplicibus. 

Green,  }>artl v  steel-blne,  xfry  shining,  without  dark  bands  on  the  abdomen  : 
wings  without  {lictiire  ;  the  elongated  arista  apjiarently  ai>ical ;  feet 
long,  slender,  pale-yellowisli,  cox.t  and  t'eiuora  black  ;  the  bristles  upon 
the  vii)per  side  of  the  four  anterior  tibiic  very  long. 

%  .  Bristles  upon  head,  thorax,  scutelluui,  and  abdomen  slender,  extremely 


PSILOPUS. 


2r)» 


long  ;  the  appt-ndages  of  tlit^  liyii(ii)vgiiuu  i)alo  ;  the  first  joint  of  the  fore 
and  niidille  tarsi  (.-iliated  upon  tlie  upper  side. 
9.  Uristlt's  uiiiin  liead,  thorax  and  uhdonieii,  slender,  of  medium  length; 
the  first  joint  of  tlie  fore  tarsi  indistinctly  ciliated  with  very  short 
minute  hristles,  middle  tarsi  plain.  Long.  corp.  0.18 — 0.113.  Long.  al. 
0.20—0.24. 

Sy.v.  Psilujnis  cdiiuitns  LoKW,  Neue  Beitr.  VIII,  80,  7. 

Male.     IJrijxlit  sliiiuiijr-}J:recn ;     tlionix    and  Kcutclluin  (in  the 
(loscrihcd    sitecinit'n)  iiiorc    stccl-bliio,   and    llio    head    liiindsume 


]»urpiisli 


■hluo 


J'iilpi   lilack  ;    jJi-oliosciH    brown.       Face;    williuut 


hairs,   liroach'P  than  usual;    its  small    under  side  is  dusted  with 
ji,'ruyisli-\viiite,  the  npix'r  part  more  convex  and,  iVom  a  side  view. 


more  projeetinji;  than  usual 


Tl 


le  second  joint  of   the  iintenntu 


with  a  small  number  of  rather  loiij^,  Init  not  very  stout  hristles  ; 
the  third  joint  ovate;  arista  ajtparently  ajjical,  but,  in  fact,  oidy 
sul)apical,  still  consideral)ly  shorter  than  the  b(t(Iy.  Kroni  with 
a  scattered,  very  delicate  white  ]>iiltescence  ;  the  black  l)ristles, 
inserted  upon  the  ocellar  tiil)ercle  and  in  the  immediate  proxi- 
mity of  the  ujiper  corner  t)f  the  eye  are  hair-like  and  of  a  (|iiite 
unusual  lenf!;th.  The  l)lack  bristles  upon  the  ni)per  side  of  the 
thorax  and  of  the  scutellum  are  of  the  same  hair-like  descripticjii ; 
also  those  inserted  before  the  incisures  of  the  alidoiiien,  the  latter 
are  oidy  of  a  still  more  strikinj;  lenji'ih  than  the  former.  T'lion 
the  upper  side  of  the  abdomen  there  seem  to  be,  besides  the  loiiif 


bristles  before   the   incisures,  onlv  sin 


>hort   hairs  of  a   lilack 


color;  u))on  the  iirst  scii'inent,  however,  as  aho  on  the  lateral 
niarfrin  and  on  the  venter,  there  is  a  very  lonir  whitish  ])nbescence; 
lonji-,  hair-like,  black  bristles  are  also  to  be  found  on  the  hind 
niarii'in  of  the  segments  of  the  venter,  similar  to  those  upon  the 
upper  side  of  the  alxlomen.  No  lilack  bands  are  jjcrceptible  at 
the  base  of  the  aliiloininal  segments.     The  hypojiyginm  is  jiartly 


destroyed  in  the  described  s))ecimen  ;  it  seems  that  it  was 
ish-l)lack,  and  that  it  had  liorii-shai)ed  yeli 


ow  aiiiieiulaL^cs. 


br 
( 


own- 
oxa» 


))lack,  the  foremost  with  a  long  white  pnl)esceiice  and  with  some 
black  l)ristles.  Femora  black,  with  a  green  reflection  ;  th»f  very 
extreme  tip  of  the  foremost  ones  yellow,  all  fringed  with  a  scattered 
erect   pnliescence  of 


a  white  color,  which   is  evervwln  re  of  a  con 


siileraole  length,  but  longest  uiion  the  under  -u\ 


Tilii, 


e  an 


d  t 


1  rsi 


very  slender,  yellowish  ;  the  usual  black  hairs  ratiier  scattered  and 
very   short.     The  fore  tiijiie   upon   the   Iirst  two-thirds  of  their 


2G4 


DII'TF.HA  OF  NOIlTir  AMKUICA. 


[I'AllT  II. 


\i\)\)ov  si(U',  fi'iiifrcd  with  a  row  of  liair-likc  Itristlcs,  which  ar(! 
ahcriiatc'Iy  of  I'ciiiai'kal)!^  h'iii;'th,  and  iIk'  hist  of  which  much  o;- 
(mhmIs  all  the  others  in  Icnjith.  Alitldlc  tiliiiu  with  a  moderate 
nuiiihur  of  hair-like  blaek  bristles,  which  are  als(j  (lihMii^iiishcil 
by  their  iiniisiial  leiiii-tli,  especially  those  upon  their  upper  side. 
Hind  tilda^  only  upon  the  upjier  side  with  short  bristles,  wliicli 
arc  but  little  distinji'iiished  from  the  usual  uunute  hairs. 
Fore  tarsi  at  least  twice  the  lentfth  of  the  tibia-,  very  slender; 
their  first  joint  somewhat  lonji'cr  tiiaii  the  four  fidlowiiiu-  taken 
tofjfcther,  upon  its  upper  side  willi  a  regular  row  of  pi'opor- 
tionally  very  lona'  hair-like  black  bristles;  the  followino- j(dnts  of 
rapidly  deereasiiifr  lenuMJi  ;  the  third,  at  the  upper  side  ofllie  tip, 
with  a  siiiji'le  bristle-like  bhudvhair;  the  lifth  joint  blackish-brown. 
3Iiddh(  tarsi  Vf'ry  slender,  al)out  once  and  a  third  the  lenjrlh  of  the 
tibiiu,  from  the  tip  of  the  third  joint  I)lackish-brown  ;  their  lirst 
joint  about  ov(!r  \^  the  leiifrth  of  the  four  followinii'  taken  to- 
frether,  the  leiitrth  of  which  is  ([uiekly  decreasinir ;  upon  its  upjier 
side  it  is  rej^ndarly  ciliated  with  bristle-like  liairs;  this  frinji-e  con- 
tinues over  the  upper  side  of  the  three  following"  joints,  Imt  there 
it  is  shorter,  more  delicate,  and  closer  ;  the  last  joint  is  not  ciliated, 
but  has  upon  its  up])er  side  a  sliort,  appressed,  snow-like  ])ubes- 
cence,  which  is  not  very  distinct.  Hind  tarsi  not  (piite  as  Ioul'' 
us  the  til)ia'  ;  their  first  joint  yellowish-brown,  distinctly  loiiji'cr 
than  the  followinji^  taken  toji'ether;  tliese  arc  blackish-bnjwn  and 
of  deereasiim:  lenji'th.  llalteres  yellowish  ;  tefi'uhc  with  a  bnjad 
blaek  margin  and  long  l)lack  cilia.  Wings  somewhat  narrow, 
hyaline,  with  blackish-l)rown  veins,  nt)t  ciliated  on  the  fore  mar- 
gin, the  first  longitudinal  vein  reaches  nearly  to  the  middle  of  the 
fore  margin  ;  the  anterior  brancli  of  the  fourth  longitudinal  vein 
diverges  at  a  rather  acute  angle  and  turns  towards  the  margin  at 
R  rounded  right  angle,  reaching  it  before  the  apex,  near  the  tip  of 
the  third  longitudinal  vein  ;  hind  trans\orso  vein  very  oblique, 
little  sinuated. 

Female.  It  resembles  the  male  very  much.  Face  somewhat 
broader.  Bristles  on  the  second  joint  of  the  antennas,  the  arista, 
the  bristles  upon  the  ocellar  tubercle,  at  the  ui)jier  corner  of  the  eye, 
upon  llie  upper  side  of  the  thorax,  and  u))oii  the  seutellum  shorter; 
the  l)ris(les  before  flic  IliclsiireH  (d"  the  alidomen  are  very  consider- 
ably shorter  ;  on  flie  veidcr,  ns  it  seeinH,  there  are  none  at  all. 
The  black  pubescence  upon  the  upper  side  of  the  abdomen  is  less 


T^ 


pcrlia 


2C5 

)S  soiiicwlint  niblx'tl 


psiLorus. 

pcnrro  than  in  llic  male,  if  it  Iins  not  Itccii 
nil'  ill  tlic  lattc'i";  (lie  wliitisii  idilK'scciict' of  tlii'  voiittT  iiiiicli  sliortrr. 
Frrt  of  tlie  same  coloring  as  in  the  male;  the  wliitisii  imljcsccnco 
of  till'  fciiioi'ii  is  nuicli  shorttT,  still  ii]»oii  tlit'ir  under  side  of 
t'onsicloniblo  loiifrtli  for  a  fcmalo;  upon  tlic  under  siile  of  the  fir(> 
fi'iiiora,  near  the  liasis,  t'lerc  are  also  some  stilf,  nearly  liristle-like 
whitish  hairs  of  a  reniarkahle  lenj^th.  I'lilx'seeiiee  and  bristles  of 
tlio  tiliiiu  f^eiierally  like  those  of  the  male,  still  all  bristles  are  not 
so  louf^,  and  ujioii  the  ui)[)er  side  of  tiie  fore  tibia",  the  alternating^ 
shorter  bristles  are  very  small.  Fore  tarsi  hardly  once  and  u  half 
the  leiifrth  of  the  tibiiu  ;  their  first  joint  much  loii;rer  than  the 
follo\vin;i:  taken  tofrether,  friiifred  upon  the  u[»p(r  side  with  a 
re</:iilar  row  of  short  black  bristles,  upon  the  underside  with  only  a 
few  still  sliorter  black  bristles  ;  the  followiiiff  Joints  of  decreasinj^ 
lenjjfth,  from  the  second  to  the  fourth  brown,  the  liftli  Ijlack.  Middle 
tarsi  distinctly  loiiffcr  tlian  the  tibiie,  not  ciliated  upon  the  upper 
side  ;  the  lirst  joint  distinctly  I(uiffer  than  the  four  followinjj^  taken 
together;  the  latter  l)lack-brown  and  of  (h'creasing  Icngfli,  Hind 
tarsi  brownish-lilack,  much  shorter  than  tli<'  tilna",  the  first  joint 
hardly  somewhat  longer  tluin  the  following  taken  together. 
Wings  as  in  the  male,  only  somewhat  shorter,  also  proportionally 
less  narrow. 

Hub.  Middle  States.     (Osten-Raeken.) 

Observation. — Whetlier  the  distinctly  darker  color  of  the  tarsi 
of  the  9  is  only  an  accidental,  individual  deviation  or  Jiot,  cannot 
be  judged  from  a  single  specimen  of  each  sex. 

2.  Arista  distinctly  dorsal  and  not  particularly  elongated. 

a.  Fore  tibiae  only  iu  the  %  ,  fore  and  middle  tibi.c  in  the  9  >  yellow. 

10.  P.  clirysoprasilis  Walk.      %    and    9- — Viridis,  vel  ex   viridi 

chalyheus,  nitidus,  alis  iiniaaculatis,  facie  nuda. 
%.  Abdoinine  fasciis  latiusculis  nigris  ornato,  halterum  nigrorum  capitulo 
fusco,    peilibus    nigris,   tibiis    auticis    tlavis,    tarsorum    internu-dioruiu 
articulo  prime  superne  pilis  eroctis  rigidis  ciliato. 
9  .  Abdominis  fasciis  nigris,  angustissimis,  halteribus  flavis,  pedibus  nigris, 
tibiis  anterioribus  flavis. 

Green  or  greenish  blue,  shining ;  wings  without  picture,  face  without 
hairs. 

%  Abdomen  with  rather  broad  black  bands  ;  knob  of  the  black  halteres 
brown;  feet  black,  the  fore  tibiiB  yellow,  the  flr.^t  joint  of  the  middle 
tarsi  upon  the  upper  side  ciliated  with  upright  stiff  liairs. 


i 


W] 


■  HI 


'  f 


:  J 

'  Mit: 


UJt:i 


■J 

Hi 


2r>o 


DIl'TKUA  OF  NdllTH  AMF.IIICA. 


[I'MIT  n. 


9  .  AIpilfHiieii  with  cxtrciiu'ly  imridw  li.iiids  ;  lialteies  yellow  ;  ft-ct  lilaik, 
foiv  .iiiil  uiiddlo  tibifo  yellow.  Long,  wiy,  u.l'J — U.23,  Loug.  ul.  0.18 
— (».:!(•. 

SvN.   PsilD/iiis  rhrysoiiriisl  Walkkk,  List,  etc.  Ill,  il46. 

J'siliiims  chri/suiirasius    LtiKw,  Neue  beitr.    VIII,  90,  8. 

.}f(ili\  Very  sliiiiiiifr,  frrccii,  tlio  liciul,  tlio  liiiid  psirt  of  tlio 
lliorax,  llie  .scutclliiiii,  and  tin-  mitcrior  st'};ini'iits  (if  llu;  hIkIoiir'ii 
iiinro  stocl-ltliic,  tlio  last  scjiiiiciits  of  tliu  uImIoiikmi  soiiictiiiics 
froldcii-iiTct'ii.  I'alpi  black  ;  proboscis  brown.  Face  witlioul 
liairs,  tliinly  (lasted  with  white;  its  upjicr  jiurt  rather  convex. 
'J'lic  bristles  on  the  second  joint  of  the  antenna;  rather  lon<jr ;  the 
nrista  dorsal  and  of  ordinary  length.  Front  with  a  lonjj  whitish 
ltnl)escence  and  the  usual  black  bristles  upon  the  thorax  and  the 
scntelluni  of  a  rather  considerable  lenjrth.  The  black  bands  of 
the  abdomen  are  narrow  upon  the  anterior  scfrnients  and  of  con- 
siderable breadth  upon  the  posterior  ones.  The  black  pubescence 
of  the  altdonieii  is  rather  short  ;  upon  its  first  sejriuents,  as  also 
ui)on  the  anterior  part  of  the  lateral  niar<>in  and  the  venter  there 
is  a  delicate  white  pubescence,  while  the  hind  part  of  the  venter 
lias  a  black  jtubescence  of  considerable  Icnj^th.  The  black  bris- 
tles l)efore  the  incisures  of  the  abdomen  are  numerous,  but  ratlier 
short.  The  small  hyi)opyjj:ium  black,  its  lamelhe  dark-l)rown. 
Coxie  black,  the  foremost  with  a  considerable  white  ))ul)esceii(.(j 
and  a  few  black  bristles.  Femora  black  with  a  prroeiiish  reflection, 
upon  the  under  side  with  a  lonj,',  upri<>'ht,  whitish  ])nbescence. 
F<»re  tibia'  brownish-yellow,  frin<>-ed  with  oidy  a  moderate  number 
of  short  black  bristles.  ^Middle  tibiiu  brownisli-black,  sometimes 
nearly  black,  beset  upon  the  front  side  with  a  rcfrular  row  of  black 
bristles,  otherwise  only  with  a  small  nundier  of  them  ;  upon  the 
ii])per  side  with  rather  bristle-like  black  liairs.  Hind  tibia;  black 
with  coarse  black  hairs,  upon  the  outside  fringed  with  a  regular 
longitudinal  row  of  black,  only  moderately  long,  bristles.  Fore 
tarsi  rather  slender,  about  once  and  a  third  the  length  of  the 
til)ia' ;  the  first  joint  brownish-yellow,  much  longer  than  the 
fullowing  taken  together,  ujion  the  hind  side  with  three  or  four 
sliiut  black  bristles;  the  following  joints  blackish-brown,  from 
the  sccoikI  to  the  fourth  of  rapidly  decreasing  length,  the  fifth  as 
long  as  the  fnurth.  Middle  tarsi  about  once  and  a  half  the  length 
of  tho  tibia) ;  the  first  joint  black-brown,  nearly  twice  the  length 


AH 


(llO 
U'll 

ics 
'III 

'.V. 

le 


rtiii,(»i'i  a 


JOT 


of  tlif  fdllowiiifr  1  ilicii  tt)ii'<'tli('r,  upon  its  upper  <'uh  with  a 
I'l  jrular  IViii;;!'  nf  stilV,  pcrpciKliculiU'ly  civel,  luistlc-Iikc,  minute 
liairs,  npiiii  tlio  uikIci'  sidf  willi  ul)out  Hcvcd  niinutf  Idiick 
bristles;  tiie  joints  of  tlie  tiic.-i  fniin  tiic  seeoinl  to  the  ruiii'tii  very 
rupidly  (h-crcast!  in  leiitrth.  so  tiiat  llie  second  is  still  Miincwhal 
loii^rer  than  tlu;  third  and  fourth  taken  toffelher  ;  tliu  lifth  joint 
not  shorter  tlian  liie  Iniirtli  ;  the  eiiiiitiou  of  tlio  lirst  inint  ul'  the 
t  irsi  continues  also  over  tlw;  up]ter  side  of  the  xcoiid  and 
third  joints,  hut  C(uisists  there  of  litlh  miirs  of  frradually  diniin- 
i.>hinj;  len^ytli,  so  tiiat  linally  it  heconies  alnin-i  inipci'eeptihio. 
Hind  tarsi  black,  pereeplihiy  shorter  than  the  iii)ia!  ;  (heir  lirst 
joint  soinewhiit  htn<;'er  than  the  followin^r  taken  tuirciher,  tlu; 
ieiijXth  of  which  is  fi'radiially  decreasing'.  Ilalteres  lil;ii-kisii,  the 
kiiol)  brown  or  dingv  brownish-yellow;  the  teji'idie  witii  a  liroud 
blii'k  border  and  loiiii'  lilaek  cilia.  Winj,rs  hyaline  with  black 
veins;  tiie  lirst  longitudinal  vein  reaches  nearly  to  the  middle  of 
tin;  winj;  ;  the  anterior  branch  of  the  fourth  lonuiiudimd  vein 
diverj^es  from  it  under  a  nearly  vi;i'ht  aiiffle,  aixl  turns  afterwards 
in  a  curve  towards  the  niarji'in,  which  it  reaches  rather  hir  from 
11'  '  apex,  immediately  near  the  tij>  of  the  third  loiifritiidinal  vein  ; 
hind  transverse  vein  rather  obli(|iie.  hardly  somewhaL  sinuatcd  ; 
the  si)iice  between  the  nuirjrin  of  the  wiiij:^  and  the  third  lon^itu- 


diii 


al  vein, 


bey(iiid  thi;  tip  nf  the  lirst  loiif^itudinal  vein,  is  S'juie- 


what  more  frrayish  than  the  reiiiainiiiir  surface  of  the  winj."" 


^\'mah 


erv 


like    the 


<i- 


The    face    but    little    broader. 


The  arista,  the  bristles  of  the  second  joint  of  the  antcnme,  those 
upon  front,  thorax  and  seutellum,  as  also  l)eforo  the  incisures  of  the 
abdomen,  are  much  shorter.  The  white  pui)esceiice  on  the  under 
side  of  the  femora  also  shorter,  still  (tf  a  considerable  length  for  a 
9.  Fore  til}iie  as  in  the  (^,  still  the  bristles  shorter.  Middh; 
tibiiC  browiush-yellow,  with  scattered  black  bristles  of  mediuiii 
length.  Fore  tarsi  but  little  shorter  than  in  the  (-f,  however  of 
the  same  struetun;  and  coloring.  Middle  tarsi  plain,  brownish- 
black,  not  quite  once  and  a  half  the  length  of  the  tibia* ;  their  lirsL 
joint  not  ciliated.  Ilalteres  light-yellowish  with  blackish  peduncle. 
Wings  as  in  the  (^ ,  still  without  the  gray  shade,  which  is  to  bu 
found  in  the  latter  beyoud  the  tip  of  the  lirst  longitudinal  vein. 
Uah.   Cuba.     (Puey.) 


s 


■ '  iff 


■  •'!:■ 


i 

',  ";•' ' 

j 

1! 

•  t 

v^ 

^> 


IMAGE  EVALUATION 
TEST  TARGET  (MT-S) 


1.0 


ri8 


1 2.5 


Hi    ».     i 


2.2 


I.I 


11.25 


1.8 


1.6 


||i4 


-    6" 


<? 


,V4^ 


z 


<. 


V] 


/Om 

*V^ 


/: 


/A 


'W 


0 


/ 


Phctographic 

Sciences 

(Corporation 


33  WEST  MAIN  STREET 

WEBSTER,  N.Y.  14580 

(716)  B72-4S03 


^4* 


208 


DIl'TEUA  OF  NOnTII  AMERICA. 


[part  II. 


y 


!l 


b.  In  the  iinle    all  the  tibiu?,  in  the  feiuulu  alKo  all  femora  ^^ellovr. 

11.  I*.  sc'Obiliator  Iaikw.  %  and  9. — Parvus,  nitiilissiiiiu.s,  viridig 
vi'l  ex  viriili  chalvlH-us,  facie  pilo;-.;!,,  aliii)  iuiiiiaeulatis,  anteiioro  ven;o 
l()ii|.'itu<linalis  4uartif  raiiiulo  aicuatiiii  ducto,  haltt-rihiis  tiavis. 

1j  .  .Al.doiiiiiie  lil^ciis  nigris  an^u.»ti.-s  ornalo  et  in  a|(ic'H  |iilis  .solito  jiaulo 
Idngicinliiis  vi'stito,  ffnnirilius  nigris,  viridiuiicantihus,  siininio  ffniorum 
ant^rioruin  aj)ict!  tiliiisiine  oninihuH  llavis,  tibiaruni  ixtsticaruin  apiie 
tart<iM(|nH  nninllnis  e.\  fusio  iiijiris,  i)rinio  tanien  tarsdruin  anticoruui 
artitul"  llavo,  calrare  tihiaruui  inttfruiediaruni  longissiuio,  priuut  tarso- 
runi  inturnit'ilioruni  articulo  setulis  inciuvis  sualiro. 

9.  Fasuiis  al>d(iniinalilins  niu'ris  nnllis,  <.-nxis  anticis,  feinorilms  tiliii.«iiue 
onniihus  tiavis,  e.vtremo  tihiarnni  postioaruin  apice  tarsis<jue  uniniliun 
ex  fiisco  nigris,  has!  tanien  tarsoruni  antcriornni  tlavH. 

Small,  Very  shining,  green  or  greenish-lilne  ;  face  liairy  ;  wings  without 
jiicture,  the  anterior  branch  »  r  the  fourth  longitudinal  vein  arch-like  ; 
halteres  yellow. 

%  .  Abdomen  with  narrow  black  )ands,  at  the  tip  with  a  soniewl  at  sliorter 
pubescence  than  usual ;  fcjnora  black,  with  a  green  lustre,  the  extreme 
tip  of  the  four  a.iterior  femora  and  ;<11  tibiae  yellow,  the  tip  of  the  hinil 
tibi:e  and  all  tarsi  brownish-black,  still  the  first  joint  of  the  fore  tar>i 
yellow,  the  spur  of  the  midille  tiliifc  extremely  long  ;  tlie  first  joint  of 
the  mi<lille  tarsi  rasp-like.  Wing  iieset  with  crooked  bristles. 

9.  Abilomen  without  black  hands;  fore  coxie.  all  femora  and  all  tibiae 
yellow  ;  the  extreme  tip  of  the  hind  tibia;  and  all  tarsi  brownish-bl;ick> 
still  the  basis  of  the  fore  and  middle  tarsi  yellow.  Long.  corp.  0.15 — 
U.IG.     Long.  al.  0.15.— 0.16. 

Syn.   PsilnpHS  scobinator  LoKW,  Neue  Beitr.  VIII,  91,  9. 

Male.  Ilaiulsonie  shining,  frrecn,  sometimes  pnrtly  stcel-bluc. 
I'iilpi  hhick  ;  i»r(»l)osois  browiiish-yellow.  Faoe  with  a  loiif^  whitish 
j>iil»fS('i'iiee  and  not  very  ch)sely  dusted  with  white.  The  second 
joint  of  the  antennie  witli  moderately  \o\\^  bristles;  the  arista 
itself  only  of  the  usual  length.  The  delicate  scattered  pul)escence 
of  the  fr((nt  generally  yellowish,  more  seldom  whitish;  the  usual 
black  bristles  upon  the  ocellar  tubercle  and  in  the  upper  eye- 
corner  rather  long.  The  bristles  upon  thora.x  and  scutellum  are 
also  rather  long.  The  hind  part  of  the  abdomen  is  more  ))ointed 
in  the  shape  of  a  cone  than  in  most  of  the  other  species  ;  the  black 
bands  at  ♦he  basis  of  tlie  segments  of  the  abdomen  are  narrow, 
broader  only  upon  the  segments.  The  short  |»ubescence  of  tho 
abdomen  is  black;  upon  the  first  segment,  as  alsl)  on  the  anterior 
part  of  the  lateral  margin  and  on  the  greater  part  of  the  venter  it  is 


i^'. 


V. 


rsiLorirs. 


2<;9 


wliitish;  the  1)lack  hristk's  l)ofurc  tlie  iiicisurps  niT  not  rriiiiP'kalily 
lt)ii]Lr ;  the  l)ri.stle-like  hairs  ul  tiie  cxtrt'im'  tip  of  tin-  alKloiiuii  ave 
mtlior  loii^.  The  small  liy[)o|»\ jrium  is  hiack,  wiili  extrcinciy 
small  lihick  ni>iK'ii(la}r("<.  Coxa-  Ithick,  dustfd  with  white,  the  ibre- 
niost  with  a  white  pulK'sceiiee  and  a  (t'W  i)liick  bristles.  FeiiKini 
Itlaek  with  a  preen  relleetioii ;  the  anterior  ones  lijiht  yellow  at  the 
extreme  tip;  upon  the  under  side  of  all  there  is  a  delicate,  ereet, 
rather  sparse  |)ul»eseenee  of  niediuju  length.  'I'iltiie  yllow  ;  the 
hindmost  colored  with  hlackish-hrown  to  a  rather  consideralile 
extent  at  the  tip.  Fore  tihite  upon  the  upper  side  with  al)out  four 
short  hhick,  minute  bristles,  upon  the  iiind  side  with  about  six  still 
shorter  ones.  Middle  tibiie  upon  the  first  half  of  the  hind  side 
with  three  not  very  lonjr  black  bristles;  a  perceptibly  longer  biis- 
tle  is  to  be  found  upon  the  first  (piarter  of  the  front  side,  another 
near  its  end  ;  innncdiately  before  the  end  on  the  under  side  an 
unusually  long,  straight,  «liverging,  black  bristle  assumes  the  shajte 
of  a  rather  striking  s))ur  of  the  tibia.  On  the  hind  tibiie,  besides 
the  black  bristles  inserted  at  the  tip,  there  is  but  one  bristle  de- 
serving to  be  noticed,  upon  the  first  third  of  the  outside.  Fore 
tarsi  slender,  somewhat  longer  than  the  tibia^;  their  lirst  joint 
yellow,  only  at  the  extreme  tii>  brownish-black,  nearly  once  and  a 
half  the  length  of  the  following  taken  together ;  the  latter  are 
brownish-black;  from  the  second  to  the  fourth  of  rapidly  decreasiiig 
length,  the  fifth  as  long  as  the  fourth.  There  are  no  bristles  nor 
any  unusual  i)ul)escence  on  the  fore  tarsi.  Middle  tarsi  brcwnish- 
J>lack,  considerably  shorter  than  the  tiJtia^;  their  first  joint  nbout 
once  and  a  (piarter  the  length  of  the  following  taken  together.  Its 
whole  length  upon  the  under  side  fringed  ras])-like  with  short  idack 
bristles,  crooked  downwards,  and  inserted  in  a  rov.-  on  both  sides; 
the  four  following  joints  of  decreasing  length.  Hind  tarsi  lilack, 
hardly  two  thirds  of  the  length  of  the  tibia>;  their  first  joint  little 
longer  than  the  following  taken  together;  the  second  to  fourth 
joint  of  rapidly  decreasing  length  ;  the  two  last  joints  of  an  e(pial 
length,  somewhat  flattened.  TIalteres  yellowish  with  blackish 
])edunele  ;  tcguhr  with  l»lack  cilia.  Wings  hya'ine  with  bla'-k 
veins  ;  the  end  of  the  first  longitudinal  vein  is  a  c((nsideral)le  dis- 
tance before  the  middle  of  the  wing  .  the  anterior  branch  of  the 
fourth  longitudinal  vein  diverges  from  it  at  an  angle  which  is  vr-ry 
nearly  a  right  oiie,  and  turns  then  arch-like  towards  the  margin, 
which  it  reaches  rather  far  before  the  apex,  (piite  near  the  tip  of 


W. 


^il 


^: 

^j 

-. 

'  !', 


i 


Ml'TKUA  OK  NdUTII  AMKIUCA. 


[PAir; 


the  third  lonyitiidiiial  vein  ;  liiixl  truiifversc  VL-iii  iiiidcriitcly  nli- 
litiitf  ami  iii'iiri}'  slniiglil. 

I-'rmalr.  Kacu  soiaewliat  broader  tliaii  in  tlie  J*.  All  liristii  s 
|K'rct'i>iil)ly  sliurkr.  Abdoiiiuii,  in  the  usual  posiUDii  of  iliu  r-f^-- 
uieiits,  wiihuMl  IjlacU  hands.  Fore  e<ixu;  yellow,  at  the  exinine 
liasis    ol'teu   eol')red    with    gray  ;    their    while    i>ul)esceiiee    uiucii 


■>U>) 


rter  and    the   hhu-k   bristle: 


more 


sirik 


in< 


the  I 


enima 


aliogeiher  yellow,  I'ring'ed  upon  the  under  ssitle  with  but  very  siiuri, 
ereel,  whitish  hairs.  Til)iiu  (juile  yellow,  the  lundniost  somewhat 
inliiseated  only  at  the  extreme  tip.  'I'he  l)rislies  of  tiie  tibise  are 
(jiiile  like  those  of  the  ^,  still  .some  of  the  bristles  are  missing,  nr 
at  least  shorter.  Tarsi  plain,  somewhat  shorter  than  in  the  ^  ; 
the  lirst  joint  of  the  middle  tarsi  bntwnish-yellow,  up(»n  tiie  mukv 
side  with  but  a  few  very  short  blaek  l)ristles. 

JIah.   yii'W  York,  Illinois.      (OslenSacken.) 

Olfin'rration  1. — With  J',  xcuhinatnr  Itegins  a  series  of  vcrv 
closely  resembling  species,  which  agree  in  a  remarkalde  nunint  r 
not  only  in  size  antl  coloring,  but  also  in  the  nmjorily  of  the 
jdastic  characters.  The  structure  of' the  middle  feet  in  the  J* 
shows  dilVerences,  which   leave  no  doul)t  as  to  their  specilic  d 


!.■>- 


tincUies.s.  I  he  distnietion  of  their  icmales  (jjiers  such  diirKiil- 
ties,  that  I  am  unal>le  to  overcome  them  with  the  materials  at  my 
commantl.  I  have  received  1'.  xi-olniKitur  in  so  large  nunilu  rs, 
that  the  9  belonging  to  this  species  is  surely  al)undantly  ri'pre- 
sented  among  them  ;  but  whether  I  have  not  confounded  with  it 
feuniies  of  the  three  following  species,  I  am  not  al»le  to  nil. 
Some  of  the  females,  I  suspect,  belong  to  1'.  i-aiidd/iihix,  i>tliers 
niav  be  I',  incniiii:,  but  I  am  not  nositivi'lv  certain  al»out  anv  mm 
of  them.  Positive  characters  for  the  distinction  of  the  females 
of  these  species  ca'.i  only  be  accjuired  by  the  observation  of  tlio 
s]»ecies  in  life. 


Ol).<rrr'i/ion  2. — There   is    no  doul)t    that  7*.   femoral 


iiti 


belongs  to  the  present  group.  Whether  it  is  one  of  the  species 
known  to  me,  and  which  of  them,  1  cannot  decide,  as  Say  docs 
not  mention  any  of  those  plastic  characters  by  which  alone  they 
can  be  distinguished,  and  as  the  J*  specimen  sent  by  Say  to 
Wiedeman  has  not  been  preserved  in  the  collection  of  the  latter. 


PSII.OITS. 


•>  I  1 


13.  P.  caildatlllllH  Lukw.  \,. — r.-iivus,  iiiticliHsimas,  viri.lis  vd 
ex  viritli  cli.'ilybfus,  facie  pilosii,  aliH  iinniacultitix,  aiiteriore  Vfiiii'  loiigi- 
tniliiialis  ijiiartip  rainiilo  arcuatiiu  <lu<:to,  liulterilxis  tlavi.t, 

%.  AMoui'MW.  fasciis  iiigris  angustis  oriiato  ft  in  apice  jiilis  solito  iiiuI'k 
loiigioiilms  veHtito,  feiiioiiburt  iiii^ris,  virjiliiiiicaiitihiis,  sumiiii>  f.-iiHiriiiu 
anterioruiii  a|>ifo  tiliiis<iiiti  niiiiiilnis  llavis,  apice  tihiarniit  iKi>tii'ai-ii!ii 
tarsis(jiie  oiiiiiilnis  t'x  ftisco  iiiirri.i,  tais(!rinii  aiitfriorum  basi  taintii 
llava.  calcare  tihiarutn  iiiterinediarnm  Idinisniino,  priuio  tarsoiuiu  iiiter- 
lueiiiurum  articulu  sutulia  inuurvia  licat  :u. 

9 

Suiall,  vtry  sliininfr,  gn'en  or  bluish-Kreen  ;  face  liairy ;  wines  uitlidiit 
picture;  the  aiiteri'ir  brancli  of  tlie  fourtli  loiigitiulinul  vein  ai'cii*<(l  ; 
lialtere.s  yelbiw. 

%.  Abiiiinien  with  narrciw  black  bands,  at  tlie  tip  with  much  loncer  liairs 
than  usual,  femora  black,  witli  a  greenish  retlet^tion,  the  extreme  tip  of  the 
four  anterior  femora,  and  all  tibije  yellow  ;  the  tipof  the  hind  tibi.-e,  and 
all  tarsi  brownish-black  ;  still  the  lirsf  joint  of  the  fore  tarsi  yt-lluw,  the 
spur  of  the  middle  tibias  very  long  ;  first  joint  of  the  miildle  tar^i 
beset  witli  crooked  bristles,  rasp-like. 

9 Long.  corp.  0.15.     Long.  al.  0.15. 

/5y.v.   I'sihipus  cinutatulua  LoKW,  Neue  Beitr.  VIII,  \Ki,  12. 

It  rosi'iiilil'S  the  7*.  sfohinafor  so  much,  that  the  statement  of 
he  slijrlit  diirereiioes  will  lie  perfectly  suHicleiit  for  its  rccou'iiition  ; 
the  liairs  at  the  tip  of  the  alKlomeii  are  much  lon<rer,  umre  liristle- 
like,  and  when  well  preserved,  are  of  the  same  length  as  the  four 
hist  sefrnients  of  the  al)domen,  whilst  iu  P.  si-fihhi(iti>r,  the  two 
which  are  longest  among  them  are  Itut  little  longer  than  the  la^t 
segment. 

Ifah.  Missouri.  (Schaum.)  Illinois.  (Le  IJaron.) 
Ohxi'rrnlion. — The  name  w'iiirh  I  have  given  to  this  s])ccies  is 
intended  to  retnind  of  P.  cniKlntiiH  Wied.,  which  uinlonljtedlr 
belongs  to  the  saiiK.'  grouj) ;  but.  1)\'  its  larger  size,  it  seems  to 
be  dilferent  from  the  species  known  to  me.  In  the  AV'/r  /iri/riii/r, 
in  consecpience  of  a  mistake,  some  incorrect  statements  have 
been  made  by  me  al)out  I\  cniiihitulim.  Its  rcseiiildance  with 
P.  scobinnlor  is  so  great  that  one  would  be  very  much  inclined  to 
take  it  for  a  mere  variety  of  it.  if  the  ditVcreiicc  in  the  length  nf 
the  hairs  at  the  tip  of  the  abdomen  was  not  so  coiisideralile,  ami 
if  the  distinction  of  the  other  sjtecies  of  this  group,  otherwi>e 
agreeing  perfectly  in  all  characters,  did  not  likewise  rest  on  some 
single  plastic  character. 


w 

m 


.■•" 


# 


'■  I 


»; 

*  ■\'  i 

:  '.  ■    * 

\  ■•'■ 

m 


O-'l 


Dll'TEIlA  OF  N(tKTIC  AMIHUCA. 


ri'AUT  II 


}     li 


M.     i 


I, 


13.  I*,  en  lea  rat  II H  Loi:w.  %. — Parvus,  nitidisHiimis,  viiiilU  vd  vx 
viridi  cliiil^'licus,  fauie  pilosA,,  nli.s  iiiiiiiaoiilatiH,  anlfrioru  vuiiiu  ioiigitu- 
(liiialis  (jtiartie  ruiiiulo  an^uatiiii  duulo,  huittiiibu!)  tlavia. 

^.  Aliiloiiiii^u  fanciiM  iii^riH  aiigiistis  oriiato,  ffiiioriliua  iiigri.s,  viridi- 
iiii(-aiit'i)U.s,  suinmo  feiiioruiu  antfiiorum  apicH  til)iis(|iiu  oiiiiiiliiis  tint  is, 
tiliiarum  postiitaruni  apice  taisis.juu  oinnilius  ex  fu.sco  iiigris,  priiiio 
taiiitM)  tarsorum  aiiticoruiii  artii'iilo  llavu,  calcaru  tiliiarum  iiitfinii^dia- 
ruui  loiigi.ssiuio,  piimo  tarsioruni  iuturiuediorum  artiuulo  8iui]>liui. 

9 

f^iiiall,  very  sliiuiiii;,  grt'cn  or  grt'enish-blne  ;  faow  hairy;  wings  witliout 
liii'tui't^  tliu  aiiturior  braiiuh  of  tliu  fourtli  luiigitudinal  veiu  arched; 
ha'. teres  ytillow, 

%.  Alidonieu  with  narrow  hlaek  hamls  ;  femora  Mack,  with  a  greenish 
lustre,  the  extreme  tip  of  tlie  four  anterior  femora  and  all  til)iie  yellow  ; 
the  tip  of  the  hind  tilii.-e  and  all  tarsi  hrownisii-hlaek  ;  still  the  first 
joint  of  the  fore  tarsi  yellow  ;  tlie  spur  of  tiie  middle  tibije  extremely 
long  ;  the  lirst  joint  of  the  middle  tarsi  plain. 

5 Long.  Corp.  M.l.'i.     Long.  al.  O.l.'i. 

yv.v.   rsil(>iiHs  ciilraratiis  LoEW,  Neue  Beitr.  VIII,  93,  10. 

I  am  unabhj  to  luontion  any  (linVrcMK'O  from  the  male  of  the 
P.  Kctihitwior,  except  that  the  middle  tarsi  are  somewhat  longer, 
namely,  as  lou};;  as  the  til)ia!,  and  that  their  first  joint  ui>(»n  the 
under  side  is  not  frinjred  rasp-like,  with  numerous,  crooked  bristles, 
but  has  oidy  a  few  scattered  siraijrht  bristles. 

JIab.  Carolina.     (Zimmenuaini.) 

14.  P.  inerniis  Lokw.  %  . — Parvus,  nitidissimus,  viridis  vel  ex  viridi 
chalyheus,  facie  pilos^,  alis  immaculatis,  anteriore  veujp  longitudinalia 
cjuart.TB  ramulo  arcuatim  ducto,  halterihus  llavia. 

^  .  Abdomine  fasciis  nigris  anjiustis  ornate  et  in  apice  pilia  solito  longiori- 
bus  nuUis  vestito,  femoribua  nigris,  viridi-micantibus,  summo  femorum 
anteriorum  apice  tiliiis<ine  omnibus  flavis,  apice  tibiarum  posticarum 
extremo  tarsisque  onniibus  ex  fusco  nigris,  tarsornin  anteriorum  basi 
tamen  flavil,  calcare  tibiarum  intermediarum  breviasimo,  primo  tarsorum 
interniediorum  articulo  simplici. 

9 

Small,  very  shining,  green  or  bluish-greeii,  face  hairy  ;  wings  withont 
pictur>3,  the  anterior  branch  of  the  fourth  longitudinal  vein  arched  : 
halteres  yellow. 

^ .  AVxlomen  with  narrow  black  bands,  at  the  tip  withont  liairs  longer 
than  usual ;  femora  black,  with  greenish  lustre,  the  extreme  tip  of  the 
four  anterior  femora  and  all  tibire  yellow,  the  extreme  tip  of  the  hind 
tibiae  and  all  tarsi  brownish-black,  still  the  basis  of  the  fore  and  middle 


rsii.oiM's. 


tarsi  yellow  ;  tlu-  spur  of  the  uiidille  tihi.f  very  .short  ;  tho  llr.st  joint  of 
tint  luiiiillH  tursi  ]ilain. 
9 Loiii?.  Corp.  0.1  f).     Long.  al.  0.15. 

Sy.v.   ]\siloj)its  liurmls  Lokw,  Neuo  Ueitr.  VIII,  'J3,  11. 

TIlis  Specie  i  is  lii<e\visc  most  elusely  allied  to  the  ^^  of  /'. 
8cr,hiiui(ur.  Ill  tlu'  eoioriii};  there  are  no  <lill'erenees,  exeept  liiat 
ill  7'.  iiwrmiti  tlie  iiiiul  tiliiie  are  somewhat  inruscatetl  at  the  very 
extreme  tip,  while  in  the  ^^  of  Hcobinatur  tlie  l)laekisii-lirowii 
coloriiijr  is  e.xteiide*!  nearly  over  tiie  whole  of  their  last  (piarter, 
and  tiiat  in  inermii^  the  first  joint  of  tlie  middle  larsi  is  hrownish- 
vellow  nearly  to  the  miildle.  AVhelher  these  ditVereiiees  in  the 
tolorini?  are  eoiistant,  further  observations  must  show.  The  plas- 
tic dill'erences,  which  secure  the  specific  distinctness  of  incnuin 
from  the  two  ]>revious  species  lies  in  the  strnclnre  of  the  middio 
feet.  Whilst  in  the  latter  that  lirisile,  which  is  inserted  near  the 
tij)  of  the  tibiiu  upon  the  inner  side,  forms  an  nnnsnally  lon<r, 
<livei'giiijr  spur,  and  much  exceeds  in  len<rth  the  hristle  inserted 
on  the  front  side  of  the  tip,  in  J*,  inrrwiii  the  hristlt;  inserted  on 
the  inner  side  is  not  only  the  much  smaller  one,  Init  is  also  not 
diverjriiif^  ;  the  reinainiiijr  bristles  of  the  middle  tibise  are  onsider- 
al)ly  loiif^er  than  in  scobinalor  nud  calrarulua ;  the  lirst  joint  of 
the  middle  tarsi  is  ]>lain,  as  in  va learnt ui^,  but  lias  upon  its  under 
side  a  still  smaller  number  of  very  short,  straight  bristles  ;  the  foro 
and  middle  tarsi  are  somewhat  lonp:er  than  in  the  two  previous 
species,  still  tliis  dilferencc  is  but  trilling'. 

Hub.   Pennsylvania.     (Osten-Sackeii.) 


M-f'-' 


m 


-''3- 


Ht 


II.  Tegul.t;  -vvitii  pale  ciua. 
A.  Aitlcnnoe  entirely  blaik. 

15.  P.  scintillaiiH  Lokw.  %  and  9 . — Totu.s  nitidissimus,  virldis 
vel  ex  viridi  chalyheus,  alidotuiiir  interdum  ex  aurt'o  viridi,  anteunis 
nigris,  coxis  anticis  jiedihusiiue  llavis. 

%.  Alarum  costa  breviter  ciliata,  hypopygii  appendicibus  atris. 

(■  Alarum  costa  noii  ciliatd. 

Very  shining,  green  or  bluish-green,  abdomen  sometimes  golden-greeu; 

antenme  black  ;  fore  ooxa?  and  all  the  fe"t  yellow. 
%  .  Costa  with  short  cilia  ;  appeinlages  of  the  hypopygiuiu  black. 
9.  Costa  not  ciliated.     Long.  corp.  0.14— o.ltj.     Long.  al.  O.l'i — 0.17. 

Sy.\.  Psilopus  scintillans  Loew,  Neue  Beitr.  VIII,  94,  115. 
18 


. 

! 

:■[ 

1:1 

274 


Dtl'TKKA  OF  NltUTII  AMKUK'A 


[I'AllT  ir. 


a 


H 
f  I 


■)■■ 
a  .1 


Jf(flc.  Very  ImiHlsiMncly  sliiiiiiijr,  ^rccii,  the  aldloiiicn,  exccpt- 
iiiu;  the  two  last  sojjiiu'iits,  g-ikli'tl.  I'rolioscis  diiijry  yellow,  (he 
Kiiiall  ]m]\n  black,  wilii  white  hairs.  Vnvv.  without  hairs,  dusted 
with  white.  Antenua;  entirely  Idaek.  kuuiII  ;  the  se(!oiid  joint 
with  short,  minute  bristles;  the  arista  itselt"  of  only  moderate 
lenj.';tli.  l''ront  with  the  usual  black  bristles,  Avhieh  have  but  a 
incjderatc  l»:'}fth,  otherwise  bare.  IJristles  upon  seutelluni  and 
thora.x  of  moderate  length;  upon  the  latter  there  are  only  two 
bristles.     The;  black  hairs  of  the  abdomen  are  very  scattered,  and 


tl 


le  black  Iiristles 


bef( 


'ore  its  incisures  are  rather  short.     The  small 


hypopyjrium  is  black  ;  its  external  appendajres  are  very  narrow, 
black,  and  with  black  hairs.  Fore  coxie  pale-yellow,  with 
scattered  and  rather  sh«)rt  whitish  hairs,  and  beset  with  several 
white  bristles.  Middle  and  hind  coxiu  black,  i'eet  very  Ion;; 
and  slender,  i)aIe-yellow.  Femora  slender,  upon  the  under  side 
sparely  frinj^fd  with  short,  minute,  whitish  hairs.  Tibije  likewise 
very  slender,  without  bristles,  with  a  very  short  Idack  i»ubeseence, 
which  is  diver<iMn<!^  fring'e-like  on  the  middle  tiliise  and  is  much 
closer  upon  their  under  side.  Fore  tarsi  extit'Uiely  slemler,  more 
than  once  and  two-thirds  the  lenjrth  of  the  tibiie;  their  first  joint 
alone  .'somewhat  lonjfcr  than  the  tibiie,  brownish-yellow  ;  the  follow- 
ing joints  brownish-l)lack  and  of  decreasinj^  lenji^lh.  Middle  tarsi 
likewise  very  slender,  about  once  and  u  half  the  len<^th  of  tli- 
tibiiu  ;  their  short  black  jndiescence  diverjfinjr,  so  t'.iat  it  appears 
fring'C-iike ;  their  first  joint  brownish-yellow,  at  the  extreme  tip 
brownish-black  ;  the  fidlowinjif  joints  brownish-black  and  of  de- 
creasiiiji^  leuf^th.  llintl  tarsi  nearly  as  long  as  the  tibite;  first  joint 
brownish-yellow,  and  but  little  lontrer  than  the  following  joints 
taken  together;  the  latter  brownish-lilack  and  of  decreasing  length. 
All  the  tarsi  entirely  without  bristles.  Ilaltercs  pale-ycUow  with  a 
blackish  peduncle;  teguhe  blackish  with  whitish  cilia.  AVingson 
the  anterior  margin,  from  their  basis  to  the  tip  of  the  second  longi- 
tudinal vein,  regularly  ciliated  with  rather  stout,  minute,  black 
hairs;  the  third  longitudinal  vein  rather  distinctly  curved  hack- 
wards  at  its  end  ;  the  anterior  branch  of  the  fourth  longitudinal 
vein  diverges  from  it  at  a  neai-ly  right  angle  and  turns  then  at  a 
very  rounded,  somewhat  obtuse  angle  towards  the  margin,  which 
it  reaches  very  near  before  the  apex  and  n^;  far  from  the  tip  of 
the  third  longitudinal  vein;  posterior  transverse  vein  rather 
oblique  and  somewhat  inflected. 


rsii.ui'i-.s. 


21» 


Fcinnlr.  Tt  rt'sciiiblcs  tin;  iiial(!  very  inucli,  still  tlic  pnbpsrence 
nnd  hristli's  of  tint  IkmIv  art;  slidrltT,  iilso  llio  aiitrrior  iinirf^iii  of 
tlio  wiiijjf  is  not  <'il!atc(i.  Tin.'  dclicato,  miniito  white  liairs  upon 
the  utidcr  si(l(!  of  tii(!  femora  are  hardly  iKTccptildc.  Middle  tihisu 
Willi  a  liiiicli  shorter,  not  diver<rin<]^  puhesceiire,  but  with  a  few 
iiMimtc!  hlaek  bristles,  which  are  not  to  l)e  foniid  in  the  ^  'I'arsi 
somewhat  shorter,  otherwise  of  a  sinnhir  strnetnre,  still  the  middh; 
tarsi  only  with  a  «|uite  short,  not  diverffinfr  piilx'seenee,  and  the 
first  joint  of  thi'  hind  tarsi  fully  as  lonfr  as  the  four  following 
joints  taken  tojrether.     Teiruhe  sometimes  rather  yellowish. 

JJab.  -Middle  States.     (Osten-Saeken.) 

B.    77(C  Iwnjirsf  Joints  of  Iho  (inlrnmr  jtale. 

A.   Fore  ft-mora  in  hulk  sires,  or  at  least  in   the  vhiJc,  witlioiit  yrllow  tfinrnfikf. 
hi-isll(  s  iijion  the  under  slilt'. 

1.  Abilouieii  not  yellow  at  the  basis. 

16.  P.  palleilH  WiKD.  1  and  9. — Kx  viridi  cinert-ns,  opapus,  pro 
bosciiltf,  palpirt,  iluobus  priniis  anteniiarum  articulis,  ventre,  coxis  jiedi- 
basque  tlavis,  coxis  posti^rioribus  fiiscii-niaciilatif'. 

^.  Tarsorum  antiooruru  articmlo  (luarto  subdilatato,  alltido. 

5.  Infero  femoruin  anticorum  latere  setis  validis  flavis  annato. 

Oreenisli-gray,  witlioiit  lustre,  balterps,  palpi,  tlie  two  first  joints  of  the 
antenna!,  the  venter,  the  coxa*,  and  the  feet  yellow,  the  four  jiotiterior 
coxie  spotted  with  l)rown. 

% .  The  fourth  joint  of  the  fore  tarsi  sliehtly  enlarged,  whitinh. 

5.  Under  side  of  the  fore  femora  bearing  stout  yellow  bristles.  Long. 
Corp.  0  23— 0.2G.     Long.  al.  0.22—0.24. 

Sin.  Psilopus  paUe.ns  Wiedemann,  Auss.  Zweitl.  II,  219,  11. 
Psihiftiis  iiUioiiotntiis  LoEw,  Neiie  Heitr.  V,  4. 
Psilopus  pitlhns  Loew,  Neue  Beitr.  VIII,  97,  17. 

Male.  Everywhere  closely  covered  with  a  grayish  or  whitish- 
jrray  dust,  from  below  which  the  metallic  bluish-<rreen  ground  shines 
distinctly,  although  not  strongly,  through.  Proboscis  brown  ; 
palpi  whitish-yellow.  Face  broad,  without  hairs,  very  cloficly 
covered  with  white  dust.  The  two  first  joints  of  the  antenna3 
yellowish,  the  second  beset  with  very  short  minute  black  bristles : 
third  antennal  joint  brown,  rounded  ;  arista  proportionally  short. 
Front  with  a  close  white,  round  the  f)cellar  riil)ercle  with  brownish- 
gray,  dust,  without  hairs,  the  usual  black  bristles  upon  it  of  uiedium 


III 


U"' 


^t\' 


m 


M' 


m 


!J^  ;!; 


J7fl 


DIITFUA  OF  NOUTII  AMKUICA. 


[I'AUT  II 


h 


h 


!■    I* 


Icti^tli.  Tltt>  n|»ii(|iK>  tliDi'ux,  (lusttMl  with  ^I'liyisli,  has  two  Iwn^i- 
tii*liiml  liiu's,  distant  IVoiii  nich  otlicr  (i|m)ii  the  iiii(l<lh>,  iiml  iwu 
other  iiic()iii|ilfli'  inii^,-itii(liiiiil  iiiirs  nt'  a  lirowii  nthtr,  ucciiiiyiii}; 
ihu  place  ol'  the  hiteral  stripes.  iJristies  of  the  tliorax  pntporiinti- 
iiily  short,  Sciitelhim  with  two  bristles.  'I'lie  aluloiiieii,  »iii>ieil 
willi  grayish  and  rather  opaipie,  Inis  upon  tlie  seeond  se^rmrnt  u 
hu'fre  liiaekisii,  triaii^idar  spot,  with  its  point  directed  hackwanU  ; 
upon  eacli  of  the  t'oiiowing  segments  tlu>re  is  a  siniihir  spot,  which 
is  connected  witii  tiie  rather  narrow  Itiaciv  anterior  nnir^in  of  the 
scffnient,  and  the  cohir  of  wiiich  is  ciianfrinjf  from  a  dusivy-lironzcs 
into  frrayisii-^rrcen.  The  structure  of  the  hypopygium  and  of  its 
appenda;ji:es  is  nearly  as  in  J'.  alhij'rini.<  Meij;'. ;  the  external 
appenda;:'es  are  hardly  half  so  long  as  the  inner  ones  and  ha\(> 
the  form  of  a  small  elliptical  lamella:  their  color  is  brown,  their 
pubescence  near  the  basis  more  delicatif,  shorter  and  pale,  at  the 
tip  coarser,  hmj^er,  and  black;  the  inner  appeialajres  form  a 
brownish-yellow  forceps,  (lark-l)rown  at  the  tip.  (Vtxa'  and  feet 
yellowish,  still  the  middle  and  hind  coxtu  rather  broadly  infuscaled. 
Fore  coxiu  beset  only  with  u  delicate,  nioilerutely  lonjr,  yellowish- 
white  pubescence,  without  stouter  bristles.  All  femora  slender, 
upon  tlie  under  side  very  glabrous  ;  the  I'vw  pale  hairs  which  are 
to  be  found  there  are  extremely  short,  and  tlierefore  hardly  pcr- 
ceptil)le.  Pubescence  of  all  the  til)iiu  very  short,  that  of  the 
middle  tibiiu  somewhat  h)iiger  uiid  more  diverging.  F(»re  tiliiie 
upon  the  upper  side  with  a  few  slender  minute  bristles,  one  of 
which  is  inserted  at  their  tip.  Middle  tibitf  generally  iidnscated 
upon  the  two  hist  thirds  of  tlieir  upper  side;  upon  their  ante- 
rior side,  not  fur  from  the  basis,  a  more  i)erceptil)le  small  black 
bristle  is  inserted;  otherwise  tliey  are  without  bristles.  Hind 
til)i.e  with  a  few  very  sumll  bristles  at  the  tip,  otherwise  ns  good 
as  without  bristles.  Fore  tarsi  slender,  double  the  length  of  the 
tibiio  ;  their  first  joint  somewhat  longer  than  the  til)ia;  the  three 
following  joints  of  nearly  the  same  length;  the  fourth  joint  some- 
what flattened  from  the  sides,  whitish  ;  fifth  joint  only  about  half 
as  long  as  the  fourth,  dark-brown.  Mi<ldle  tarsi  once  and  a  half 
the  length  of  the  tibiie,  slender;  the  first  joint  distinctly  longer 
than  the  following  taken  together ;  the  latter  of  a  decreasing 
length,  the  last  one  infuscated.  Hind  tarsi  somewhat  shorter 
than  the  tibiie,  their  first  joint  distinctly  shorter  than  the  second, 
the  last  one  somewhat  infuscated.    Ilalteres  yellowish ;  teguhu  with 


V 


n  ?i 


rsii.ons. 


niTiiw  liliick  1iMnl<'r  iiinl   vrl|(i\vi>li-wlilt('  cillu.      Wiiiir<  ru'liir 


Iiirirc,  111'  nil  <'lli|itiriil  niiiliiic,  tiiiji'i'd  wiili  limwiiiNli-jriiiv  ;  tlif  iliinl 
lnii<riliiiliii!il  vi'iii  is  Init  littlr  ciirvcil  l)ii<k\V!irils  nt  tin*  ciiil  ;  tlio 
iiiiti  rior  iirnin'li  ortlir  I'niirtli  liiii<riliuliiiiil  vriii,  llir  nri.jii-  nf  wliicli 
lii's  iM'iin-r  til  the  i»nsirriMr  iriiiisvcrsc  vt-iii  tliaii   tn  'In-  iiiiirj/iii  nf 


iIh'  wiiil'",  Ifiivcs  tins  vein  tit  nil  itldiist'  iiiiiiM'.  iiiid  turns  ,11  n  Ihit 
curve  luwanls  tin*  innruiii,  wliicli  it  rcnclics  n  little  helure  .lienpex 
mill  imt  I'tir  IVmiii  tin;  tip  of  the  tliini  Iniiu'ituiliiiiil  vein  ;  tlie  |>ii<.te- 
rinr  triiii>verM'  vein  lies  iirupitrtiuiiiillv  I'jir  iiwnv  from  the  niarniii, 
is  iiiit  liiuiiei'iiteiy  )ii)li(|iie  ami  not  ilitleeted. 

Fiiiiiili'.  It  resemliles  tiie  (^  veiT  liliir-Il,  )iut  shows  the  rnlhiw- 
iiiir  (lilVereiiees  :  The  eitlor  of  the  (hist  iiiiitii  jioiit,  thorax,  siiiti!- 
liiiii  ami  alHloiiieii  is  more  yeihtw-jrrayish.  The  IdaeKi.^li,  triaiijiii- 
lar  <lor>al  spots  of  llif  aliilomeu  are  imli>liiiet.  'I'lie  Inre  eo.\n! 
have,  besides  the  yellowi>li-\vhitc  plllieseeiiee,  on  the  iiiliei'  and 
outer  maru'in.  as  also  at  the  tip,  iiiimeroiis  yellow  lirislles.  Feet 
shorter  and  of  stouter  struetiire  than  in  the  ^.  I'piui  the  liiM 
lialt'  of  the  under  side  of  the  fore  femora  there  are  live  diverjiiiii; 
stout  thorndike  hristh'S  of  veijow  color.  All  the  tiliia-  are  siiardv 
heset  with  siiitrle  Itlack  Itristlcs  of  medium  leiitith.  Tar,-i  di.-- 
tiuctly  sliorter  than  in  tiie  ^ ,  from  the  third  Joint  iiifii>catcd, 
the  last  joint  dark  l»rown,  the  sec(Uid  to  fourth  joints  of  the  lorn 
tarsi  decreasiiiL'  in  leiijrth  more  rapidly  than  in  the  ^ .  W"\\\y[<. 
somewliat  smaller  and  less  ohtiise  than  tliose  of  the  j^ ;  tke  iieiira- 
tioii  does  not  show  any  jicrceptilile  dilfereiice. 

J[iih.  New  York.  (Osteii-Sackcn,  wlio  found  it  frerpieiitly  in 
fTiiiie  !>ii(l  .Inly  in  tiie  iMiildinu's  near  tlie  Howiinjr  (Jreeii  and  the 
IJattery,  011  walls  and  windows  in  tiie  rooms.) 

()l).<rrriilii»)  I. — Tlie  ju'esciit  species  is  not  only  an  eiitirelv 
Kiirojiean  form,  liiit  also  witliout  tiie  least  doiilit  jierfectly  identi- 
cal with  /'.  (ilhdiintdliis,  which  I  iiavc  discovered  at  IJliodiis  and 
descrilied  in  "  AV"«'  //'///•.  V."  Tiie  comparison  of  two  ^  of  the 
latter  witii  several  ^  of  /'.  jiallois  shows,  that  tii  're  is  no  pcr- 
ceptilile  ditVereiice  lietweeii  tlieiii. 

Olmrrni/inn  '2.  —  At  the  Imperial  Miisouiu  in  Vienna  there  are 
two  specimens  of  /',  jialhun  marked  "New  Holland."  Tiic 
simultaneous-  existence  of  tiie  sjiecie."''  in  North  America  and 
Kui'ope  niij:lit  had  to  liclieve  in  tiie  iiossiliilily  of  its  also  occiir- 
riiiir  in  New  Holland.  However,  my  reasons  for  doiihtin^-  tiiis  at 
present  are  as  follows  :  tiic  pins  ijoaring  these  specimens  are  easily 


i  <\', 


t 


K 


m 


t 


I"  ) 


i-: 


TT 


27S 


niPTKIlA  <>V  NdUTir  AMKUICA. 


[I'AKT  11 


(listiii^ruislicd  from  others,  itti<l  amonj;  all  tin*  (tthcr  DnfiihoimtliJie 
of  llic  collection,  there  are  only  two  Kpeeiniens  on  Hiniilar  pins,  and 
Itoth  are  also  marked  "  Xew  Holland."  A  most  careful  compa- 
rison of  the  latter  specimens  showed  that  they  are  /',  m/iho  Say. 
This  circumstance  renders  it  very  probalile  that  thoro  was  a  nds- 
tako  in  the  btatement  uf  Ihu  hahitut. 


II 


mi;  > 


2.  Abdomen  at  tlio  basis  yellow,  not  roetallio. 

a,  Taiai  for  the  moHt  part  black. 

It.  P.  VnriPRatllH  Lokw.  9.— Viridi,  clialybeo  et  onprco  varhis, 
iiindiet)  nitens,  iticlxwiido,  palpis,  i)riMiis  duobua  ant»innainin  articulis, 
al)d<miinis  basi,  veiitr*!  pt'dil)u«(iuo  Uavis,  coxifl  iMtorm«cliis  einoieo. 
niaculatis,  tarsis  ex  fuscu  nigria, 

Ore«n,  Hteel-blue  and  eoppt-r  colored,  variegated,  moderately  shining;  pro- 
boscis, palpi,  the  two  lirst  joints  of  the  antennip,  the  basis  of  tbe  abdo- 
men, tbo  coxa-  and  feet  yellow  ;  middle  coxw  spotted  with  gray  ;  tarsi 
brownish-black.     Long.  corp.  0.21.     Long.  al.  (».20. 

Sy.v.  P^ilojiiis  vtiiirgittus  LoEW,  Neue  Beitr.  VIII,  95,  14. 

(Jreen,  the  most  jmrt  of  the  upper  side  of  the  thorax  and  the 
anterior  i)art  of  the  sinjjle  sej^^ments  of  the  al)domen  copjtery-rcd, 
tiie  front  and  scutellum  blue.  The  lustre  of  the  f,'ronnd-eolor  is 
moderated  by  a  slifrht  whitish  dust.  Face  prcciush-blue,  closely 
dust(!d  with  white,  reaching  more  downwards  than  usual ;  without 
hairs.  Proboscis  and  palpi  yellow.  The  two  first  antennal  joints 
yellowish,  the  second  with  very  short  minute  black  bristles ;  the 
arista  dorsal,  moderately  lonjjf.  Front  blue,  slightly  dusted  with 
white,  without  hairs ;  its  usual  black  bristles  of  a  moderate 
length.  The  upper  side  of  the  thorax  shows  two  longitudinal 
lines  of  a  coppery-red  color,  which  are  separated  by  a  broad  green 
stripe;  each  of  them  coalesces  with  a  large  coppery-red  lateral 
s|)ot ;  the  ui)per  side  of  the  thorax  is  very  probably  not  so 
variegated  in  all  specimens.  The  black  bristles  of  the  thorax  of 
medium  length.  Scutellum  blue  with  a  green  tip ;  the  pair  of 
bristles  inserted  near  its  tip  is  rather  large,  that  nearer  to  the 
basis  is  more  slender  and  much  shorter.  Pleura;  rather  closely 
dusted  with  white  ;  their  hind  margin  colored  with  yellow.  The 
first  segment  of  the  al)domen  yellow,  near  the  basis  blackish,  on 
the  hind  nmrgin,  excepting  the  middle,  metallic-green  and  fringed 
with  a  row  of  long  black  bristles  j  the  basal  third  of  the  second 


1'S1|,(»1'IS. 


scjfmont  niul  <ni  i-ndi  siiU;  u  laitTuI  spot,  yellow  ;  olIuTwisc,  tliu 
alMloiiicri  is  nictiillic-^''i'L'i'ii,  iit  tin-  l)ii.sis  of  tli*<  sr^iiu'iits  liunilsoiiiii 
(•op|i».'ry-r('(|,  jiltujicllicr  « ovcrcd  willi  ii  >li);lit  \vliili>li  (lu>|.  'I'lit! 
|)iilios(.-i-iict'  of  tli(.>  lii'st  sr^rijD.iit  ,,\'  tlic  ii ImIomd'Ii  is  wliitisli  uml 
(k'licatc,  upon  tlif  rciiiiiiiiiiiv^  ><'^'iiit'iil.s  it  is  cournrr  iiiid  lilar|{  ;  tlii; 
iniiiiitc  Itlack  ItristJcs  licfnrL'  tlie  m'coikI  aii<l  licforc  llic  fnliowiiij^ 
si'friMcnls  (litfcr  Imt  little  from  the  rcniaiiiiiif,'  piilx'scciicc.  Vvu- 
tor  j'ollow,  with  a  very  scaltoivd  ami  short  piiht'sj-i'iirc,  wliirli  has 
near  its  )msis  iv  whitish,  towards  its  end  u  lilack  color.  Korc 
coxiu  yidlow  with  a  rather  short  whitish  pnlH'seeiiec  and  with  u  few 
stout  whitisli-yell(»w  liristles.  Middio  and  hind  coXiu  likewise  yel- 
low, still  the  lirst  with  a  jjray  spot,  whieh  covers  the  lar^'er  part 
of  its  outside.  Femora  y(dlow,  upon  the  under  side  with  a  hardly 
disliiit't  whitish  pulteseence ;  the  foremost  with  a  sinjrle  Idack 
bristle  inserted  upon  the  (tutside  not  far  from  the  basis.  The 
middle  tibiie  liav  '  a  more  distinct  minute  iiristle  upon  tlit;  frotit 
side  near  the  basis  and  a  i'vw  at  the  ti|»,  besides  some  snndl  ones 
upon  the  hind  side;  the  hind  tiltiiu  have  upon  the  front  side,  not 
far  from  the  basis,  also  one  stout  l)ristle  and  some  ipiite  s.nall, 
hardly  percei)tible  ones  u)»ou  the  upper  and  under  side.  Fore 
tarsi  aljout  once  and  two-thirds  the  leii^rih  of  the  til)ia';  their  lirst 
joint  alone  of  tlie  same  lenjjth  as  the  til»ia',  bnnvnish-yellow  ;  the 
following  joints  browidsh-black  and  of  decreasing  length,  still  the 
third  but  little  shorter  than  the  second.  Middle  tarsi  once  and 
a-half  the  length  of  the  tibiiu,  of  the  same  C(doring  and  structure, 
only  the  first  joint  iiroportionally  somewhat  .shorter.  Hind  tarsi 
but  little  shorter  than  the  til»ia',  brownish-black,  at  tht(  ba.-is  niori; 
yellowish-brown,  the  first  joint  not  (piite  as  long  as  the  second  and 
third  taken  together,  llalteres  yellowish;  tt'guhe  with  a  very 
narrow  black  border  and  whitish  cilia.  'I'he  third  longitinlinal 
vein  of  the  wings  distinctly  curved  l)ackwards  near  its  end  ;  the 
anterior  branch  of  the  fourth  longitudinal  vein  diverges  iit  a  rather 
acute  angle  and  turns  then  at  a  very  rounded  right  angle  towards 
the  margin,  which  it  reaches  somewhat  before  the  ape.\  near  the 
tip  of  the  third  longitudinal  vein  ;  hind  transverse  vein  strikingly 
oblique,  not  sinuated. 

Hub.   Florida.     (Ostcn-Saoken.)     Cuba.     ((Jundlach.) 
ObHcrvatinn. — /'.  vnricijatus  is  very  like  the  9    of  P.  i»tiffn- 
cinitit.     The  proportionally  huiger  wings,   the  dirt'erent  position 
of  the  bristles  of  the  scutellum,  the  much  darker  coloring  of  the 


rti. 


■:iii' 


L    r 


'1     .1 


■    :.'-■ 


2S0 


DIPTERA  OF  NOIlTir  AMKKICA. 


[PAUT  II. 


H 


tiirsi  and   llic  in'oportioimlly  sciiicwliat  lesser  leiij^th  of  llie  (irst 
joint  of  (he  liiiid  Uirsi  seem  to  prove  its  distiriotiiess  sufliciently. 


;   If 


f  1? 


li.  Tarsi  but  littlo  iiifuscated  towards  tlio  end. 

a.  All  the  coxa'  uiitirely  y«llow. 

IS.  P.  l»i€"Olor  liOK.w.  9- — Viridis,  iiitidissiinus,  proliospido,  paljiis, 
dtioiiiis  priiiiis  anttMiiiuruni  articulis,  abdominis  ba^i  et  mauulis  laterali- 
bus,  vcntri',  coxis  ii<'(lil)us(iuo  llavis. 

(Jn-cn,  v<'iy  sliining;  ])rol)oscis,  palpi,  the  two  first  joints  of  tlie  antenna-, 
the  basis  of  the  abdoinen  and  spots  on  its  si<le,  venter,  coxa)  and  feet 
yellow,     bong.  eorp.  0.1:5 — 0.14.     bong.  al.  0.115 — 0.14. 

Svx.  J'silii])ii!i  hicdior  boKW,  Neue  Keitr.  VIII,  !)(!,  15. 

(Jreen,  very  shiiiintr.  I'iilpi  and  proljoseis  yellow.  The  <rhi- 
itrons  face  and  the  front  l»inish-fi;reen,  the  former  rather  eiosely 
dusted  with  wiiite.  Ihe  latter  with  (he  tisiia!  liiaeU  l)ris(les,  whieii 
have  hnt  an  insiiinirieant  lenudi,  otherwise  without  puheseenee. 
'Pile  two  lirst  joints  of  (he  antennse  yellowish;  the  second  with 
only  extremely  short  niiiude  Idack  hairs.  The  black  hrisdes  of 
(he  (liorax  short.  Scidelluin  wi(h  only  ('vo  loii;>;  black  brisdes. 
Pleura'  closely  dusted  with  wlii(e,  (heir  hind  marfiin  yellow.  First 
se<i'men(  of  (he  abdomen  yellow,  with  a  shininji-  <>;reeii  hind  mar- 
gin ;  (he  second  seti'inent  likewise;  yellow,  with  Ji  very  lar,ti-e  nn'tallic- 
H-reen  spot,  which  only  leaves  unoccnpied  (he  basal  one-(hinl,  \\w, 
anterior  corner  and  the  lateral  maririn  ;  \\\v  two  following  seu- 
ineiits  ship.ing  green,  with  a  yellow  anterior  corner  and  yellow 
hUeral  nmrgiit  ;  (he  lil'th  segment  oidy  with  a  yellow  hUeral  nnir- 
gin.  A'enter  entirely  yellow.  IMie  ]MiI)eHcenee  of  (he  abddmen 
is  scarce,  delicate  and  shor(.  upon  its  npper  side  black  ;  (he  minnie 
l)lack  bristles  before  (he  incisures  arc  so  short  that  they  distinguish 
themselves  but  litde  from  the  renuiining  pubescence.  All  (he  coxa' 
and  the  very  glabrous,  huig  and  slender  fee(  pale  yellowish.  Fore 
coxa'  with  a  shor(  whidsh  pubescence  and  wi(h  a  few  hair-like 
whitish  l)ristles.  Vuder  side  of  the  fore  femora  with  ex(remely 
shor(  minide  whitish  hairs,  under  side  of  the  mi«hlle  and  hind 
femora  glabrous.  Fore  lil)ia!  entirely  without  brisdes;  middle 
and  hind  (il)ia'  wi(h  o\w  short  niiuute  black  brisd-;  upon  (he  ou(- 
side,  not  far  from  (he  basis  and  with  some  similar  minule  bris(le^^ 
at  (he  tip.  Tin;  very  slemler  fore  tarsi  over  once  and  two-(liirils 
the  length  of  the  tibiie ;   their  lirst  joint  a  little  longer  tiiaii  (he 


PsiuiPt  :s. 


2H1 


tiliia,  the  fnllowinjif  JMiiits  of  n  (Iccrcasinjy  Iciiirtli,  tlic  liflli  juiiit 
intuscatcd.  The  slciidi'i*  initlilU;  tarsi  nearly  oiict'  and  a-lialf  llie 
Iciif^tli  (tf  tlio  liltia';  tlicir  lirst  joint  (iistiiictly  sliorlcr  tiian  tlic 
tii)ia;  the  folluwiiiir  (incs  of  (Iccrcasiiij!:  Iciijrili,  tlic  last  ont'  sitiiic- 
wliat  iiil'iiscatfd.  Hind  tarsi  alxtut  tlircf-loiirtlis  tlic  Icii^Mli  of  the 
tiliiu' ;  their  first  joint  lonjrer  than  the  followin}^  taken  toirether; 
these  are  of  a  decreasinj^  lenfrth,  somewhat,  infiiscated,  still  only 
the  hist  is  really  lirown.  The  i)nl)eseeii(e  of  all  the  feel  is  of  a 
rather  strikinji^  shortness  ;  its  color  npon  the  under  side  of  the  liliia! 
and  tarsi  is  not  Mack,  allhonfih  they  take  IIk^  appearance  of  tids 
color  in  some  relleete(l  liirht.  Ilalteres  pale-yellowish  ;  tejinhe  with 
an  e.\cec(linj:ly  narrow  lilack  horderand  with  yellowish-while  cilia. 
The  third  lonjritudinal  vein  of  the  winjrs  curved  jrently  backwards 
at  its  tip;  the  anterior  branch  of  the  fourth  longitudinal  vein 
diverjjres  from  it  under  a  rather  acute  an}ile  and  turns  then  al  a 
rounded  rijilit  aiifile  towards  the  mart!:in,  which  it  reaches  ininie- 
diately  before  the  extreme  apex,  near  the  tip  <jf  the  third  lonjfi- 
tu<linal  vein  ;  the  hind  transverse  vein  very  oblitpie,  little  inllected. 
Hub.  Middle  .States.     (Osten-8acken.) 


u 

f.  1 

\.  ■ 

■•  )\  ■■  ■', 

i 

-  ^»' 

!  ;/(■'    .'j 

w 

)  ■■     ■  ■      ■» 

i  : 

■■\ 

B.  Middle  coxa;  gray  witli  yellow  tip. 

If).  P.  pHittnc'iillls  Li)i;\v.  %  and  9- — Aureo-viridis,  >nodi(!t>  nitens, 
j)rot)()s(!id'',  jialpis,  diiolius  inimis  aiiteniiaruni  articulis,  abdominis  liasi, 
V('iitr(?,  coxis  aiitii'is  i)osticis(iiH!  et  in'tlilms  Ihivis,  coxis  interiut'diis  cinc- 
rei.s,  in  apico  llavis. 

^  .  Alariuu  costil  eoncavil,  bnn-iter  (dliatil. 

J.  Alaruiu  codta  ni^c  coiicavii,  uea  ciliata. 

Golden-given,  moderately  shining,  proboscis,  palpi,  the  ♦wo  first  joints  of 
tlu!  aiiteiin.T,  the  basis  of  the  al)(b)nien,  the  venter,  the  fore  and  bind 
coxjc,  as  also  tbe  feet,  yellow  ;  the  middle  eox;e  gray  with  yellow  tip. 

^.  The  ant(M'ior  margin  of  tlie  wings  tieieave,  with  a  fringe  of  sliort  cilia. 

9  .  TIu!  iiiiterior  margin  of  the  wings  neither  concave  nor  ciliated.  Long. 
Corp.  (1.2(1—0.22.     bong.  al.  O.IK— 0.2(t. 

Syn.    I'siloints  jisitliicinns  Loi-.v,-,  Neue  liiMtr.  VIII,  iKi,  Id. 

Mule.  (lolden-grt  en,  moderately  shiidnjr.  I'robo.seis  and  palpi 
yellow  Face  greenish-blne,  closely  dusted  wiih  yellowish-jfray, 
reaching  much  downwards,  with<iut  hairs.  The  two  first  joints 
of  the  antenn;c  yellowish,  the  second  with  very  short  ndniiie  black 
bristles.  The  arista  d(»rsal,  moderately  lon<^.  Front  blue  or 
bluish-green,  with  a  grayish-yellow  or  nearly  whitish  dust,  without 


>.  I] 


,'■.    t 


1, 
■  i' 


iilSl 


i'.'l 


•  Ml;' 


1*1  s; 

I!'  i< 


i  ■: 


289 


DIPTEHA  OP  NORTH  AMERICA. 


[part  II. 


hairs,  its  usual  black  bristlos  of  a  very  moderate  length.  Thorax, 
scutt'lluiii  aiitl  ul)(loineii  with  a  slight  yellowish  dust,  which 
moderates  the  lustre  of  these  parts.  The  Mack  bristles  of  the 
thorax  of  moderate  length.  The  scutellum  has  only  the  pair  of 
bristles  at  the  tip,  which  is  of  a  consideral)le  length  ;  immediately 
near  each  bristle  of  this  pair  a  much  shorter  black  hair  is  inserted 
towards  the  outside.  Pleune  black  with  a  green  reflection  and  with 
a  grayish-white  dust ;  their  hind  margin  gray  or  at  least  only  in 
part  yellowish.  Abdomen  green,  towards  its  end  generally  some- 
what gilded  ;  the  fuvt  segment  yellowish,  at  its  basis  blackisli,  on 
the  hind  margin  metallic-green;  on  the  second  segment  the  ante- 
rior margin  and  corner,  sometimes  also  the  lateral  margin,  yellow; 
the  third  segment  has  generally,  on  the  anterior  i)art  of  the  lateral 
margin,  an  elongated  yellowish  sjujt.  The  scattered  ind)esceiice 
of  the  abdomen  is  rather  delicate  and  long ;  ui)on  the  upper  side 
it  is  black,  whitish  only  upon  the  first  segment ;  the  pubescence 
of  the  venter  is  whitish  near  its  basis,  but  ))ecomes  gradually 
darker  towards  the  end.  The  black  bristles  before  the  incisures 
of  the  abdomen  of  a  very  moderate  length.  The  external  append- 
ages of  the  hypopygium  small  and  very  narrow,  brownish-yellow. 
Fore  and  hind  coxie  pale  yell()w,  the  former  with  a  shorter  and  more 
delicate  whitish  pubescence  and  with  a  few  light-yellowish  bris- 
tles; middle  coxte  gray  with  pale-yellowish  tip.  Feet  yellowish. 
Femora  slender,  upon  the  under  side  si)arely  fringed  with  i  xceed- 
ingly  short,  minute  whitish  hairs;  besides,  upon  the  second  half 
of  the  under  side  of  the  middle  femora  there  is  a  sparse  row  of 
minute  b'ack  hairs.  Tibiie  slender  and  long ;  the  usual  black 
pubescence  of  the  fore  and  hind  tibite  is  very  short  and  appressed, 
that  of  the  middle  tibia;  somewhat  longer  and  more  erect,  there- 
fore almost  fringe-like.  The  fore  tibiie,  with  the  oidy  exception 
of  a  rather  small  minute  bi.ick  bristle,  inserted  upon  their  outside, 
near  the  basis,  are  entirely  without  bristles.  The  middle  til)iie 
bear  no  bristles  whatever,  distinguished  from  the  other  pubescence. 
Iliad  tibiaj  upon  the  front  side,  not  far  from  the  basis,  with  a  rather 
apparent  little  bristle,  whilst  those  upon  the  upper  and  under  side 
are  less  numerous,  extremely  small  and  therefore  more  difiTicult  to 
perceive.  Fore  tarsi  slender,  nearly  twice  as  long  as  the  tibial ; 
their  first  joint  for  itself  alone  somewhat  longer  than  the  til)ia, 
the  following  ones  of  decreasing  length,  the  last  one  brown.  !Mid- 
dle  tarsi  slender,  about  once  and  a  half  the  length  of  the  tibia) ; 


*n.\i: 


psiLOPua. 


tlie  first  joint  distinctly  shorter  than  tho  tibia,  upon  its  front  sido 
somewhat  sparsely  eiliated  with  ohlique  minute  black  liairs  ;  the 
followiii}^  joints  only  with  the  usual  short  pul)eseence  and  of  de- 
creasing length,*  the  last  one  dark  brown.  The  length  of  the  hind 
tarsi  somewhat  exceeds  three-fourths  of  the  tibia' ;  their  first  joint 
is  oidy  somewhat  longer  than  the  following  taken  tugcther  ;  these 
are  of  decreasing  length,  somewhat  infuseated,  still  only  the  last 
one  dark  brown.  Ilalteres  light  yellow  ;  teguhu  with  extremely 
narrow  black  margin  and  with  yellowish-white  cilia.  Wings  with 
brown  veins;  the  anterior  nnirgin  is  gently  sinnated  upon  its 
larger  second  half,  ami  forms  l)efore  the  tip  of  the  second  longitu- 
dinal vein  a  i>rojecting  angle,  so  that  the  whole  wing  ac(piires  a 
quite  unusual  axe-like  shape  ;  the  whole  anterior  margin,  as  far  as 
that  angle,  is  delicately  and  eipuilly  ciliated  ;  the  third  longitudinal 
vein,  near  its  end,  is  turned  back  very  abruptly  and  un.isually  far; 
the  anterior  branch  of  the  fourth  longitudinal  vein  diverges  from 
it  under  a  rather  acute  angle  and  turns  then  in  a  curve  towards 
the  nnirgin,  which  it  reaches  not  far  from  the  tip  of  the  third  lon- 
gitudinal vein  ;  posterior  transverse  vein  rather  remarkably  oltlicpic, 
gently  sinuated  in  the  shape  of  an  S. 

Female.  It  resembles  the  male  very  closely.  besides  the 
lesser  length  of  the  bristles  on  the  whole  body,  and  besides  the 
somewhat  lesser  length  of  the  feet,  which  are  of  the  same  color  as 
in  the  J*,  there  are  only  the  following  diflerences  :  the  whole  hind 
margin  of  the  pleura;  is  colv-red  with  yellow.  The  middle  tibiiu 
are  without  the  longer  and  erect  i)ul)esccnce  of  the^,  but  their 
pubescence  is  short  and  appressed  as  on  the  other  tili;e;  there 
are,  however,  upon  the  front  side  near  the  basis  one,  and  at  the  tip 
of  the  tibiaj  a  few  more  distinct  minute  black  bristles,  l)esides  some 
smaller  ones  upon  the  hind  side.  The  anterior  margin  of  the  wings 
is  neither  concave  nor  ciliated,  the  wings  therefore  of  the  usual 
form  ;  the  third  longitudinal  vein,  near  its  end,  is  much  less  sud- 
denly and  much  less  strongly  curved  l)aekwards;  the  course  of  the 
anterior  branch  of  the  fourth  longitudinal  vein  is  somewhat  Icsa 
in  a  curve,  and  the  sinuosity  of  the  hind  transverse  vein  uot  so 
strong. 

Eab.  Florida.     (Osten-S^.L.    ) 


l''$ 
hM 


,M  :. 


m 


i; 


rs 


TT 


1 


284 


Dll'TERA  OF  NOUTII  AMEIUCA. 


[PAIIT  II. 


I 


•  1 


'! 


■    i'i 


!il 


!li 


■   ! 


In'' 


n.   Fare  femora  upon  the  under  stth  with  thornJike  bristles  in  both  sexes. 

1.  All  the  coxae  entirely  yellow. 

20.  I*,  teller  Lokw.  %  and  9- — Laete  viriilia,  proboscide,  palpis, 
piiniis  (lu(»l)us  antennaruni  articulis,  jileuraiuni  niargine  postico,  ab<lo- 
n.inis  liasi,  coxis  pcdibusciue  flavis,  oiliis  tegularnm  albicantibus,  alarum 
vt'iiii  transversa  poHterioro  valde  obliqui. 

%  .  Femora  antica  setulis  subtribus  arniata  ;  appendices  liypopygii  majus- 
cnla?  Uava?. 

9  .  Femoici  antica  setis  quatuor  validis  armata. 

Light  green,  proboscis,  palpi,  the  two  first  joints  of  the  antennw,  the  hind 
•nargin  of  the  plour.x,  the  basis  of  ihe  abdomen,  the  coxje  and  feet  yel- 
low ;  cilia  of  the  teguljo  whitish  ;  hind  transverse  vein  of  the  wings  very 
obli(iue. 

% .  Fore  femora  generally  with  three  minute  bristles ;  the  rather  large 
appendages  of  the  hyi)opygiu«u  yellow. 

9.  Fore  femora  with  lour  stout  bristles.  Long.  corp.  0.1(5 — 0.17.  Long. 
al.  0.22. 

SvN.   Psiiiijms  trner  LoEW,  Berl.  Ent.  Zeitschr.  VI,  217,  71. 

Tiij^lit  metallk'-grt'on,  ratlior  shining.  Probo.scis  and  palpi  yel- 
low, the  latter  beset  with  a  few  niiiiutc  bristles,  whieh  have  in  the 
%  a  whitish,  in  the  9  a  black  color.  Tlie  glabrous  face,  covered 
with  white  dust,  is  very  broad,  particuhirly  upon  its  upper  part, 
which  is  very  con"e.\.  Antennas  small,  tiie  two  first  joints  yellow, 
the  second  beset  with  a  few  short,  unnnte  black  hairs  ui)on  the 
upper  side  ;  ui)on  the  under  side  with  a  few  short,  nunute  white 
hairs;  the  very  i-mall  third  joint  is  generally  blackish,  still  it  has 
sometimes  a  much  lighter  coloring.  The  front  is  generally  sky- 
blue,  and,  l)esides  the  usual  black  Jn-istles,  without  pubescence. 
Upper  side  of  the  thorax  sometimes  more  blue  than  green,  rather 
distinctly  dusted  and  beset  with  but  a  moderate  nund)er  of  Ithick 
bristles.  Pleura',  in  conse(|uence  of  a  close  white  dust,  grayish- 
green.  The  scutellum,  which  has  two  bristles,  is  sometimes  green, 
sometimes  purplish-blue.  Abdomen  shining  light-green,  some- 
times rather  golden-green  ;  its  basis  is  in  the  9  alwavs,  in  the 
male  generally,  colored  with  yellow;  the  blnck  bristles  before  the 
hind  margin  of  the  single  segments  are  proportioimlly  short. 
Ilypopygium  blackish-brown  and  dusted  with  white ;  its  api)end- 
ages  are  pale  yellow  ;  the  external  ones  are  narrow  lamelhi?  and 
are  fringed  with  a  blackish  pubescence,  which  is  somewhat  longer 


PSILOPL'S. 


285 


at  tlicir  tip;  the  inner  ones  arc  sty  lifDrni,  distinolly  loiifjor  lliaii 
the  outer  ones  anil  friuji^ed  upon  tiieir  upi)er  side  witli  some  few 
minute  li;j;ht  hairs ;  tlie  stile-lilvc  eentral  orj^un  is  us  lonjr  us  the 
inner  uppenduges  and  is  siuootldy  eurved  downwards.  Tiic  eoxio 
and  the  long,  very  slender  and  very  glabrous  feet  arc  yellowish. 
The  fore  coxto  of  the  %  have  a  proportionally  long,  rather  close 
and  delicate  whitish  i>ul)escence  ;  in  the  9  there  are,  instead  of 
the  longer  hairs,  bristles  of  u  white-yellowish  coloring.  The  fore 
femora  of  the  %  have  ujion  the  under  side  near  the  basis,  three 
thin  yellowish  bristles  of  decreasing  length  ;  in  the  9  there  are  in 
their  stead  four  stout  yellowish  bristles.  The  hind  femora  of  the 
%  have  upon  the  upper  side  near  the  basis  a  few  long  and  very 
delicate  white  hairs,  which  f\re  not  present  in  the  ?.  The  plain 
and  slender  fore  tarsi  are  in  l)oth  se.xes  much  longer  than  the 
tibis"  •  they  arc  still  much  longer  in  the  %  than  in  the  9  ;  the 
first  joint  of  all  tarsi  is  very  elongated,  particularly  in  thw  Z  ;  on 
the  fore  tarsi  it  is  about  twice  us  long  as  the  following  joints  taken 
together,  on  the  middle  tarsi  about  three  times  as  long,  besides  they 
are  distinguished  by  their  slenderness,  and  apparently  comi)lete 
gIal)rousness.  The  hind  tarsi  in  Ixth  se.xes  are  nearly  as  long  us 
the  tibite,  their  lirst  joint  in  the  %  somewhat  longer  than  the  fol- 
lowing joints  taken  together,  but  in  the  9  somewhat  shorter. 
Tegulo!  on  the  margin  with  only  a  single  quite  small  Idack  dot; 
their  cilia  whitish.  "NVings  grayi.sh  hyaline,  long  and  narrow, 
towards  the  basis  still  more  narrowed,  particularly  in  the  %  ; 
their  anterior  veins  are  yellow,  the  posterior  ones  more  infuscated; 
the  anterior  branch  of  the  third  longitudinal  vein  is  very  long, 
rather  flat  and  but  little  curved;  the  posterior  transverse  vein  is 
far  remote  from  the  margin  and  has  a  very  oblique  position.  The 
%  possesses,  as  a  particular  distinctive  nuirk,  upon  the  under  side 
of  the  basis  of  the  wing,  a  crooked,  black,  rather  stout  thorn,  in- 
serted near  the  anterior  margin, 

Jlab.  Pennsylvania,     ((.'oil.  Winth.) 

Observation. — The  P.  ilelicaius  of  Afr.  Walker,  who  described 
a  9,  has  an  entirely  green  abdomen,  can  therefore  not  be  (cner, 
as  the  basis  of  the  abdomen  of  its  9  is  always  colored  with  yellow. 


i]ii|: 


r 


-J' 


wr 


28G 


II 


il 


M[ 


k 
I 


?;.^* 


DIITEUA  OF  NORTH  AMKUlfA. 


2.  Middle  and  hiud  coxio  Mackisli. 


[I'AUT  11. 


*2l.  P,  (ilipeH  LoKW.  %. — Oracilia,  loni,'ii»'s,  iiitidus,  capifo,  tliorace 
.scutf!l{)(]Ut'  chiilybeis,  abdoiiiiiie  viridi,  i)rob()scide,  duolms  juiiiiis  ai»- 
^ennanmi  aititulis,  coxis  i)('dilins(iuo  llavis,  ffiiiorum  intermediunuu 
l)asi  nigra,  tiliiis  iiitoriiiediis  t.irsi;;iiue  oiiiiiil)US  fuseis. 

Slender,  long-leggod,  sliiiiing,  lit-ad,  thorax  and  scutellnm  stool-blue,  ab- 
domen green  ;  proboscis,  tlio  two  first  joints  of  tliu  antennic,  coxa'  and 
feet  yellow,  still  the  basis  of  the  middle  femora  blackish  ;  middle  tibiiu 
and  all  tarsi  brown.     Long.  corp.  0.2(5.     Long.  al.  l>.2tj. 

Syn.  l'siloi>iisjUi)>es  LoKw,  Neue  Beitr.  VIII,  9!),  18. 

Of  slt'iulcr  shape  iuul  very  long-lofrf^ed,  sliiiiiiig.  IFead  ])ur- 
plish-liluo;  proboscis  yellow,  palpi  brown,  both  bosot  with  miiiiito 
lij^rht  hairs.  Face  without  hairs,  very  l)roa(l,  covered  with  deiiso 
yellowisli  dust ;  its  upi)er  part  is  (piite  unusually  convex.  The 
two  lirst  joints  of  the  antenna)  yellow,  the  second  frinj^ed  witii 
short  minute  white-yellowish  hairs  ;  the  snndl  third  joint  rounded, 
bntwnish-black ;  arista  dorsal,  proportionally  of  insit^nilicant 
leufjth.  Front  without  hairs,  with  grayish-yellow  dust,  which 
does  not  cover  the  shining  purplish  ground-color  upon  the  middle ; 
the  usual  black  bristles  of  moderate  length  Thorax  and  scutel- 
lum  shining  purpli.sh-blue,  with  a  yellowish  dust,  which  does  not 
cover  the  lustre  of  the  ground-color.  The  black  bristles  of  the  tho- 
rax rather  long.  The  scutellum  lias  but  two  bristles,  stiil  near  the 
lateral  corners,  on  its  margin,  some  long  hairs  are  inserted.  Ab- 
domen shining  green  with  a  very  slight  yellowish  dust ;  if  the  light 
falls  upon  it  from  behind,  narrow  black  fasciic  on  the  anterior  mar- 
gins of  the  segments  become  apparent,  which  are  invisible,  if  the 
light  falls  from  the  opposite  side.  The  delicate  pubescence  of  tho 
abdomen  is  whitish  ;  ujwn  the  upper  side  of  the  two  first  segments, 
on  the  lateral  margin  and  on  the  venter  very  long,  otherwise 
short ;  black  bristles  of  moderate  length  are  only  to  be  found 
before  tlie  hind  margin  of  the  third  and  of  the  following  segments, 
llypopygium  blacki.sh-greeu  with  white  dust;  the  externa!  ap- 
pendages st}'  liform,  but  little  shorter  than  the  inner  ones,  their 
basal  half  light-brownish  and  hairy,  their  apical  half  white  and 
glabrous,  their  extreme  tip  black ;  the  inner  appendages  form  a 
brownish-black  forceps.  Fore  coxie  yellowish  with  a  yellowish- 
white  pubescence,  which  has  on  their  outside  a  rather  unusual 
length ;  there  are  no  bristles  upon  it.     Middle  and  hind  coxte 


m 


PSILOIMS. 


2H7 


bliu'kisli.  Ft't't  j-('ll(nv,  very  luiijr  iiiid  Ix'sct  with  Ijiit  cxct'idiiifrly 
xlmrt,  ior  tlu;  greatL'st  jmrt  luiiiutu  lijilit-ooNtred  liuirs.  All  IViiiuni 
slender;  the  foremost  ones  tuperinj^  towards  the  end,  llie  niidillo 
ones  from  (ho  l)asis  as  far  as  the  first  third,  lilaek  ;  fore  femora 
npoii  the  lirst  lialf  of  the  under  side  with  six  perpendienlar,  ereet, 
lon<r,  yellow,  si)ine-likc  l)ristles  ;  hind  femora  upon  the  lirst  third 
of  the  hind  side  frinj^ed  with  hni^,  1)ut  very  delicate  whitish  hairs. 
All  tihiiu  very  long  and  slender,  fore  and  middle  tihiic  without  bris- 
tles; the  latter,  excepting  the  basis,  are  rather  dark-l)rown,  very 
elongated,  and  grailually  tapering  towards  their  end.  Hind  tiliiic 
with  rather  numerous,  very  short  black  bristles  upon  the  uniier 
side.  Fore  tarsi  brown,  very  slender,  over  once  and  two-thirds 
the  length  of  the  tibiic  ;  their  lirst  joint  is  distinctly  longer  than 
the  tii)ia  ;  the  following  joints  are  of  a  decreasing  length,  and  the 
last  one  somewhat  llattencd.  Middle  tarsi  much  longer  than  the 
fore  tarsi,  but  not  (piite  as  long  as  the  middi'  tibia',  liliform  ;  the 
first  joint  brownish-black,  about  twice  and  a  iialf  the  length  of  the 
following  taken  together,  with  hairs  of  such  shortness  that  it  ap- 
pears entirely  bare  unless  very  closely  examined;  the  four  follow- 
ing joints  light-brownish,  still  tli((  extreme  tip  of  the  second  and 
of  the  alir.<)st  ecpially  long  third  joints  brownish-black;  the  two 
last  joint;i  are  again  of  rather  eipial  length,  but,  taken  together, 
arc  only  about  us  long  as  the  scc()iid  joint ;  the  second  and  third 
joints  with  n  distinct  black  ])ubescence,  the  fourth  joint  with  a  .still 
longer  pubj^ci'iiee ;  the  small  ungues  are  sharp  and  the  pulvilli 
very  short.  ]Iind  tarsi  brownish-black  with  yellowish  basis,  not 
(piite  as  long  as  the  tibiie ;  their  lirst  joint  somewhat  longer  than 
the  four  following  taken  together;  the  joints  from  the  seconil  to 
the  fourth  of  rai)idly  decreasing  length  ;  the  fifth  joint  about  as 
long  as  the  fourth.  Ilalteres  pale-yellowish  ;  tegula)  with  whitish 
cilia.  Wings  very  long  and  narrow,  with  brown  veins ;  the  third 
longitudinal  vein  is  only  siightly  turned  backwards  near  its  end  ; 
the  anterior  branch  has  its  origin  in  the  middh^  between  the  hind 
transverse  rein  and  the  margin  ;  it  diverges  from  this  vein  at  an 
obtuse  angle  and  turns  in  a  very  flat  curve  towards  the  margin, 
which  it  reaches  so!newhat  before  the  extreme  apex  and  not  far 
from  the  tip  of  the  third  longitudinal  vein  ;  the  hind  transverse 
vein  is  unusually  distant  from  the  margin,  has  a  rather  ubli(pie 
position  and  is  not  distinctly  inflecte(l. 
Hub.  Middle  States.     (Osten-Saoken.) 


a,' 

t.y.  ■ 


A,' 

* .    ■  V 


3B<?  '■  * 

■*■■-■; 

.,■•■• 

■■■'■  i; 

1  ■ 

i-I 


I 


I 


I  1 


ATPEXDIX 


SI'ECIES  DESCRIBED  B\   .'KEVIors  ArTIIOUS  .\XD  NOT  CONTAINED  IN  THK 

PUESENT  MONOGRAPHS. 


Fabricius,  Systcma  Entomolorjise. 

Page  783.    IVIiisca  longicomis. 

Antcnnis  setariis,  pilosis,  oeiieo-nitcus,  pedibus  nigris. 

Hah.  Amoriea. 

Parva,  statura  M.  aiigulata".*  Antenna!  nigra},  pilosa?  sotaque 
unica  longitndine  fore  corporis.  Corpus  viridi  aniouiu,  nitiduni, 
pedibus  solis  nigris.     Ala;  liyaliuaj.     Cauda  unciuata. 

Fabricius,  Enlomologia  Systematica,  Vol.  IV. 
Page  341.    Musca  loiigicoriii$i. 

Antennis  setariis  elongatis  pilosa  ajneo-uiteus,  abdomiue  ob- 
scuriore. 

Ilab.  America)  insulis. 

Statura  parva  M.  ungulate.  Antenna?  clongata;  nigra?,  pilosa; 
sctaque  unica  longitudine  fere  corporis.  Corpus  viridi  a;neuni, 
uitiduin,  pedibus  solis  nigris.     Cauda  uncinata. 


W 


m 


Ml:!  h; 


Say,  Journ.  Acad.  Nat.  Sv.  Philad.   Vol.  IIL 
Page  85.    Dolicliopus  iinifasciatiis. 

Bluish-greeu ;  a  white  band  at  the  base  of  the  abdomen. 

Hah.  Pennsylvania. 

Body  bluish-green,  polished,  slender ;  antenna?,  palpi  and  pro- 


Misprint  for  niKjulatx. 


19 


(  2«9  ) 


w^ 


••  ;4 


?.5  -1 


I 


200 


DIPTKRA  OF  NCillTIf  AMKUICA. 


1.1'AHT  ir. 


boscis'wliitish  ;  snitclliiin  l)Iuc  ;  wind's  iiiiimunilato  ;  fi-ot  whitish; 
l('i';;iiiii,  first  so^jfiut'iit  iiiiil  liiilf  of  tho  sccoiul  whitish,  jmsifrior 
liiilf  of  tiio  socoiiil  scjfiiK'iit  1111(1  tiiird  sogmoiit  iiiiifh  tinged  witli 
blue,  rcinaiiiiiig  segiiiciits  green. 

Lenglii — one-fourtii  of  an  inch. 

Central  nervuro  of  the  wing  furcate,  tlio  exterior  branch  widely 
nngnlated  and  lorniinating  near  the  tip  of  the  pre  ;eding  nurvure, 
which  is  curved  very  considerably  Inwards,  towan'.s  its  tip. 

Tago  85.    Doliclio|iiis  obsciirins. 

Blaekisli-ljrassy  ;  wings  dusky  ;  feet  pale 

Hal).  J'ennsylvaina. 

Head  dark  silvery ;  antennse  black-brown  ;  mouth  blackish  ; 
thora.x  and  scuteliuiu  dark-brassy;  wings  dusky ;  feet  white,  a  lit- 
tle dusky  on  the  tarsi ;  poisers  white  ;  terguin  rather  darker  than 
the  thora.x. 

Length — less  than  three-twentieths  of  an  inch. 

The  central  nervure  of  the  wing  is  nearly  rectilinear,  being 
hardly  perceptibly  reflected. 


M  "I" 


1 

'     I' 

1 

'k 

■It 

,!■  ■      m^ 


MK,    xi 


Page  8G.    Dolicliopus  fenioratus. 

Green  ;  tibia;  and  tarsi  whitish. 

Hah.  reiiiisylvaiua. 

Body  brilliant  green,  with  bluish  reflections;  front  prninose ; 
antenna'  ))lackish  ;  proboscis  yellowish  ;  wings  hyaline  ;  scutelluin 
blue ;  thighs  green  and  excepting  the  posterior  ones,  whitish  at 
tip,  tibite  white,  tarsi  dusky;  tcrgum,  ultimate  joints  cupreous  at 
their  bases. 

Tjcngtli — three-twentieths  of  an  inch. 

The  l)rillinii('y  and  shade  of  green  in  this  insect  are  similar  to 
7>.  sipho;  when  living,  and  in  the  sun's  rays,  it  resembles  bur- 
nished gold,  nervurcs  nearly  as  in  sipho. 

Say,  Journ.  Acad.  Nat.  Sc.  Phllad.  Vol.  VI. 
Page  168.    Psilopiis  feiuoratus. 

This  brilliant  species  varies  in  the  color  of  its  thighs,  which  in 
my  description  are  stated  to  be  green  ;  a  specimen  taken  in  Indiana 
has  whitish  thighs. 


^ 


Al'I'KNPIX. 


201 


Pr.ge  1()8.    (liryNotiiH  niiliiliiH. 

lllnckisli  ;  feet  dull  Iioiicv-vcIIkw. 

yA//A    liidiaiiii. 

IJudy  ItliirUisli ;  lu-ad  didl  ]»limil)('ons ;  tliornx  ciiicrcniin,  witli 
tlircf  liriiwii  lilies  ;  wiiijii's  iimiiacidatf  ;  jioiscrs  wliitc  ;  Ifot  dark 
limicy-yiliow ;  tlnjriis  Itliick  at  i»aso  an<l  aliovc. 

Leiijrtli — rather  over  one-tenth  of  an  inch. 

rni;u  1IJ8.    4'lir}'Hotus  coiiciiiiini'iiiH. 

Cireru-l)i'assy  ;  terjriini  blue  towards  tlic  tip. 

Ihilt.   Mexico. 

lleuil  \iolaceons,  with  a  cinereo\i«;  reflection  ;  jtalpi  with  a  cine- 
reous rellertion  ;  aiiteniuu  black  ;  thorax  green  with  u  ]x\'v\  oliva- 
ceous rellection  ;  wind's  hyaline,  obs(tletely  tiiijfcd  with  yellowish 
on  the  (Mtstal  nnirain  ;  poisers  white  ;  terguin  with  a  fi'vay  rellec- 
tion, brassy-jrreen  at  base,  and  violaceous  toward.s  the  .ip;  thijrhs 
green  ;  tiltiic  whitish. 

Length — one-fourth  of  an  inch. 

Page  liin.    Clirysotiis  abdomiiialis. 

(ireen,  polished;  feet  white. 

Iliih.   Indiana. 

]>ody  briirlit  <rreen,  brilliant ;  liypostonio  purple  ;  antei.nic  yel- 
low, thorax  iniinaculate  ;  ])f»isers  yelUnv ;  terfruin,  first  scfrinent  at 
base  with  an  olisolete  yellowish  lino;  feet  white;  venter  'vhile,  at 
tip  blackish  pu'-ple. 

Length — J*  one-tenth  of  an  inch. 

Page  100.    IITedeteriis  lateralis. 

Torjrum  pale,  with  a  lateral  series  of  polished  spots. 

lliil).  Lidiana. 

Head  silvery;  proboscis  ct  antcnnie  yellowish,  seta  of  the  latter 
with  the  first  joint  very  short ;  eyes  (when  recent)  green  polished, 
vith  a  cupreous  reflection  ;  thorax  green,  somewhat  )»ruiiiose, 
with  a  dorsal  rather  compound  vitta  ;  wings  hyaline ;  jioisera 
whitish  ;  tergum  dull  yellowish,  with  a  series  of  brassy  sjiols  on 
each  side,  posterior  two  largest ;  feet  and  venter  whitish. 

Length — nearly  three-twentieths  of  an  inch. 

The  dorsal  vitta  is  impressed  behind. 


3 


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w 

w 


ft 


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k 

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pi; 

W^'  ' ' ' 

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t'!  '■'  !  \ 


WWf 


2'J2 


DIITKII.V  (»K  NOIITII  AMKUICA. 


[I'AUT  H. 


Pa^u  17i>.     ItltMleteriiH  iiiiiictiiu'iiiiiH. 

Thorax  vuricffutctl ;  wiii^s  with  hruwii  spots. 

Jldh.    Mexico. 

'riionix  olivo-browii,  triliiicatc  ;  miiMh'  line  Kicnilcr,  <lull  yel- 
lowish, obsolotcly  zigzuf^  ;  outer  lilies  eiiiereoiis  with  hiack  points; 
soiitel  brown,  cinereous  in  the  middio;  winji's  hyaline,  with  iniiny 
irren^ylar  fuscous  s|»ots,  ha/dly  to  Ix;  traced  into  four  imnd^ ; 
l)oisers  yellow  ;  tern'iini  cupreous,  ]»osterior  nuir<;ins  of  the  sej^- 
mcnts  bliickish  ;  feet  white  ;  tarsi  l)lackish. 

Length — nearly  oiie-lifth  of  an  inch. 

Pngo  171).     Dulicliopiis  abdoiuiiiulis. 

(Jreen,  ulnloinen  rufous. 
J/<th.   Indiana. 

Head  silvery;    antennic,   first  and  socoiid  joints  hlack,   third 
;  thorax  polisiied  g'reen  ;  wiiijrs  hyaline  ;  ahdonK'n,  excepting,' 


the  terminal  joint,  rufous ;    halteres  white  ;    pleuriu  and   pectus 
blackish,  pruiiiose  ;  feet  white  ;  tarsi  dusky. 
Leiiifth — less  than  three-twentieths  of  an  inch. 


J 


ji. 


I  >  .<.' 


Wiedemann,  AufsereuropaiftcJu^  Za'oiijli'ujUin',  Fnacclcn,   Vol.  II. 
Page  210.     Xo.  1*1.    l*silo|)ilH  lliucillu. 

Yiridaureus  ;  autenuis  nij,'ris,  pedibus  llavis  ;  alls  niaculA  iua<iiii\ 
fiiScA. 

Clriingolden,  mit  schwarzen  Fiihlcrn,  gelben  Ik'inea  und  eineni 
frrosseii  scliwiirzlich-brauiien   Fliigelllecke. 

Liingo  ;}  Linieii  9.     Von  der  Krabbeninsel  in  W'estindien 

Untergesicht  an  den  Fiihlerii  schon  Htahll)!au,  Aveiter  u'lteii 
griingolden,  iiberall  aber  in  gewisser  Kichtung  fast  silberweiss 
schininiernd.  Stirn  griingoldeii,  in's  Stuhlijlaiit'  fallend.  Iliicken- 
schild  obenso,  ganz  vorn  wenig  wciss-schinnnernd.  IJrustseiteii 
cbenso,  docli  iilteral!  stark  weiss-scliinunernd.  Ilinterleib  griin- 
goldeii, an  den  Kinsclinitteu  schwarz,  in  gewisser  lliclituiig  audi 
wold  kiij)ferrotlilicli.  JJeiiie  gelb  ;  liinterste  Schiencn  und  Fiisso 
allniiililig  braun.  Fliigel  wasserklar ;  der  Fleck  liegt  liings  dor 
llippe  und  niinint  von  ilir  sell)st  bis  Zwei  drittel  dor  Fliigolbroito 
eiii,  or  liogt  von  Wurzel  und  8})itzo  gleicliweit  entferiit,  niniiut 
etwa  die  Zwei  luittlerii  Viortol  dor  Fliigel  ein,  und  hat  einen  ge- 


T^ 


AI'IT.MUX. 


2t»3 


riiiKlctf'ii    Iiinoiiranil.      (In    II(triil)iTk's   jSainiiilmi}^   /ii   KoiJi-ii- 

liiiii'i'ii.) 

{Tiiiiisl'iiiiiii.) — f!i)M(>n  prct'ii,  with  Mmk  niitt'iiiKi',  yi-Uow  fi-ct  ainl  a 
lnri.'f  liii(\\*iiislil.ln<'k  !<|Mit  on  tin-  wind's  ;  li'iii,'tli  tlirt-ii  lines,  ^.  From  tim 
('nil.  I.<laii.ls  (W.'.-t  Imli.'O- 

I'acn  lirif^lit  st»'i'l-l)liM  near  tin'  aiili'nn.'P,  ^'olll^•n-gr^>t'Il  fartliiT  lu'liuv, 
t'Vciywlicii'  witii  !i  silvery  renectinii  in  a  certiiiii  liglit.  Front  golden- 
j;reen,  with  .1  Miiisli  rellection  ;  thorax  likewise,  Imt  with  a  silvery  rellei'. 
tion  anteriorly  ;  iil.'nr.e  ot'  the  same  eolor,  altok'ether  with  a  whitish  rellec- 
tion.  AlMlomiMi  gohlen  i^reen,  hlacU  at  tho  iniisnres,  in  a  eertai'.i  li^'iit 
rt'ilili^tli-c'opiiery.  Ffft  yellow  ;  himl  tiliiai  anil  I'eet  gradually  infuseateil. 
Winu's  hy.'iline;  the  ilark  spot  i.i  alon^  the  costa  .'iinl  estends  to  ahout  two- 
tiiirds  of  the  hre.adth  of  the  winj.';  it  i.-t  eipially  distant  from  the  liase  and 
the  tip,  and  occupies  nlioiit  two-fourths  of  the  length  of  tlie  winu'  in  the 
niiddlf;  its  inner  border  is  rounded.  (Ilornbeuk'u  Collection  in  Copen- 
liagi-n.) 

Page  21',).     !Vo.  i:i.    rHilopilH  Majl. 

J'liit'iis  ;  [iiitoiiliis,  iihdnniiiiis  \m<\,  im-isiifis  pi'diliiisciiic  (luvis. 

Kiv.o-riiii,  mit  ot11»cii  Fiililcrii,  Iliiit('rlcil)s\viirzt'l.  J'iiiisclniittcu 
uiid  l)iiin'ii.      lisiiijii'  iij  liiiiit'ii  %.     Alls  I'cniisylviinicii. 

J>iilirhiij)ii.<  Kiiil'dKciiitiix  Siiy,  .fMiini.  Aciid.  I'liilml.  Ill,  s."(,  -J, 

I'lililcrwiirzci,  alter  iiiirh  wnlirsclicinlicli  das  vfrltireii  frt'^^aiifrcno 
Eiidu'licd,  ^rdli.  Viitcrirt'siclit  lidilinft  civ.oTliii,  iintcii  wciiiji:  wciss- 
.^(•liiiiimi'nid  ;  Stini  sinaniirdjri'iiii,  iiiit  -Mclallo'Iaiiz.  Uiickcnsrliihl 
in'.s  (Jriiiij!;iild('ii(.'  iilicrj^t'lii'iid  ;  die  jrriiii)-''<tldeiieii  lirtistseiieii  weiss 
befeil'l.  Krster  Jliiiterleiltsaltselmitt  iilterall,  zweiter  an  der 
Wiirzel,  f()l<rende  an  den  Kiiiseliiiitten  prjlb ;  die  IIiiii|ttfiirlte  des 
Hiiiterleibes  ist  nn  der  Wiirzel  sinarafrdfrri'mlieli  erzCarlien,  was  an 
der  Siiitze  ins  (iriin,ir<ildene  iiltei-o'eht.  Fiiiirtd  selir  lielit  <re|ltlicli, 
iiiit  jrellien 'Adern.  Heine  jrel't;  Vdrdersto  Fiisse  iihei'iili,  liintefe 
iinr  an  dor  Spitze  sfli\varzlieli-l)raun.  (Ini  Pliiladeljtliiseheii 
Museum.) 

{Tratislfition.') — Bronze-green,  with  yellow  antenna*,  basia  of  the  abdo- 
men, incisures  and  feet;  length  two  and  two-thirds  of  Hues,  ^.  Penu- 
sylvania. 

Syn.    I).  un!/<isci'it:ts  Say,  .Journ.  Ac.  Phil.  Ill,  h.'),  2. 

Basis  of  antennjB  and  probably  also  the  last  joint  (which  is  broken) 
yellow.  Face  brisiht  bronze-green,  with  a  sliglit  whitish  reflection  below. 
Front  emerald-green,  with  metallic  retlection.  Thorax  verging  into  golden- 
green  ;  the  golden-green  jilenrw  whitish-prninose.  First  abdoniiml  sesr- 
xnent  yellow,  the  root  of  the  second  (ind  the  incisures  of  the  following,  also 


1 


w 

t 


Ml 


i': 


204 


DIPTERA  OF  NORTH  AMERICA. 


[taut  II. 


jcllow.  Tlie  principal  color  of  tho  alulomen  is  bronzo  eim'ral(]-grt'('iii>  h 
towards  tin;  base,  cha'itiing  into  golden-grt't'n  towarils  tlio  tip.  Wilms  vi'iy 
liglit  yt'llowisli,  with  yellow  vt'ins.  Feet  yt'ilow,  tori"  tarsi  altnirctluT 
blaukish-browu,  posterior  ones  only  at  tho  tip.    (AMust'iini  of  rhiladcljiliia.) 

Page  220.     !Vo.  II.   I'silopiis  loiiKicoriiis  Fai:u. 

.l']neiis  ;  ahdoininc  iiicisiiris  atris,  alis  liiiipidis. 

KrzfiTlin,  init  ticf  schwarzcii  lliiitorK-ihscinschiiiHiMi  uiid  was- 
scrklarcii  Fliiuolii.     Liiii<i-o  2|]  Linicii.     ^\us  Wcstiiidicii. 

IJiitcr^csicht  crzg'i'iiii,  kaum  am  untcrii  Tlioilu  in  jri'W  isscr 
KiclitiiMg  woisslirli  schiinnicnid.  Stini  erzjrriiii.  Jliicknischild 
uiid  IIiiit<'i'lt'il>  f;;riiii,tfoIdi'n,  differ  an  dcr  Wiirzcl  der  Altsdiiiitti! 
tirf  scliwarz.  Kliif^td  ungcfarht ;  Scli\viii;i'cr  jrcll).  JJciiic  scliwarz 
an  den  Hcliciikilii  last  nictallj^lanzciid  an  dcti  vurdcrsti'ii  JSt'ldciuii 
loImiL^'Ib.     (In  dcr  Fabriciiis,  schcii  Saiundiiiijr.) 

{Trausliition.) — Bronze-green;  abdoTnen  with  deep  black  incisures; 
wings  liyaliuo  ;  length,  two  and  two-thirds  of  lines.     West  Indies. 

Face  bronze-green,  with  a  slight  whitish  lustre  on  its  lower  part.  Front 
bronze-green.  Thorax  and  abdomen  golden-green  ;  the  latter  deep  black 
at  the  root  of  tlie  sc^gnients.  Wings  hyaline  ;  haltercs  yellow.  Feet 
black,  almost  with  a  metallic  lustre  ou  the  femora  ;  fore  tibiie  luteous  yel- 
low.    (Fabricius's  coUectiou.) 

Tage  224.    No.  33.    Psilopiis  caiiilatiis. 

Tliorace  junco-viridi,  abdoniiiio  viridaureo;  iucisui'is  atris,  tibiis 
fiavis. 

Mil  crz^n'iinom  liiickonscliilde  tnid  fr'.'iiiifroldtMicin,  solnvarz 
t'inoTSciinittonoui  Ilintorkdljo  und  tiTlbon  Scliieuen. 

Iiiin<>;i>  2  bis  '1\  Liiuen.      Von  Savannah. 

Dent  r.  lowiicornis  vorwandt.  Fiililcr  sdiwarz  ;  TTiitcrjrcsiclit 
orzfrriin,  silbcrwcisslioli  soiuninK'nid  ;  sUin  priin<!;<)I(l(Mi,  am  Wcib- 
dien  mclir  ab'  am  Maniu'ben.  Hiit'kenschild  dcs  ^Sliinncbcns  liin- 
U'li  in's  Stahlblai'.o  iiljcrgclicnd,  am  Woilii-hon  diu'dio:t'li('iids  j!:riin- 
froldcn.  IJrustseiten  sillxTwoisslich,  Iliidorleil)  griiiif^oldon,  niit 
an  dor  Wnrzel  ticf  schwarzon  Abscbnitten.  After  dcs  .Mannclicns 
mit  scln-  laiifron  Tlaami  l)(.-si'tzt.  Fliiscl  wassorklar ;  Schwiiificr 
pclbiicli ;  Sohcnkol  dos  Miinnclicns  orzfrriin  :  vordcrc  mit  lod('rfi;clbcr 
Spitzc,  SHiicMion  siimmtlich  ledorp:('ll>.  Fiisso  schwarz.  Am 
AV('il)rlicn  sind  audi  die  Sdienkd  gdb.  (In  Wostcnnann's  Samm- 
lung.) 


;i 


APrENDIX. 


295 


{Tidusldtion.) — Thorax  liroii/e-gioon ;  abdomen  goldon-green,  with 
liliicK  iiiuisuros  ;  tibi^u  ^'ellow  ;  k-iigth  iioiu  two  to  two  and  one-fourth 
liiu'H.      (Savannali.) 

Related  to  /'.  luni)ironiis.  Anteiin.-c  hiack.  l-'ace  bronze-green,  with  a 
silvery-wliite  rellection  ;  front  goldtsn -green,  more  so  in  the  9  than  in  tlie 
■J,.  Tiiorax  of  Jj  more  . steel-blue  ;Misteriorly  ;  of  tlie  9  'I't^'gylher  golden- 
green.  Pleuraj  Hilvery-white.  Ab(h>men  golden-green,  with  the  segments 
deep-black  at  the  basis.  Ilyi)opygium  b<^set  with  black  hair.  Wings 
liyaline  ;  halteres  ynllowish.  Femora  of  the  male  bronze-green  ;  tlui  fore- 
most with  the  tip  yellowish  ;  all  the  tibia;  leather-yellow.  Tarsi  bluek. 
The  femor     .>f  the  9  '^'•■'"  yellow.     (Westermann's  collection.) 

Page  224.     :\o.  21.    I'siloiius  Yirgo. 

TEnoo-viriilis  ;   pcdihiis  hiitc  fliivis. 

J']rz,i;;riiii,  init  scln'tii  gL-Ilu'ii  IJcineii. 

Liiiifj;'c  2  Liiiion,  9.      V(»ii  Xi-w  York. 

FiilMcr  scliwarz.  Unlcrgi'sii-ht  griiii,  mit  sill)cr\vcissom  Scliim- 
HK'i'.  .Mittelh'ilt  schuii  iTzgriin.  Ilintcrh-il)  griingoldcn.  Fliigol 
\iiig('('iirl)t,  Adorn  ))riniii ;  Spit/ciMnicriuk'r  kciiii'ti  winkcligoii 
ijogcii  bildcnd.  Schwiiigcr  uiid  l>ciiu'  loI)li!ift  gcll),  iii's  liostgclho 
lalk'nd.  lliiilorsto  Filssio  .suhwarzlicliln'iiuii.  (lu  mcinor  iSaiuin- 
luiig.) 

( Traitslalinn.) — (Jolden-greeu  with  handsomely  yellow  feet ;  length  two 
lines,   9-     (New  York.) 

Antenna)  black.  Face  green,  with  a  silv<'ry-white  reflection.  Thorax 
handsome  green.  Abdomen  golden-gretsn.  Wings  not  pictured  ;  veins 
brown  ;  ujjper  branch  of  the  fourth  lonu'itndinal  vein  not  forming  an 
angular  curve.  Halteres  and  feet  bright-yellow,  somewhat  reddish-yellow. 
Hind  tarsi  blackish-brown.     (In  my  own  collection.) 


(i.i* 


'•,,,/:'/■ 


Page  220.    l\'o.  2K.    Psilopus  fenioratiiH. 

J'iiK'o-viridis,  iuitcTinis  nigcllis  ;  pi'dil)ns  lluvis,  fcniorihiis  basi 
viroiitil)US  ;  alls  liinpidis. 

Lchhaft  orzgriin,  mit  schwarzlichiMi  FiihhMMi,  gcUxMi  Ilcincn,  aii 
dcr  Wurzol  griiidichcn  Sclicnkclii  mid  wasscrklaroii  Fliigolii. 
liiiiigc  \}r  Linifii.      A  us  I'l'iinsylvanicii. 

Aut'h  dk'se  klcinc  Art  ziclit  dcr  Farltc  nadi  stark  inV.  (iriiii- 
goldciio,  Z'uvt'ileii  an  Stirii  uiul  lliickciiscldld  in's  illiiulichc.  Vi\- 
((.]-o;,.siclit  und  IJnistscitoii  wcisscliinmicriid  odcr  bcrcii't.  Iliissol 
golblich.      Fliigel    uhne    alio    Zoichuung.      lioinc    bloicb    golb. 


f 


t^f 


p 


■i 


I 


1 

9 

1-- 

1 

'  Hi 

JHwl'' ' 

1 

"'  Jm 

1; 

Mi 

mi 

Wi  ■ 

n 

■H>. 

296 


DIPTERA  OB'  NORTH  AMERICA. 


[part  II. 


Sflienkel  griinllch,  die  vordeni  niit  gelber  Spitze.     (In  meiuer 
Sammlung.) 

{Translation.) — Brilliant  bronze-green,  with  blackish  antennre,  yellow 
feet,  femora  greenish  at  the  basis,  and  hyaline  wings.  Length  one  and 
one-half  lines.     (Pennsylvania.) 

Tlie  color  of  this  small  species  also  approaches  the  golden-green  ;  front 
and  thorax  are  sometimes  bluish.  Face  and  pleurie  have  a  \7hite  reflec- 
tion or  are  pruinose.  Proboscis  yellowish.  Wings  not  pictured.  Feet 
pale-yellow.  Femora  greenish,  the  anterior  ones  with  yellow  tip.  (In  ray 
own  collection.) 

Page  227.     No.  30.    Psilopiis  muiidus. 

Omnino  clialybeiis,  veni\  apieali  in  anguluni  obtusum  flexA. 

Uebcrall  stahlblau,  niit  stumpfwiukolig  gebogcncr  Spitzen- 
qucradcr.     Li'iiige  1^  Linicn.     Von  Savannah. 

Fiihler  schwarz ;  Untergesicht  und  Stirn  satt  stahlblau,  dcr 
iintorste  Tlieil  jenes  nur  schr  wcnig  weiss-schiinmernd.  ]\Iittel- 
und  llintcrleib  satt  stahlblau,  an  den  Seiteu  hin  undwiedor  griin- 
lich,  doch  so,  dass  ich  kaum  glaube,  dass  cs  ganz  griine  Abiinder- 
ungen  gcbe.  Fliigel  ungcfarbt.  Die  Spitzenquorader  bildet 
keincn  so  gleichforniig  gekriinnntcn  Bogcn,  wie  bei  P.  virgo, 
sondorn  macht  eincn  stunipfen  Wiiikol.  Schwinger  gelb.  Boino 
schwarz,  an  den  Schcnkeln  stahlbliiulieh.     (In  meincr  Samndung.) 

{Traimlafion.') — Altogether  steel-blue,  with  the  anterior  branch  of  the 
fourth  longitudinal  vein  angularly  curved.  Length  one  and  one-half  lines. 
(Savannah.) 

Antennae  black ;  face  and  front  saturate  steel-blue ;  the  lower  part  of 
the  former  with  only  very  little  wliite  reflection.  Tliorax  and  abdomen 
saturate  steel-blue,  in  some  places  on  the  sides  greenish,  still  so  as  to 
make  me  doubt  whether  there  are  entirely  green  varieties.  Wings  not 
pictured.  The  branch  of  the  fourth  vein  is  not  regularly  arched  as  in 
P.  vinjo,  but  forms  an  obtuse  angle.  Halteres  yellow.  Feet  black, 
femora  steel-blue.     (My  own  collection.) 

Page  232.    "Xo.  6.    Dolicliopiis  obsciirus  Sat. 

^neo  nigcllus ;  capite  niveo-micaute  ;  alls  infumatis,  pedibus 
flavis. 

Erzgriinlich-schwarz,  mil  schneeweiss  schimmerndera  Kopfe, 
rauchgraulichcn  Fliigeln  und  gelbcn  Beinen.  Liinge  1^  Linien, 
9.     Aus  Pennsylvanien. 

Fiihler  tief  schwarz ;  Untergcsicht  und  Stirn  schwarz,  bcide 


APPENDIX. 


!97 


schneeweiss  scbiminornd.  Kiickeiisdiild  aiis  doiii  Scliwarzlifhon 
ill's  Gi'iiiie  und  riUhlicIi  stalil'jhiue  sitit'lcnd ;  Ih'iistst'itcii  wciss- 
bcreift.  llinttrleib  inetallisch  schwar/licli,  iii\s  diistcr  griinliche 
zieliend.  Fliigel  satt  rauoligi'au ;  iScliwiugTr  und  IJeiiic  golb 
(Im  riiiladt'lpliisfhon  Musoum.) 

(Tiaiislatl',11.) — Blacki:<li  bronze-green  ;  head  with  a  snow-white  retlec- 
tion  ;  winirs  smoky-gray  ;  feet  yellow.  Length  one  and  cue-half  lines,  9  • 
(Pennsylvania.) 

Antenuie  deep-black;  face  and  front  black,  both  with  a  silvery-white 
reflection.  Thorax  changing  from  the  blackish  into  green  and  reddish 
steel-blue;  pleurse  pruinose  with  white.  Abdomen  nietallie  blackisli, 
with  a  dusky  greenish  reflection.  Wings  saturate  smoky-gray  ;  halterea 
and  feet  yellow.     (Museum  of  Philadelphia.) 

3Iacquart,  Diptcrcs,  Sidles  d  Buffon,  Vol.  I. 
Page  450.    No.  6.    P«ilopiis  radians. 

Long  2i  lig.  D'un  vert  ou  d'liii  bleu  violet,  tres  l)rillant. 
Antennes  noires  ;  aeuxienio  article  garni  de  soies  allongees,  ravon- 
naut  a  rentour  ;  style  furt  nllunge.  IJord  des  segniens  de  I'abdo- 
men  noir ;  organe  copvdatour  pen  cpais.  Pieds  noirs ;  janibes 
anterieures  et  intermediaires  jaunitres.  Bord  exterieur  des  ailes 
un  peu  brundtre  vers  rextreniite.  De  I'Aiueriquo  septeutrionalc. 
(Cabinet  de  M.  Percheron.) 

{Translation.) — Length  two  and  one-half  lines.  Purplish-green  or  blue, 
very  brilliant.  Antenna  black ;  second  joint  fringed  with  elongated, 
radiating  bristles ;  arista  very  long.  Borders  of  abdominal  segments 
black;  genital  organs  not  very  stout.  Feet  black;  fore  and  middle  tibite 
yellowish.  Anterior  margin  of  the  wing  somewhat  brownish  towards  the 
tip.     North  America.     (Mr.  Percheron's  collection.) 


' 

i,   ' 

»  ■ 

,"r-  ■ 

,      i 

t 

!  ■":   ■ 

31acqvart,  Diptcrcs  cj-ofiqucn,  Vol.  IT. 

Page  lit).     No.  11.    Psilopus  siplio, 

Lfete  JBneus.  Alis  abl)reviato-bifas('iatis.  Antennis  nigris. 
Pedibus  flavis ;  fenioribns  nigris  J*;  tibiis  postieis  nigris  ^ 
(Tab.  21,  fig.  1.)  Wieckmann  a  decrit  eette  espeee  ooniine  ayant 
les  pieds  jaunes  dan?  )es  deux  sexes.  Suivant  nos  ol)servati()ns 
sur  un  assez  grand  nombi'e  d'individus,  les  fenielles  senles  out  les 
pieds  de  cettc  coulenr,  a  rexeoption  des  tnrses  noirs ;  les  males 
ont  les  cuisses  noires,  ainsi  que  les  jambcs  posterieures. 


r 

-■    i 
t 

■  •'   si' 
■■1 

■■Hi 


298 


DII'TKRA  OF  XOIITII  AMKIUCA. 


[I'AUT  IT. 


Cc'tto  ospc'jcc  est  ('1)11111111110  ot  iviiaiidiK.'  duns  line  {iTunde  iiartio 
de  TAiii;  ri(|iie.  Nous  en  iivuns  vu  dcs  individiis  do  la  I'eiisyl- 
vanie,  du  Cuba,  do  la  (.iuyaiie  et  dos  diilrreiites  parties  du  l>rcsil. 

(_Tntiisliilion.) — Bright  hionze-grcen.  Wings  with  two  al)l)n>viateil 
fascia'.  Antoniia)  black,  l-'ect  yellow.  Femora  lilack('^);  liiiid  tihim 
black  ( I  ).     (Tab.  XXI,  fig.  1.) 

Wiedeiiianu  described  this  species  as  having  yellow  feet  in  both  sexes. 
According  to  iny  observations  on  a  considerable  number  of  specimens,  the 
females  alone  have;  the  feet  of  this  color,  with  the  exception  of  the  black 
tarsi  ;   the  males  have  black  femora  and  hind  tibiic. 

This  species  is  common  in  a  consideralile  j)art  of  America.  We  have 
specimens  from  Pennsylvania,  Cuba,  Guyana,  and  from  dill'erent  parts  of 
Brazil. 

Page  121.     ]Vo.  IS.    Psilopiis  radians. 

liietc-iencus.  Antennarum  artlcido  secundo  setis  clungalis 
radiati.s ;  stylo  longissinio. 

L<)n,ir.  2n.  ^. 

D'lm  vert  on  (run  lilou  violet  tW'S  brilliant.  Antcnnes  noires; 
dcuxif'inc  article  g-ariii  de  soies  allong-oes,  rayoniiant  a  Tentour ; 
style  fort  allonge.  IJord  des  seg-ineiits  de  Tabdonien  noirs  ;  orgaiic 
copulateiir  peu  (>pais.  Pieds  noirs,  janibes  postih'ieurs  ct  iiiler- 
niediaires  jaunatres.  Bord  ext(?rieur  des  ailes  un  peu  bruni\tre 
vers  re.YtrcMuiti}. 

De  rAiuericpie  scptentrionalc.  (Cabinet  do  M.  Pcrclieron  a 
Paris.) 

{Trauxlaliou.) — Bright  bronze-green.  Second  joint  of  the  antennaj  with 
elongated,  radiating  bristles  ;  arista  very  long.  Length  two  and  one-half 
lines,  %. 

Purplish-green  or  blue,  very  brilliant.  Antennse  black.  Second  joint 
fringed  with  elongated,  radiating  bristles.  Style  very  long.  Margin  of 
the  abdominal  segments  black.  Ilypopygium  not  stout ;  feet  black ; 
intermediate  and  hind  tibia)  yellowish.  Anterior  margin  of  the  wings 
somewhat  brownish  towards  the  tip. 

Is'ortli  America.     (Collection  of  M.  Percheron  in  Paris.) 

Macquart,  Diptcrra  exoliques,  Siippl.  IV. 

Page  124.    No.  3.    Clirysotiis  Tiridifeinora. 

Viridi   aureus.      Antonnis   nigris.      Podibiis  rufis,   femoribus 
viridibus.     (Tab.  12.  lig.  3.) 
Long,  uiio  1.  9. 


i< ..'{ 


APPENDIX. 


299 


Face  et  front  verts,  u  .luvct  blunc.     Anteiines  ct  style  iioirs 
Thorax  ot  abiloinoii  d'uu  vert  (Ion;.     Cuis.ses  (run  vert  brilhint,  a 
jvenoux    jivunes ;    jiunbes  fuuves ;    tarses    d'un  juune    brunitre; 
posterienr'  bruns,  ;i  premier  artiele  jaune.     Ailes  elaires, 

I)e  rAineri([ue  septenlrionale.  (Colleetiou  ties  M.  Jloll'nuister 
lie  Nordhausen.) 

(Traiisfatliin.) — OoMen-green.  Antennre  Mack.  Feet  rufous,  femora 
green.     (Tab.  XIl,  fig.  3.)     Length  one  lino,  9. 

Face  and  front  green,  witli  wliite  down.  Antennjc  and  arista  black. 
Thorax  and  abdomen  golden-green.  Femora  brilliant-green  ;  km-es  yellow  ; 
tibia)  fulvous  ;  tarsi  brownish-yellow  ;  the  hind  ones  brown,  with  the  iirst 
joint  yellow.     Wings  hyaline. 

North  America.     (Collection  of  Mr.  Hoffmeister  in  Nordhausen.) 

Page  128.    No.  5.   Dolicliopus  lieteroueurus. 

vEneo-virlilis.  Tlioraee  vittis  violaeeis.  Pe(lil)us  ilavis.  Alis 
cellula  postiei  prinii  subelausi.     (Tab.  12,  fig.  10.) 

Long.  1^  1. 

Palpes  noirs.  Face  et  front  larges,  d'un  vert  noinVtres,  a  It'ger 
duvet  gris.  Antennes  :  les  deux  premiers  articles  fauves  ;  premier 
un  pen  allongi';  et  menu ;  troisiunie  ovale,  assez  large,  iioir,  a  Ijase 
fauve  ;  style  noir,  i)eu  allongt-.  Thorax  d'un  vert  funcc,  a  Ijandes 
violettes.  Abdomen  vert ;  ventre  a  duvet  blane.  Pieds  jannes, 
handles  anterieures  noinUres ;  un  pen  de  brun  a  rextremito  de.s 
cuisses  ;  tarses  bruns.  Ailes  assez  elaires  ;  premii/re  cellule  |)ostc- 
rieiire  presque  fermee  ;  deuxiemc  ucrvure  transversale  eluignee 
du  coude. 

De  rAnierique  septentrionale.  (Collection  de  M.  Hoflnieister 
de  Xordhiiusen.) 

(Translation.) — Golden-green.  Tliorax  with  violet  stripes  ;  feet  yellow. 
Wings  with  the  first  posterior  cell  almost  closed.  (Tab.  12,  fig.  10.) 
Long.  lin.  one  and  one-half. 

Palpi  black.  Face  and  front  broad,  blackish-green,  with  a  slight  gray 
down.  Antennte  ;  two  first  joints  fulvous  :  the  first  somewhat  prolonged 
and  slender;  the  third  oval,  rather  broad,  black,  with  fulvous  basis; 
arista  black,  not  very  loner.  Thorax  dark-green,  with  violet  stripes. 
Abdomen  green,  venter  with  whitish  down.  Feet  yellow,  anterior  coxa 
blackish  ;  tip  of  femora  somewhat  infuscated  ;  tarsi  brown.  Wings  rather 
hyaline  ;  first  posterior  cell  almost  closed  ;  second  transverse  vein  at  some 
distance  from  the  flexure  of  the  fourth  vein. 

Ilab,  North  America. 


->w ' 


800 


DIPTERA  OF  XOUTII  AMKUICA. 


[I'AUT  II. 


■ii 


Wal/>cr,  Iiiscda  Saioulrrsiana. 
Page  207.     PAilopus  Icpidlls  Mas. 

Tiridis,  alKlominis  soginentunim  nmrgiiiilxis  anticis  nijrris, 
antfiiiiis  pc'(lilni,s(iiic  iiigris,  alls  liiupidis  fusco-hilhsciatis. 

JJi-iglit-grt'L'ii,  beset  with  bhick  bristles;  li.jad  Idue,  tiii<j;ed  with 
purjile,  adorned  in  iVoiit  with  white  bloom  ;  eye.s  bright-red  ; 
mouth  bhu'k  ;  feelers  blaek ;  sixth  joint  as  long  as  the  ehest  ; 
chest  not  shining,  tinged  with  blue  ;  breast  with  a  iioary  covering; 
abdomen  tapering  from  the  base  to  the  tip,  narrower  and  nincli 
longer  than  the  chest ;  a  black  band  on  the  fore  border  of  each 
segment ;  legs  black,  clothed  with  black  hairs  and  bristles;  wings 
colorless,  adorned  with  two  dark-brown  bands  which  are  united 
on  the  fore  border ;  tip  cross-vein  forming  a  right  angle,  wliencc 
it  is  indistinctly  waving  to  the  tip  of  the  wing;  lower  cross-vein 
very  slightly  waving;  wing-ribs  and  veins  black.  Length  of  the 
body  two  and  one-half  lines  ;  of  the  wings  six  lines. 

3Iexico. 


Page  211.    9Iedeteriis  exustus  Fem. 

Nigro-ffineus,  capite  antico  viridi ;  abdominc  purpurco  cuproo, 
antcnnis  pedibuscpie  nigris,  femoribus  asneis,  alis  cincreis,  costii 
venarunKjuc  marginibus  fuscis. 

Allied  to  31.  notutus.  Bronze-black,  beset  with  black  bristles, 
which  form  a  cross-row  behind  the  head,  adorned  beneath  with  a 
whitish  covering ;  head  green  in  front,  clothed  beneath  with  black 
hairs ;  peristoma  prominent ;  eyes  red  ;  facets  of  the  fore  part 
rather  large  ;  feelers  black  ;  abdomen  ol)conical,  coppery  with  a 
slight  purplish  tinge,  not  longer  than  the  chest ;  legs  long,  black, 
thickly  clothed  with  black  down,  beset  with  a  few  black  bristles ; 
thighs  brassy,  armed  with  black  spines;  foot-cushions  dark-tawny; 
wings  darkish-gray,  very  dark-brown  beneath  the  fore  border  and 
along  the  borders  of  the  veins  in  the  disk  ;  wing-ribs  and  veins 
black ;  poisers  dark-tawny  with  pitchy  knobs.  Length  of  the 
body  two  and  one-half  lines  ;  of  the  wings  six  Hues. 

Bolton,  North  America. 


APPENDIX. 


301 


Page  212.    Medeterus  viridiflos  Feu. 

Fulvo-vlridis,  thoracis  disco  fusco,  autcnnis  pcdibiisciuo  uigris, 
fumorilMis  viridibus,  alis  subcinorcis  ad  costaia  sulifiiscis. 

Pale  grassy-grcon,  tinged  with  tawny  above  and  witli  whitish 
bloom  beneath,  beset  with  a  few  black  bristles;  head  brown  about 
the  eyelets,  beset  behind  the  eyes  with  a  row  of  black  bristles, 
clothed  l)eneath  with  white  hairs;  eyes  red,  thickly  clothed  with 
short,  white  hairs  ;  feelers  black ;  disk  of  the  chest  brownish  ; 
abdomen  obconical,  longer  than  the  chest,  clothed  with  very  short 
white  hairs ;  legs  black,  clothed  with  very  short  black  hairs,  beset 
with  black  bristles ;  thighs  green,  with  which  color  the  shanks  arc 
also  tinged;  wings  slightly  gray,  tinged  with  pale-brown  beneath 
the  fore  l)order  ;  wing-ril)s  and  i)oisers  tawny  ;  veins  black,  tawny 
at  the  base.  Length  of  the  body  one  and  one-half  lines ;  of  the 
wings  four  and  one-half  Hues. 

North  America. 


I'W. 


k\l¥: 


'■::t 


Page  212.    Dolicliopiis  bif  rons  Fem. 

JlJneo-viridis,  capitis  vertice  cyaneo,  abdominis  segmcntorum 
larginibus  anticis  cupreis,  antennis  fulvis,  pedibus  flavis,  alls 
sidjcinereis. 

Green,  beset  with  black  bristles,  adorned  beneath  with  a  white 
covering;  crown  of  the  head  blue,  tinged  with  green  and  purple; 
an  olive  stripe  between  the  feelers  and  the  epistoma  ;  eyes  red ; 
mouth  pitchy.  Feelers  tawny  ;  third  joint  pitchy  towards  the  til) ; 
sixth  black,  feathered ;  a  brassy  tinge  on  the  chest ;  alKlonien 
obconical,  longer  than  the  chest,  coppery  on  the  fore  border  of 
each  segment  whose  sides  are  adorned  with  a  white  covering; 
legs  yellow,  clothed  witli  very  short  black  hairs,  which  as  usual 
are  most  frecjuent  on  the  feet ;  thighs  stout,  shanks  beset  with 
black  bristles  ;  wings  very  slightly  gray  ;  wing-ribs  tawny  ;  veins 
black,  tawny  at  the  base,  poisers  yellow.  Length  of  the  body 
one  and  one-half  to  one  and  three-fourth  lines ;  of  the  wings 
three  and  one-half  to  four  lines. 

United  States. 


-*'^ 


i'l 

.'V 

I, 

k 

R  ill  i 


302 


DIVTEllA  OF  NORTH  AMERICA. 


[I'ART  II. 


Page  213.    DolicliopiiH  conHors  Feh. 

yEncn-viridis,  vertico  ixirpiiroo,  tlioraco  aiiticu  rymioo,  ubilomini.s 
sntiiris  iiifi;ris,  luitL'iiiiis  iK'iliIjii.s(iiiL'  I'lilvis,  alls  siiltciiKTcis. 

(Jri'cii,  bosot  willi  bhiok  bristles,  adorned  bonoutli  witli  a  whiti.-h 
covcriiiir ;  crown  piirplo ;  eyes  black ;  mouth  tawny ;  feelers 
tawny  ;  sixth  joint  black,  feathered  with  much  shorter  hairs  than 
those  of  7>.  bij'rons;  chest  brassy-j^recn,  blue  in  front  ;  abdomen 
obcoiucal,  clothed  with  short,  black  hairs,  a  little  lonfrer  than  the 
chest,  sutures  of  the  segnients  blackish  ;  legs  tawny,  c''»thed  with 
very  short  black  hairs;  shanks  beset  with  black  bristles;  wings 
grayish  ;  wing-ril)s  tawny  ;  veins  black,  tawny  at  the  base ;  poisers 
tawny  with  yellow  knobs.  L'cngth  of  the  body  one  and  one- 
fourth  line  ;  of  the  wings  three  lines. 

United  States. 

Page  213.    Dolicliopiis  contingens  F^m. 

Yiridis,  vertico  purpureo,  antennis  pedibusquc  fulvis,  alls 
suljcinereis. 

Green,  beset  with  black  bristles,  adorned  beneath  with  a  whitish 
covering ;  crown  purple  ;  eyes  black ;  mouth  tawny  ;  feelers 
tawny,  sixth  joint  black,  feathered  like  that  of/),  consurs ;  abdo- 
men obconical,  clothed  with  short  black  hairs,  a  little  longer  than 
the  chest ;  legs  tawny,  clothed  with  very  short  black  hairs ; 
shanks  l)esctwitli  black  bristles;  wings  grayish  ;  wing-ribs  tawny; 
veins  black,  tawny  at  the  base  ;  tip  cross-vein  less  angular  than 
that  of  I).  couHors ;  poisers  dark-tawny.  Length  of  the  body  one 
and  one-fourth  line  ;  of  the  wings  three  lines. 

United  States. 

Page  213.    Dolicliopiis  Iielies  Fem. 

JEnens,  vcrticc  cyanco,  abdominis  segmentorum  raarginibus 
posticis  viridibus,  antennis  pedibusque  fulvis,  alls  cinereis  costa 
venarumque  marginibus  fuscis. 

Brassy,  beset  with  black  bristles,  adorned  beneath  with  a 
whitish  covering ;  crown  of  the  head  blue ;  eyes  red ;  feelers 
tawny,  sixth  joint  l»lack,  feathered  with  very  short  hairs;  alnlo- 
men  obconical,  longer  than  the  chest ;  hind  borders  of  the  seg- 
ments green  ;   legs  dark-tawny,  clothed  with  very  short  black 


AI'PKNDrX. 


303 


liiiirs ;    shanks  beset   witli   black   bristles;     wiiifj^s    gray,   b^()\v^ 
beneath  the  lore  border,  and  alonj,'  the  iionlers  of  tlie  veins;  wing. 
ril)s  and  veins  blaek  ;  poisers  tawny  with  pitchy  knobs.     Tiengtb 
of  the  body  one  and  une-t'uurth  lino;  of  the  wings  threo  linos. 
United  States. 

Page  214.     Dolichopiis  ineptus  Vem. 

^Encus,  vortiee  pnrpureo,  alxloniinis  lateril)us  albo  niaenlatis, 
npiee  viridi,  antennis  pedibuscpie  fulvis,  tarsis  siibpieeis,  alia 
einereis  fusco  vittatis. 

Urassy,  beset  with  blaek  Ijristles,  adorned  lieneatli  with  ft 
whitish  covering ;  crown  purple;  eyes  rod;  feelers  tawny,  sixth 
joint  black,  feathered  with  moderately  long  hairs;  alidoinen 
obeonical,  longer  than  the  chest,  green  at  the  tip ;  a  white  spot 
on  each  side  of  every  segment ;  legs  dark-tawny,  clothed  with 
very  short  blaek  hairs;  shaidcs  beset  with  blaek  bristles;  feet 
almost  pitchy;  wings  gray,  tinged  with  brown  along  the  third 
and  fourth  longitudinal  veins;  wing-ribs  tawny;  veins  black; 
poisers  tawny,  with  ferruginous  knobs.  Length  of  the  body  one 
and  one-fourth  line ;  of  the  wings  throe  lines. 

United  States. 


1*1  '(i-i' 


i-;ni 


m 


Mr 


Fage  214.    Dolichopiis  luaculipes  Fem. 

Aeneo-viridis  purpurco  variu.s,  antennis  fulvis  apice  piceis, 
pcdibus  fulvis,  tibiis  nigro  maculatis,  tarsis  piceis,  alls  einereis 
costi  nervoruraque  marginibus  fuseis. 

Brassy-green,  beset  with  black  bristles,  adorned  beneath  with 
a  whitish  covering ;  crown  adorned  with  blue  and  purple ;  eyes 
red ;  feelers  tawny ;  third  joint  pitchy ;  sixth  black,  feathered 
with  moderately  long  hairs;  disk  of  the  chest  partly  purjde; 
abdomen  obeonical,  a  little  longer  than  the  chest,  clothed  with 
short  black  hairs  ;  legs  tawny,  clothed  with  veiy  short  black 
hairs ;  slianks  beset  with  black  bristles ;  feet  almost  pitchy  ;  a 
black  spot  on  the  tip  of  each  thigh  ;  five  or  six  black  spots  on 
each  shank,  these  spots  are  most  distinct  on  the  hind  legs  ;  wings 
gray,  brown  beneath  the  fore  border  and  along  the  borders  of  the 
vein,-* ;  vving-ribs  and  poisers  tawny  ;  veins  black.  Lengih  of  the 
body  one  and  one-half  line ;  of  the  wings  three  and  one-half 
lines. 

United  States. 


■  V 


■te' 


!  /; 


TT 


304 


Ml'Tl;ilA  OK  NollTII  AMI'.ltlC.V. 


[I'AllT  II, 


Page  215.     l>olicllO|iUH  |llllc-lll>r,  Mnn.  ut  Ft>in, 

Cyiiiioo-viridis,  antonnis  iii>rris,  reiiioribus  virklibus,  tiltiis  fiil- 
vis,  liirsis  picc'is  apico  iiijrris,  alls  liii)i>klis. 

Uri^^lit  giTi'U  with  a  I)liiish  tint,  Ixvsot  with  black  bristles, 
aih)nu'(l  liuiioalh  witli  a  whitisli  covt'riiijj; ;  oyes  ))ri>fht  rc(l ;  fcch-rs 
black  ;  sixth  joint  bare;  abdoiiicn  of  the  male  cyliiidrifiil,  of  thi; 
foiiialc  obcuiiical,  t'lothod  with  short  black  hairs,  a  little  Iniiiicr 
than  till'  chest ;  scales  of  the  male  white,  bordercil  with  Ijlack  ;  Icj^-s 
tawny,  clothed  with  very  short  black  bail's;  thiji'hs  gi-een  ;  shaidvs 
besot  with  black  bristles;  feet  )>itcliy,  black  towards  the  tips; 
trocliiintors  of  the  male  yellow,  uf  the  fennde  tawny;  wiiij^s 
colorless;  wing-ribs  tawny;  veins  ))laek  ;  fourth  lonjritudinal  vein 
not  as  usual  converging  to  the  third  after  Its  curve,  but  almost 
parallel  to  it;  poisers  yellow.  Length  of  the  body  1^  line;  of 
the  wings  ;}  lines. 

United  States. 


• 


Page  215.     Dolicliopiis  vai'iils,  Fern. 

vKnco-viridis  cyauco  varius,  abdoinine  fasciis  albidis  ormito, 
antcnnis  pedil)us(iue  fulvis,  tar.sis  nigris,  alis  cinereis,  costi  macii- 
lis{pie  quinque  fuseis. 

Brassy-green,  tinged  with  blue,  beset  witli  Idacl.  bristles, 
adorned  beneath  with  a  whitish  covering;  eyes  red;  feelers  tawny ; 
sixth  joint  black,  feathered  with  moderately  long  hairs  ;  abdomen 
oljconieal,  longer  than  the  chest,  adorned  with  bands  of  whitish 
hue ;  logs  dark  tawny ;  clothed  with  short  black  hairs  ;  shanks 
beset  with  black  bristles;  feet  black  ;  wings  gray,  brown  beneath 
the  fore  border,  adorned  with  four  or  five  brown  spots ;  wing-ribs 
pitchy  ;  veins  black  ;  poisers  tawny.  Length  of  the  body  l^  line, 
of  the  wings  3  lines. 

United  States. 


Walker,  List  of  Dipterous  Insects  in  the  Collection  of  the 
British  Museum,  Part  HI. 

Page  645.    Psilopiis  delicatiis,  n.  s.,  Fern. 

Yiridis,  gracilis,  abdomine  aureo-viridi,  autenuis  fulvis,  articulo 
tertio  nigro,  pedibus  flavis,  alis  limpidis. 
Body  slender,  bright  green,  clothed  with  black  hairs  and  bris- 


Jl:  '• 


''(•jr. 

m 
m 


AI'l'F.NKIX. 


305 


lies;  crown  (if  tlic  Iicad  liliic  ;  vyv>  hri^Iil  ri-d  ;  inoiitli  yi  Ilnw  ; 
(ccltTs  tawny  ;  tliinl  joint  l>lack  ;  Itristk'  lilark,  shorter  tinin  llio 
clicst  ;  alMlnnn'ii  ^oldi'ii-jrn'cii  ;  ley's  pale  yellow,  lonjr  and  slender, 
clotluMJ  with  short  hiaek  hairs  ;  I'eet  jiitehy  l(»wards  the  tips  ;  \\in<rs 
colorless  ;  winjr-rihs  and  pidsers  tawny  ;  veins  pitchy,  liength  of 
the  liody  J]  lines,  of  the  winirs  .">  lines. 

(I.    New  ^'ork.      I're.-ented  liy  the  Kntoniolotrieal  Cliil). 

b.    New  York,      rresenled  liy  !•].  I)oiil)leday,  Ks(|. 

Pagt'  fj4tj.     l*silo|»UA  Ki' III  mi  for,  n.  s.,  .Mas. 

Viridis,  cyaiieo  pnrpwreiMpie  varins,  aniennis  niLTis,  pedihns 
Ihivis,  alls  limpidis,  costi\  apicem  versus  nervisipie  transversis 
fusco-iieliulosis. 

l)ody  l»ri,ij:ht  frreeii,  l)eset  with  hlaek  hairs  and  liristles;  head 
covered  in  front  with  silvery  down;  i'yvs  red;  mouth  tawny; 
feelers  lilack,  as  loiijr  as  the  head  and  the  chest,  disk  of  the  chest 
l)hiish-j!-i'een,  tinu'cd  with  purple;  scutcheon  purple;  sides  and 
lirea>t  covered  with  silvery  itlooin ;  ahdoineu  slender  ;  tip  hlinsh 
jnirple  ;  appendajres  dark  tawny;  leji's  yellow,  lieset  with  hhick 
hairs  and  bristles,  which  are  most  thick  on  the  feet  ;  four  hinder 
idps  {ireeii  ;  thi<>iis  clothed  with  white  hairs;  feet  towards  the  tips 
aiul  liind  feet  pitchy;  wiiiirs  colorless,  clouded  witli  pale  hrowii 
towards  the  tips  of  the  fore  liorders  and  aloiiy  the  cross-veins  ; 
win,!r-ril>s  tawny ;  veins  l)lack  ;  jjoisers  tawny.  Leii<,^th  of  the 
liody  2.7  line.-;,  of  the  win^^s  f)^  lines. 

a.  Trenton  Kails.     Presented  l»y  E.  Douhleday,  Ks(i. 

Page  ti4i).     I'Milopii^i  clirysoprasi,  n.  s. 

Aurco-viridis,  capitis  vertice  jturpiiren-cyanco,  scutello  nl)(h)- 
ii)iuis((ue  basi  })urpureis,  alMlominis  segmentorum  suturis  seneo- 
jjurpureis,  antennis  ni<i'ris,  )»edil)us  )»iccis,  fcin(»ril)us  viri(!il>us, 
tibiis  aiiterioril)us  tarsiscpie  anticis  fulvis,  alis  suljcinereis. 

Body  frolden-<rreen,  beset  with  Idack  bristles ;  head  purplish- 
blue  on  the  cruwii,  slifrhtly  covered  with  white  down  in  front ; 
eyes  bright  red;  mouth  and  feelers  black;  scutcheon  purple;  ab- 
(louieu  adorned  with  purple  towards  tlie  base  ;  sutures  of  the  seg- 
ments brassy-puri>le  ;  legs  pitchy,  tlnckly  dotlied  with  short  l)lack 
hairs ;  hips  and  thighs  green  ;  liijis  slightly  covered  with  white 
bloom,  thighs  fringed  with  white  hairs  ;  fore  shanks  ])ale  tawny  ; 
middle  shanks  and  fore  feet  dark  tawny  ;  wings  sllgiitly  gray ; 
20 


^V-l^ 

•• 

1 1 

' 

"     ■  '  '  1 
;    i 

I 


t, 


i 


III  niii 


m 


Nil 

til 


!'  i 


3no 


DII'TKIIA  OF  NnllTH    \MKHirA. 


f  I'AKT  3: 


win}r-ril)s  mid  poisiTs  ])itcliy  ;  veins  lilm-lv.     T,fiijftli   )f  tlio  hotly  i 
li'ifs,  of  tlic  wiii^rs  4^  lines, 

a.   West  Iiidii'S.      Kroiii  Mr.  CliiMrcii's  collcclioii. 

Tngft  (i48.     INilopilH  Niiuvilllil,  n.  n. 

A'lridis,  ('ii|>ilis  vcrlicc  cviiiico-iinriiiirco,  nltdoiniiic  npicctn  \vr- 
sii>  iiiirpiirco,  uiitciniis  iicdiliuscjuc  nigris,  fi'iiiuribus  viridibiis,  ulis 
liiiipidis,  I'lisco  hifnsfiatis. 

IJody  brijrlit  jrrccn,  Iic^ct  with  lijnck  liristlcs;  liciid  lijiiisli-inir- 
j)l(' on  llic  (Town,  clotlicd  wiiii  wjiitc  down  in  IVoiit  ;  eyes  red  ; 
intMilli  jiitcliy  ;  rccjcrs  l)liick  ;  Itristli'  nt'iirly  i»s  loiii;  us  tlie  clicst ; 
breast  iind  sidos  of  liie  cliest  eovered  with  a  white  bloom  ;  hImIu- 
nien  purple  towards  the  tip;  Icjrs  l»luck,  beset  with  black  hairs  and 
liristles;  hips  and  Ihi^-'hs  j^reen  ;  hips  eoveretj  with  a  white  blonm; 
thijrhs  clothed  with  white  hairs;  winjrs  c(»l(»rless,  adorned  with  two 
brown  ImiimIs,  which  art'  joine<l  tojreiher  on  the  lore  border  iind 
more  sliu'litly  on  the  disk,  but  do  not   reach  tin;  hind  border  nor 

xi        i  •  .......11.1 ! ..:i 1     : !.    1  ..  T      .       .  I        !■ 


» ,      ., r. 

UKU'e  sliu'htly  on  the  disk,  but  do  not  reach  the  hind  border  noi 
the  tip;  veins  black ;  winj;-ribs  ami  poisers  pitchy.  Leng'th  ol 
the  body  2};  lines,  of  the  winjrs  o  lines. 

«.   .Famaica.      From  Mr.  (Jrosse's  collecti'"' 


Page  (>48.     PsilopilH  ailiatlis,  n.  ».,  Mn».  et  Tem. 

Yiridi.s,  eajtitc  ])urj»ureo,  abdomine  nijrro-fasciato  apice  pur- 
puroo,  antennis  nifrris,  i)edil)ns  pioeis,  feniorilius  viridibiis,  alis  siib- 
cinereis,  costfi  ajticeni  versus  nervisipie  traiisversis  I'lisco  nobulosis. 

Hody  britrht  g-rceii,  beset  with  black  hairs  and  I)rist]es;  head 
]»Mr))le,  covered  in  front  with  white  down  ;  crown  of  the  male 
adorned  with  a  frreon  s])ot  on  each  side  ;  eyes  red  ;  mouth  and 
feelei  black  ;  bristle  a  little  slnu'ter  than  the  chest ;  hind  ))art  of 
the  elicst  tinjred  with  blue  and  juirple ;  sides  and  lireast  covered 
with  white  down  ;  abd(»men  at  the  tip  ])urple  in  the  male,  bluish- 
purple  in  the  female  ;  hind  liorders  of  the  sejrnients  in  the  male 
adorned  with  black  bands  ;  loffs  pitchy,  beset  with  ))lack  hairs  and 
bristles ;  liii)s  and  thijrhs  green,  the  former  covered  with  white 
down  ;  wiiifjs  slitrhtly  gray,  indistinctly  marked  witli  brown  towanis 
the  tips  of  the  fore  borders  and  along  the  cross-veins;  wiiig-ril»s 
l^itchy  ;  veins  black  ;  poisers  of  the  male  pitchy,  of  the  female 
tawny.     Length  of  the  body  H — 1  f  li'"',  of  the  wings  ;i;J — 4  lines. 

n.   New  York.     Presented  by  K.  Doubleday,  Ks(|. 

b.   Trenton  Falls.     Presented  by  E.  Doubleday,  Esq. 


AIM'KNKIX. 


rn^e  r)4:>.     INilopUH  iiidcltiis. 


v)^ 


n.  ». 


Viridis,  cnpito  iiiirpiirro,  iilidDiiiiiM'  iiiir|»mrn,*  iilMlniiiin(>  pur- 
piirco-ryiiiiro.  lusriis  iiit'ris,  aiiti'iiiiis  |»('tliljiis(|iit!  iiivjris,  iilis  siili- 
cincrfis  I'liscd  Itifiisciutis, 

llcinl  iiiitl  clirst  Im'scI  willi  lilin'k  lirisllos  ;  liciid  ]iiir|ilt',  IViiiLrid 
iili.tiil  tlic  inoiilli  will)  lioarv  liiiirs  ;  eves  dmI  ;  iiioiilli  niid  t'ci'lriN 
Idiu'k  ;  l)rihtle  ii  litllc  Innircr  tlniii  tlic  clit'st  ;  clicst  frrccii  ;  sides 
utid  Itrciist  cuviM'cd  witli  \vliiti>)i  down;  niidniiicii  d<'i'p  piirpHsli- 
liliic  ;  siitiircs  of  llic  sf'L'iiH'iits  Itlack  ;  It'u's  Mack,  clutlifd  with 
black  liairs  and  Itristlcs;  \viii<:s  f.liu-litly  jri'ay,  aduriicd  witli  (wd 
Itmwti  l)aiids,  which  are  united  on  tiio  fore  bonier,  l»ut  do  not 
reach  tlie  hind  liorder;  winir-rilts  and  veins  I)lack ;  poisers  pitchy, 
with  tawny  knobs.    licnjftli  of  the  body  2,1  lines, of  tiie  winj^s  f)  lines. 

a.  Mexico.      I'resejited  liy  K.  I*.  Collin,  Ksi]. 

Page  ortO.     PhiIoimih  iiiKrofciiiorHtiiH,  MSB. 

Cyaiii'o-,  ant  anreo-viridis,  aniennis  ni^rris,  eapite  dupio  loniri- 
oribns,  pediltus  nijrris  tibiis  fnlvis,  alis  linipidis. 

Head  and  chest  briu'ht  Idnish-frreen,  aniie(l  with  black  bristles; 
head  covered  in  front  witli  white  down,  elotheil  l)eneath  with  whito 
hairs;  eyes  red;  month  tawny;  feelers  black,  abont  twice  the  lenirlh 
of  the  head;  l>reast  and  under  side  of  th<'  abdomen  covered  with 
white  bloom;  al)domeu  jrolden-preen,  blue  at  the  base,  cop|)ciy  at 
the  tip  ;  le<rs  Idack,  beset  with  a  few  black  bristles  ;  shanks  tawny, 
with  black  tips  ;  winu-s  colorless  ;  winjr-ril)s  tawny  ;  veins  black  ; 
poisers  yellow.     Leiijrth  of  the  laidy  ]\  line,  of  the  winu's  ^h  lines. 

Var,  3.  Chest  golden-frreen,  bluish-urreen  behind;  abdomen 
coppery-jrreeu  ;  tips  of  the  thigh.s  and  the  whole  of  the  shanks 
tawny. 

Var.  y.  Abdomen  l)ri^ht  irreeii  or  l»liii.sh-frreon  ;  a  bronze  band 
on  the  fore  border  of  each  se^nnent. 

(I.   North  America.      Presented  by  the  Kntomolofrjcal  Clidi. 

b.  Nova  Scotia.     From  Lieut.  Hednmn's  cMjllei'tioii. 

Page  Cni.     PsilopiiH  albifoxa  Mas.  ct  I'V-m. 
Cyaneo-,  ant  cupreo-viridis,  antennis  niu'ris,  capile  dnplo  loiiiri- 
oribus,  ])edibus  flavis,  tarsis  jtostieis  nijrris,  alis  subciiiereis. 
Head  and  chest  armed  with  l)laek  bristles;   head  I)luisli-}i-reen, 


)-'i . 


^-  'MM'^ 


f^;- 


*  Evidently  a  inisjniiit  in  the  original. 


n 

' 

i 

!    ■ 

w 


III 


308  KirTKRA  OF  NOllTFI  AMERICA.  [PAUT  tt. 

covered  in  front  witli  white  down,  clothed  beneath  with  wliile  luiirs  ; 
eyes  red;  nioutii  tawny;  feelers  bhick,  about  twice  the  leiigtii  of 
liie  head;  palpi  black  ;  chest  of  the  nmie  bliiish-g-reen,  sometimes 
black  towards  tlie  tip,  of  tlie  fcnuiie  )>rigii(  green  or  coppery-frreen  ; 
sntiires  of  the  setrments  sometimes  black;  breast  and  under  side  of 
the  al»donien  covered  with  white  (htwn  ;  legs  yellow,  adorned  witli 
rows  of  minute  spines,  clothed  with  a  few  white  liairs,  and  beset 
with  a  few  black  bristles;  four  hinder  lni)s  frreen  ;  tips  of  feet 
black;  hind  feet  black,  first  joint  brownish  ;  wings  slightly  frniy, 
wing-ribs  tawny  ;  veins  black  ;  poisers  yellow.  Length  of  the 
body  1:J  line  ;  of  the  wings  2}j  lines. 

(I.   North  America.     J'resented  by  tlie  Entomological  Club. 

/>.   Ohio.     Presented  by  the  Entomological  Club. 

c.   .Massachusetts.     From  Prof.  Sheppard's  collection. 

(f.   Nova  Scotia.      From  Lieut.  Hcdnum's  collection. 

Page  (i5L     Clirysof  ilH  inccrtlis,  n.  s. 

Yiridis,  antennis  nigris,  femoribus  viridibus,  tibiis  fulvi.s,  apice 
tarsis(pie  obscurioribus,  alis  limpidis. 

Allied  to  C.  femoral  iff.  JJody  green,  beset  with  black  hairs  and 
}»rlstlcs;  eyes  red;  nn»\ith  and  feelers  black;  hips  and  thighs 
green  ;  shanks  tawny  ;  feet  and  fi])s  of  shanks  dark  tawny  ;  wings 
colorless;   wing-rii)s  pitchy  ;   veins  black  ;   poisers  tawny. 

a.  United  State-       Presented  by  the  Entomological  Club. 

Page  (if)."?.    I>or|»liyi-o|is  pilosicornis,  Rarnston's  MSS. 

yEneo-viridis,  antennis  nigris,  pedibus  fulvis,  tarsis  piceis, 
femoribus  posticis  apice  fnsco  nuicnlatis,  alis  limpidis. 

IJody  brassy-green,  beset  with  black  bristles;  eyes  dark-red; 
mouth  dark  tawny;  feelers  black;  bristle  downy,  proceeding  from 
the  base  of  the  third  joint  and  more  than  twice  its  length ;  breast 
an.d  sides  of  the  chest  covered  with  a  white  bloom,  which  ajipears 
also  on  the  chest,  but  is  there  very  slight ;  legs  tawny,  clothed 
with  short  black  hair,  beset  with  a  few  black  bristles ;  feet  pitchy; 
a  small  brown  mark  on  the  tip  of  each  hind  thigh  ;  fore  hips  at 
the  base  ami  the  other  hips  green  and  covered  with  white  bloom; 
wings  colorless  ;  wing-ribs  tawny ;  veins  black  ;  poisers  yellow 
Length  of  the  body  \^  line;   of  the  wings  2i-  lines. 

a.  St.  Martin's  Kails,  Albany  llivcr,  Hudson's  Bay.  Presented 
by  G.  IJarnston,  Esij. 


ArPKXDIX 


30!) 


Page  (!.'),'■).     IVIedoteriiH  ^labcr,  Baunston's  MSS. 

"\'iri(lis,  lliKi'iK'is  disco  iiij:;r(»-ii'iu'().  iilKloiiiiiie  ai'iu'o-viridi,  iiiittii- 
nis  nijjris,  pcdihiis  viridibus,  tjirsis  iiigris,  alls  cincrcis,  I'lisco  hiiiia- 
ciilatis. 

l><Mly  •jrn'oii  ;  liend  mid  clicsf  Ix'sct  willi  a  lew  Idack  liairs  ;  head 
covered  with  wldto  Itiooui  in  llie  male,  witli  li-oideii  hlooiii  in  tlie 
leiiiale  ;  eves  red;  iiiontli  and  feelers  Mack;  disk  of  tiie  cliest 
l)ron/.e-l)Iaek  ;  sides  covered  with  tawny  hlooni  ;  hrcast  covered 
with  whit(!  hlooni  ;  alidonien  I)rassy-jrreen,  covered  aliove  with 
short  tawny  hairs;  under  side  covered  with  white  lth)oin  ;  Icu's 
l)r!,u-ht  <;reen,  rather  stont,  <'h)thed  with  short  Mack  hairs  and 
bristh's  ;  liips  covered  witli  wlntc  )ih)oni  ;  feet  hhick  ;  wind's  liTay  ; 
eael)  with  two  small  ))r(twn  s]>ots,  one  on  tiie  cross-vein,  the  other 
on  the  fourth  lonu-itndinal  vein,  u  little  before  half  the  di.-tane'j 
between  the  cross-vein  and  the  tipof  the  win^-;  winjr-rilis  piteliy; 
veins  black  ;  jjoisers  tawny.  Lenjilh  of  the  body  1.^'  line;  of  the 
win;j^s  r>  lines. 

o.  St.  Martin's  Falls,  Albany  ]Jiver,  Ilndson's  IJay  I'rcMiitod 
by  (1.  IJarnstoii,  Es(i. 


ill' 


m: 


Page  G5r).     IHeiR'tei'lIs  elirysolomis,  Rahnston's  MSS.,  Vem. 

Ni<;ro-aMieiis,  antennis  niirris,  ))edil)us  viridibus,  tarsis  idjjfris, 
alis  cinereis,  fnsco  biinacnlalis,  ad  costam  subfuscis. 

IJody  brassy  black  ;  head  coveri'd  with  n'olden  l)looni,  which  is 
jniler  and  l)riirhter  tctwards  themo'.ilh  ;  eyes  dark-red,  covered  with 
white  down  ;  moutli  and  feeh'rs  black  ;  sides  of  the  chest  covered 
with  tawny  bloon\  ;  lireast  and  under  side  of  tlw;  al)dome)i  adorned 
with  white  l)looin  ;  a  row  of  black  ))nnctnres  on  each  side  of 
the  abdomen,  as  in  other  species;  leirs  green,  clothed  with  Idack 
hairs  and  bristles  ;  hips  and  thiirhs  covered  with  white  Idooni  ; 
feet  black;  winirs  <ii'ay,  l>rown  aloni;  the  fore  borders,  each  with 
two  darker  brown  si)ots,  like  those  of  Jf.  (jhihfr,  lait  larj;er  and 
more  distinct;  winir-ribs  tawny;  veins  black;  poisers  j)itchy. 
Leiifrth  of  tlie  l)ody  1  j  line  ;  of  the  wiiiirs  W  lines. 

,7.  St.  Martin's  Falls,  Albany  Uiver,  II udsou's  Day.  Proacntecl 
by  G,  JJarnston,  Esq, 


wwr, 


DIPTKUA  OF  NOKTII  AMERICA. 


[I'Aiir  II. 


ill 


rage  (i'lG.     Ulc'tleterus  ulboflorens^,  n.  s.,  Fein. 

^Eiit'us,  fulvo  ])ul)e,sec'iis,  siibtus  ull'us,  alKloiuino  ciiprco-viridi, 
aiiteniiis  iiigris,  pedibus  viridibus,  tui'sis  piceis,  alis  ciiiercis  fuseu 
sidtvittatis. 

Jload  and  chest  bronzed,  beset  witli  a  few  black  l)ristles,  thickly 
covered  with  tawny  bloom  ;  eyes  dark  red,  covered  with  wliiu- 
down  ;  mouth  and  feelers  black  ;  abdomen  rather  light  jirecii, 
mingled  with  copper-eolor,  thinly  clothed  with  short  black  hairs, 
not  longer  than  the  chest ;  hind  chest,  breast,  and  under  side  (if  the 
ai)d(»men  covered  with  white  bloom  ;  legs  long,  slender,  green, 
slightly  covered  with  tawny  bloom,  ])eset  with  short  black  hairs  and 
liristh's;  I'eet  pitchy  towards  the  tips;  claws  black;  foot-cushions 
pale  yellow  ;  wings  gray,  very  slightly  cloud.-d  with  bnjwn  along 
the  borders  of  the  veins;  wing-ril)s  pitcli\  ;  \cisis  black;  poisers 
tawny,  pitciiy,  and  covered  with  white  bloom  towards  the  tips. 
Length  of  the  body  1 ;',-!. y  line;  of  the  wings  4-4^  lines. 

a.   Nova  Scotia.     From  Lieut.  Rednuin's  collection. 


m 


h 

■ 

._ 

HMi 

\ 

lK:i'll : 

Page  C'lO.     I>olicllopus  aflillis,  IIaliday's  MSS.,  Mas.  et  Fern. 

Cyaneo-,  aut  cui>reo-viridis,  antennis  nigris,  pediims  (lavis,  femo- 
ribus  posticis  tarsisque  fulvis,  tarsis  anticis,  mari.  apice  nigris 
dilatiltis,  tarsis  posticis  nigris,  alis  limpidis. 

_}[(il('. — Head  and  chest  green,  armed  with  stout  black  bristles  ; 
head  fringed  behind  with  pale  tawny  hairs,  covered  in  front  and 
beneath  with  white  bloom;  eyes  red,  covered  with  white  down; 
feelers  black  ;  chest  bluish-green  on  the  disk  ;  abdon;  n  .-oppery- 
grecn,  clothed  with  short  black  hairs,  covered  with  v\  iiit'  iiUiom 
l)eneat!i  anil  on  each  side,  where  there  is  a  row  of  black  j»u('(  utes; 
appendages  ])ale  yellow  ;  legs  yellow,  clothed  with  short  black 
liairs  ;  four  hinder  hii)s  green  ;  hind  thighs  tawny,  furnished  with 
a  few  tawny  hairs  ;  shanks  and  feet  armed  with  lihick  bristles  ; 
feet  tawny,  darker  towards  the  tips;  hind  feet  black  ;  tips  of  fore 
feet  black,  widened  ;  wings  colorless  ;  wing-ri  js  and  poisers  yel- 
low ;  veins  i)itchy. 

lu'mole. — IJody  coppery -green  ;  legs  tawny;  shanks  darker 
than  the  thighs  ;  hind  feet  pitchy.  Length  of  the  body  2-2^  lines; 
of  the  wings  4-r)  lines. 

a.  Nova  Scotia.     From  Lieut,  llcdmau's  collection. 


AI'PKNDIX. 


nil 


Page  600.     Doliclioiilis  cil|>l'iilUH  7  Wii-n.,  Aniss.  Zweif.  ii,  230,  1. 
D.  ctipreiis  ?  Say,  Joiini.  Ai-ad.,  I'hila.,  iii.  8,  (J. 

Aureo-viridis,  tlionuc  vittis  tri'tuf  cupivis,  aiiteiuiis  fulvis  apico 
fu.sei.s,  pi'diljiis  (lavis,  larsLs  apico  iiiyris,  aiilicis  aiiice  iiigro-fasoi- 
t'ulati.s,  alis  suliciiioreis. 

JJixly  {^riH'ii,  c'ovt'i'od  above  with  jroldcn  rlown,  hcncatii  witli 
■white  down;  head  and  chest  armed  with  stout  I)laek  l)risties ; 
Iiiiid  part  of  tlie  iiead  Iriiijifd  witli  white  hairs;  eyes  red  ;  iiioiilii 
yellow;  feelers  tawny,  covered  with  short  l)lack  hairs  ;  tlieir  tips 
brown ;  bristle  pubescent,  pitchy,  lon^'er  than  the  rest  of  the 
feelers ;  chest  adorned  with  tiiree  coppery  stripes  ;  abdomen 
g-olden  green,  ehjthed  with  short  Itlack  hairs,  white  l)enealh  and 
on  each  side,  where  it  has  a  row  of  Itlaek  pnneiun's  ;  appendages 
yellow;  legs  yellow,  ehjthed  with  black  hairs;  four  hinder  hii»s 
green;  feet  towards  the  l)ase  and  shanks  armed  witii  Idaek  l)ristles; 
four  hinder  feet  black  towards  the  tii)s  ;  tii>s  of  fore  feet  adorned 
with  tufts  of  black  hairs  ;  wings  slightly  gi-ay  ;  wing-ribs  tawny  ; 
veins  pitchy  ;  poisers  yellow.  Length  of  the  body  "J.V  lines  ;  of 
the  wings  ;")  lines. 

a.  St.  Martin's  Falls,  Albany  River,  Hudson's  I>ay.  Presented 
by  (ir.  Barnston,  Esq. 

Page  (Ji;0.     DoIicllopilK  laniellipes,  Bak.nston's  MSS.,  Mas.  et  Fern. 

Yiridis  aut  viridi-cupreus,  abdoniine  sul)tus  allto-pubescente, 
antennis  nigris  ))asi  I'idis,  articulo  tertio  niuri.  longo,  pedil)us 
fulvis,  tarsis  nigris,  interniediis  basi  fulvis,  auticis  }iiari.  apicu 
dilatatis,  alls  linipidis. 

Body  green  ;  head  and  chest  armed  with  black  bristles ;  head 
covered  with  silvery  down,  fringed  l)ehind  with  black  hairs  ;  eyes 
red  ;  mouth  tawny  ;  feelers  l)lack  ;  lirst  joint  jiale  red  ;  third  joint 
very  long  ;  abdomen  chjthed  with  black  hairs,  adorned  wdh  a 
coi)pery  tinge  towards  the  tip,  which  is  I)liick.  covereil  with  white 
bloom  l)eneath  and  on  each  side,  where  there  is  a  row  of  black 
punctures;  legs  i)ale  tawny,  four  hinder  hips  green,  clothed  with 
black  hairs  and  bristles;  feet  black;  tips  of  fore  feet  widened; 
middle  feet  tawny  towards  the  base  ;  wings  colorless  ;  wing-ribs 
tawny  ;   veins  pitchy  ;   jutisers  pale  tawny. 

Fi'inalc. — Third  joint  of  the  feelers  short,  nearly  round. 
Length  of  the  body  2^—3  lines;  of  the  wings  5  lines. 


'0':, 


W 


fv'l ,  •  i  j  - 


:,,) 


'\^A 


J 


m 


i% 


312 


DIFFKUA  (IF  XORTir  AMERICA. 


[part  ir. 


'■'^ 


h  < 


^vUi 


Var.  /3.   Clicst  and  abdoiiicn  ('(iiipcry. 

a.  St.  ^lartiii's  Falls,  Albany  ilivor,  IIirIsuh's  Bay.  Pri'sou'ad 
by  G.  Uanistoii,  Esq. 

Page  GUI.     Dolichopiis  ciliatlis,  Bakxstos's  MSS.,  Mas.  et  Tcm. 

Viridis,  capitis  fronte  aurco-pubesceiite,  aiiteiiiiis  fulvis,  arti- 
t'ulo  3°  supra  nigro,  jx-dibiis  fulvis,  tarsis  piceis  alis  suhciiiercis. 

Body  frroen  ;  head  covcrod  in  front  witii  frnldcn  down  ;  eyes  rod  ; 
mouth  l)lac'k  ;  feelers  tawny  ;  third  joint  nearly  oval,  Iilaek  from 
near  the  base  to  the  tip  above,  and  from  half  its  lenfrth  to  the  tip 
beneath  ;  bristle  black  ;  breast  and  sides  of  the  ehest  and  of  the 
abdomen  covered  with  white  Ijloom  ;  ai)])onda<res  of  the  alidonion 
tawny;  scales  white;  lefrs  tawny;  feet  ])itehy ;  fore  feet  dark 
tawny  ;  win<rs  slisrhtly  jrray  ;  winjr-ribs  tawny  ;  veins  black  ; 
l)oisers  yellow.  Length  of  the  body  1^-1^-  line;  of  the  wings  3 
lines. 

a.  St.  Martin's  Falls,  Albany  Ilivcr,  Hudson's  Bay.  Presented 
by  G.  Baniston,  Esq. 

Page  661.    Dolichopii»  adjacens,  n.  s.,  ppm. 

J*]ncus  viridi  varius,  capite  cyaneo-viridi,  antennis  nigris,  pedi- 
bus  fulvis,  tarsis  posticis  jiiceis,  alis  suljcinereis. 

Head  bluLsh-green  on  the  crown,  covered  in  front  with  yellowish 
white  down,  fringed  along  the  eyes  with  hoary  hairs ;  eyes  red  ; 
mouth  pitchy  ;  palj)!  tawny  ;  feelers  black  ;  third  joint  very  short ; 
chest  and  abdomen  In-assy,  mingled  with  gi'ceii ;  breast  and  sides 
of  the  chest  covered  with  gray  bloom,  wliich  also  api)ears  beneath 
the  abdomen,  but  is  more  slight ;  legs  tawny ;  hips  green,  covered 
with  gray  bloom  ;  fore  hips  mostly  tawny  ;  feet  darker  than  the 
shanks,  especially  towards  the  tips;  hind  feet  pitchy;  wings 
slightly  gray  ;  wing-ribs  and  poisers  tawny  ;  veins  black.  Length 
of  the  body  3  lines;  of  the  wings  fi  lines. 

a.  St.  Martin's  Falls,  Albany  lliver,  Hudson's  Bay.  Presented 
by  G.  Barnston,  Esq. 

Page  661.     Dolichopiis  coercens,  n.  s.,  Mas. 

Tiridis,  capite  cyaneo-viridi,  thoracis  lateribus  cupreo  et  cyanro 
ornatis,  abdomine  cupreo  vario,  apice  nigro,  antennis  nigris,  pedl- 
bus  fulvis,  alis  limpidis. 


;'.soiiic(i 


APPENPTX. 


313 


Head  1)luish-jj:roon,  covered  in  front  with  pale  tawny  down, 
frinjred  along;  the  eyes  with  white  hairs;  eyes  bright  red;  nionih 
pitchy  ;  i'eelers  black  ;  third  joint  very  short ;  chest  <rreen,  sliu'Iitly 
tiii,i::(Ml  on  each  side  with  blue  and  c<)i)])er  color;  disk  sonietinies 
bluish-green  ;  breast  covered  with  hoary  down  ;  abdomen  green, 
with  a  coppery  tinge  here  and  there  ;  tip  black;  appendages  pale 
tawny;  scales  white,  bordered  with  black;  legs  tawny;  hips, 
towards  the  base,  green,  and  covered  with  a  white  bloom  ;  shanks 
beset  with  black  bristles  ;  feet  pitchy  towards  the  tips  ;  fore  feet 
slender,  jtale  tawny  ;  their  tips  black,  and  much  widene<l  ;  wings 
colorless  ;  wing-ril)s  and  poiser  tawny  ;  veins  black.  Length  of 
the  body  3  lines;  of  the  wings  oh  lines. 

a.   Xew  York.     Presented  by  the  Entomological  Club. 


r.,  ■'■(; 

■  ■ '  .'  *  ■ 

"■It  .;  i : 


Page  G62.     Dolicliopus  fiiiitus,  n.  s.,  Mas- 

Tiridis,  thoracis  lateribus  abdominetjue  cupreo  variis,  hujus 
lateribus  basi  eyaneo-viridibus,  antennis  nigris,  pedibus  fulvis, 
tarsis  apice  uigris,  tarsis  auticis  apice  latis,  tarsis  posticis  nigris, 
alls  subcinereis. 

Body  green ;  head  covered  in  front  with  white  down  ;  fringed 
along  the  eyes  witli  White  hairs  ;  eyes  red  ;  mouth  pitdiy  ;  palpi 
tawny;  feelers  blark ;  third  joint  rather  large;  chest  with  a  slight 
coppery  tinge  mi  each  side,  which,  like  the  breast,  is  slightly 
covered  with  hoary  bloom ;  abdomen  tinged  with  coppery  color, 
and  with  a  slight  blue  hue  on  each  side  towards  the  base  ;  append- 
ages at  the  tip  tawny ;  scales  white,  bordered  with  black ;  legs 
tawny,  middle  feet  towards  the  ti|)s,  and  hind  feet,  excepting  tiie 
base,  black  ;  tips  of  fore  feet  black  and  somewhat  widened  ;  wings 
slightly  gray,  wing-ribs  and  poisers  tawny;  veins  j)itchy.  lu'm. — 
Feet  black,  tawny  at  the  base.  Length  of  tlie  body  3  lines  ;  of 
the  wings  5  lines. 

a.  New  York.     Presented  by  the  Entomological  Club. 


hW- 


Page  662.     DolichopiiH  distractiis,  n.  s. 

Yiridis,  abdomine  cupreo,  antennis  nigris,  articulo  1°  subtus 
fulvo,  pedibus  fulvis,  tarsis  apice  piceis,  alis  subcinereis. 

Body  green ;  head  covered  in  front  with  white  down,  clothed 
on  each  side  of  the  eyes  with  white  hairs;  eyes  bright  red  ;  feelers 
black ;  first  joint  tawny  beneath  ;  third  joint  short  and  broad ; 


,1  -■■■^ 


;  1 

■  '   M' 


"If 


314 


DIl'TEUA  OF  NOllTII  AMKUICA. 


[part  ir. 


alxlonion  copper  coIoixmI  ;   lof^s  tawny ;   fi'ot  piteliy  towards  tlio 
tips;   wiiius  slightly  gv'dy,   wing-ribs  and  poisers  tawny;    veins 
Itlack.      liungtli  of  tho  body  'Ji  linos  ;   of  tlio  wings  5  lines. 
a.   New  York.     I'resenled  by  K.  Doubleduy,  K>i[. 

Page  G()2.     Uolicliopus  discei^siis,  n.  s.,  Fem. 

f'yaneo-viridis,  thoraee  onpreo  bivittalo,  abdoniinc  aMioo-viridi, 
nntcnnis  pedibus(iue  fulvis,  tarsis  i)ostieis  ])iceis.  alis  sul)cinereis. 

Jiody  bluisli-g'''en  ;  head  covered  in  front  with  white  down  ; 
eyi's  brigiit  red;  uuth  and  feelers  tawny;  bristle  black ;  chest 
ad<triie'l  with  two  l)rigiit  copper-colored  stripes;  sides  and  breast 
covered  with  white  bloom  ;  abdomen  green,  brassy  here  and  there, 
especially  towards  the  tip  ;  sides  and  under  side  covered  with  white 
down  ;  legs  tawny  ;  tips  of  feet  and  hind  feet,  except  the  base, 
]>itcliy  ;  wings  slightly  gray  ;  wing-ribs  and  j)oisers  tawny  ;  veins 
black.     Length  of  the  body  2}j  lines;  of  the  wings  5-^^  lines. 

a.  Massachusetts.     From  Prof.  Sheppard's  collection. 

Page  (i(>3.     Doliclio|iiis  contigiiiis,  n.  s.,  Mas. 

Aureo-viridis,  thoraco  viridi-cyaneo,  lateribus  purpureo  variis, 
abdoniine  cyaneo  et  cupreo  vario,  antennis  nigris,  ])edibus  fulvis, 
tarsis  anticis  apice  nigris  latis,  tarsis  mediis  piceis,  basi  fulvis, 
tarsis  ))osticis  nigris,  alis  linipidis. 

Head  golden-green,  covered  in  front  with  pale  tawny  down  ; 
eyes  briglit  red  ;  feelers  black  ;  third  joint  oval  ;  chest  greenish- 
bine,  with  a  slight  purple  tinge  on  each  side  ;  abdomen  golden- 
green,  slightly  bluish  and  coi)pery  here  and  there  ;  breast  and 
under  side  of  the  abdomen  covered  with  hoary  bloom  ;  tip  black  ; 
appendages  tawny,  scales  whitish  ;  legs  tawny  ;  four  hinder  hips 
mostly  green,  and  tinged  with  hoary  bloom  ;  tips  of  fore  feet 
lilack,  much  widened  ;  middle  feet  pitchy,  tawny  at  the  base  ;  hind 
feet  black  ;  wings  colorless  ;  wing-ribs  and  poisers  tawny  ;  veins 
])itcliy,  tawny  towards  the  base.  Length  of  the  body  2  lines  ;  of 
the  wings  4  lines. 

a.  New  York.     Presented  by  the  Entomological  Club. 

Page  G63.     Doliclioiiiis  exclusii^i,  n.  s.,  Fem. 

Cupreus,  nonnun([uam  viridi  varius,  abdomine  purpureo-cupreo, 
antennis  nigris,  articulo  primo  subtus  fulvo,  pedibus  fulvis,  tarsis 
nigris,  alis  subciuereis. 


VM-i 


APPENDIX. 


315 


l»(i<ly  fopptT}',  soinetiiiios  varicil  with  green  ;  luad  fovcrcfl  in 
front  witli  white  bhxtni  ;  eyes  red  ;  month  i»itt'hy  ;  jtalpi  tawny  ; 
I'ooh'rs  hhick  ;  first  joint  tawny  licncath  ;  tliinl  joint  oval,  as  lon<? 
us  the  first  and  tiie  second  ;  hreast  covered  wilii  jiray  l)looni  ; 
nl)doinen  purplisii  cojjper-coior,  covered  henealh  with  uray  lilooni ; 
leu's  tawny  ;  hips  coppery  ;  fore  hips  mostly  lawny  ;  feel  l)laek  ; 
wintfs  sliji'htly  ^ray  ;  winir-rilts  tawny;  veins  lilaek  ;  poisers  pale 
tawny.      Len<;th  of  tlie  Ixidy  2  lines;   of  the  wintis  4^,  lines. 

a.  St.  Martin's  Falls,  Albany  Iliver,  Hudson's  iJay.  rrcsented 
by  G.  narnst(jn,  Ksq. 

Page  (it;4.     Dolicliopiis  coiifiiiis,  n.  s.,  1m-ui. 

.Enens,  viridi  varins,  capite  viridi,  antennis  ni^iris,  pedibus 
fulvis,  tarsis  pieeis,  til)iis  postieis  apice  tarsisipie  poslicis  nig-ris, 
alis  cinereis. 

]>ody  brassy,  mingled  here  and  there  with  g'rceii  ;  head  green, 
covered  in  front  with  white  down,  chjthed  along  the  sides  of  tiie 
eyes  with  white  Inurs  ;  eyes  red  ;  month  pitchy  ;  feelers  l>laek  ; 
third  joint  nearly  oval,  rather  short;  breast  covered  with  white 
bloom;  legs  tawny;  feet  pitchy,  tawny  towards  the  base;  hind 
feet  and  tips  of  hind  shanks  black  ;  wings  gray  ;  wiiig-ril)s  and 
]ioisers  tawny  ;  veins  black.  Length  of  the  boily  '2  lines  ;  of  the 
wings  4  lines. 

(I.  St.  Martin's  Falls,  Albany  Kiver,  Hudson's  IJay.  Presented 
l)y  («.  IJarnston,  Esij. 

rnsH  Cii'A.    Dolicliopiis  conteriHiniis,  n.  s.,  Mn». 

Yiridis,  thoracis  disco  al)domine(pie  aureo-viridil»ns.  Inijus  apice 
UMieo,  tntennis  nigris,  pedil)us  fulvis,  tarsis  antiei>  apice  nigris 
latis,  tarsis  mediis  a))ice  ]iosticis(pie  pieeis,  alis  limpidis,  /mi. 
tarsis  ))iceis  basi  fulvis,  tarsis  postieis  nigris. 

IJody  brigiit  green  ;  head  covered  with  tawny  down,  fringed 
o.long  the  sides  of  the  eyes  with  white  hairs;  eyes  iirigiit  red, 
covered  with  white  down,  niouih  ])itchy ;  jtalpi  tawny;  feelers 
black;  third  joint  rather  large;  abdomen  and  disk  of  the  chest 
golden-green  ;  breast  and  sides  of  the  chest  covered  with  hoary 
bloom,  which  also  slightly  tinges  the  under  side  of  the  abdomen  ; 
tij)  of  the  abdomen  brassy  ;  appendages  tawny  ;  scales  white, 
slightly  bordered  with  black;  legs  ])ale  bright  tawny  ;  four  hind 
hips  mostly  green,  and  covered  with  a  white  bluoui ;  thighs  friiigod 


W':    ft 


iv.|. 


I  y.M 


H"-*; 
•^»i* 


VV'.f 

\'   ': 

( 

■ 
•  - 1 

•!i 


310 


DTl'TKUA  OF  NOlVni  AMKUirA. 


[I'AUT  ir. 


with  wliitc  liiiirs,  fore  fcot  .slender,  with  l)hi<'k  ami  much  widened 
tii)s  ;  mi  Idle  feel  pitchy  towards  tlie  tips;  hind  feet  ]iitchy;  winj; 
cohjriess ;  winj;-ril)s  tawny ;  veins  l)!ack  ;  j)(Mseis  pal(;  tawny. 
Ft'in. — Feut  pitdiy,  tawny  towards  the  hase  ;  hind  feet  black. 
Leii<j;th  of  the  hody  2  lines  ;  (»f  the  winjrs  4  lines. 

a,  New  York.      J'resented  by  E.  Doiihleday,  Ks(j. 

b.  Xortli  America,     rreseiited  by  the  Entomological  Club. 


Page  Gijf).     DolicliopilH  Hepai'utiis,  n.  s.,  Fem. 

Viridis,  abdominis  apice  cui)reo,  autennis  fiilvis,  articulo  tcrtio 
apice  in<rro,  pedil)us  fulvis,  tarsis  nijiris,  alls  subeinereis. 

IJody  green  ;  head  covered  in  front  with  tawny  down  ;  eyes 
red  ;  mouth  pitchy  ;  i)alpi  tawny;  feelers  tawny;  third  joint  oval, 
black  towards  the  tij) ;  bristle  black;  breast,  sides  of  the  chest 
and  under  side  of  the  abdomen  covered  with  white  bloom  ;  alxlomen 
coppery  towards  the  tip ;  legs  tawny ;  four  hind  hips  green, 
covered  with  white  bloom  ;  feet  black  ;  wings  slightly  gray  ;  wing- 
ribs  and  poisers  tawny  ;  veins  black.  Length  of  the  body  2  lines  ; 
of  the  wings  4  lines. 

a.  St.  .Martin's  Falls,  Albany  Klver,  Hudson's  Bay.  Presented 
by  G.  Uarnston,  Esq. 


i 


i-    1 


Page  6Cr>.    Dolichopiis  terminatiis  n.  s.,  Fem. 

Aureo-viridis,  capite  cyaneo-viridi,  abdomine  cu|)reo  basi  viridi, 
autennis  nigris,  pedibus  fulvis,  tarsis  ])iceis  basi  fulvis,  alls  sub- 
cinereis  fusco  subvittatis. 

Head  l)luish-green,  covered  in  front  with  golden  down,  fringed 
on  each  side  with  white  hairs  ;  eyes  bright  red ;  mouth  pitchy ; 
palpi  tawny  ;  feelers  black  ;  third  joint  nearly  oval ;  cliest  golden- 
green  ;  sides  and  breast  covered  with  hoary  bloom,  which  also 
ai)pears  beneath  the  abdomen  ;  abdomen  copper-color,  green  at 
the  base ;  legs  tawny ;  four  hind  hips  green,  covered  with  white 
bloom  ;  feet  pitchy,  tawny  towards  the  l)ase  ;  wings  slightly  gray, 
indistinctly  tinged  with  brown  along  the  borders  of  the  veins ; 
wing-ribs  and  poisers  tawny;  veins  i)itchy.  Length  of  the  body 
2  lines  ;  of  the  wings  4  lines. 

a.  North  America.     Presented  by  the  Entomological  Club. 


APPF.NniX. 


317 


Page  GCC.     Dwlic'liopUH  Hoqiiax,  n.  s. 

ryanoo-viridis,  thonu'C  ii'iieo-viridi,  al)(loiuiiiis  apicc  u'lico,  aii- 
tciinis  fulvis,  articulo  tertin  iiiirro  s\il)tus  Culvo,  peclibus  fulvis,  tarsis 
iiifiris  aiitic'is  piceis,  alls  liinpidis. 

]Jo(ly  bluisli-grec'ii ;  lioail  covered  in  front  with  poldon  down  ; 
eyes  red;  ni(Mith  piteliy  ;  feelers  tawny;  tliird  Joint  black,  tawny 
l)eneath  towards  tlie  base;  bristle  black;  ciiest  with  a  sli<rht 
brassy  tinj^o ;  breast  covered  with  a  hoary  bloom;  a))domeii 
bluish-frreen ;  tip  bronzed ;  appenda^^es  tawny ;  scales  wliite, 
with  dark  borders,  under  side  slightly  covered  with  hoary  bloom  ; 
lejrs  tawny,  feet  black;  fonr  hind  liips  mostly  frrcen,  covered  with 
white  down  ;  middle  shanks  with  a  slijrht  tuft  of  black  hairs  at  the 
base  ;  fore  feet  pitchy,  tawny  at  the  base  ;  winjrs  colorless  ;  win<r- 
ribs  and  jjoisers  tawny  ;  veins  black.  Length  of  the  body  1  -j  line  ; 
of  the  wings  3  lines. 

a.  St.  ^Martin's  Falls,  Albany  River,  Hudson's  Bay.  Presented 
by  G.  IJarnston,  Kscj, 

Page  Wid.     Dolicliopus  SOCCatUS,  IUrnston's  MSS. 

vEnens,  capite  viridi,  abdomine  cnjjreo  basi  viridi,  antennis 
fulvis,  articulo  tertio  nigro  subtus  fulvo,  pedibus  fulvis,  tarsis 
nigris,  alls  sibcinereis. 

Head  green,  covered  in  front  with  hoary  down,  fringed  along 
the  eyes  with  whitish  hairs ;  eyes  red ;  mouth  tawny  ;  feelers 
tawny;  third  joint  black,  very  short,  tawny  beneath  till  near  the 
tip;  bristle  black;  chest  brassy ;  sides  and  breast  covered  with 
hoary  bloom ;  abdomen  coppery,  green  at  the  base  ;  legs  tawny  ; 
feet  black  ;  w;r.gr,  slightly  gray  ;  wing-ribs  tawny  ;  veins  black  ; 
jioisers  yellow.  Lengtl  of  the  body  IJ  line  ;  of  the  wings  3|- 
lines. 

Var.  j3.  Body  brassy,  tinged  with  green. 

a.  St.  ^fartin's  Kails,  Albany  Kiver,  Hudson's  Bay.  Presented 
by  G.  Barnston,  Ksq. 

Page  663.     Dolichopus  reiliotus,  n.  a. 

vEneo-viridis,  capite  thoracisrpie  lateribus  cyaneo-viridibus,  ab- 
domine basi  viridi,  antennis  nigris,  pedil>us  fulvis,  tibiis  posticis 
apice  tarsiscpic  postici.s  nigris,  alls  limpidis. 


urn 


11 


^1  ' 


mi 


ii: 


mi 


' 


318 


mPTKUA  r»p  NoiiTir  amkuipa. 


[I'AHT  M. 


llcnd  Iiliiisli-^rccii,  clotlicd  in  frmit  with  white  ilnwii  ;  friiijrcd 
nil  ciH'h  si(l(!  with  white  hairs;  eyes  red;  rcch'rs  hlack  ;  chest 
brassy  frreeii,  liliiish-frreen  (iii  each  side;  l»reast  envefcd  willi 
lioai'y  hlduiii  ;  alidonien  brassy,  jrreeii  at  tli(!  base,  tiiifred  witii 
j^reen  mi  each  si(h',  eovered  with  wldte  bioniii  Ix'iiealh  ;  tip  lihiik; 
appeiidafres  tawny  ;  scales  white,  burdei'ed  with  bhiek  ;  le^s 
lawny;  lips  of  feet  jiitcliy  ;  hind  feet  and  lips  of  hind  shanks 
lilaek  ;  wiiitrs  cdlorJess  ;  wini;-ribs  and  poisers  jude  tawny  ;  veins 
bhiek.     Lenu'th  of  the  liudy  I.',  line;   of  tlie  wind's  15  lines. 

a.   North  America.      Presented  by  llie  Kiiloni(doj>-ical  t'hil). 


j 

I 

pi 
f 

ii 


K' 


ii 


1 

I- 


Pago  (;il7.     Dolicliopiis  irrasiis,  s.  n.,  IVm. 

Cyaneus,  abihunine  u'lieo,  aiiteiinis  nigris,  pedibus  fnivis,  tarsi* 
pieois,  alis  cinereis  fnseo  snbvittatis. 

liody  deep  blue,  beset  with  blacK  hairs  and  bristles;  head 
eovered  in  front  with  a  silvery  l)l(M)ni  ;  eyes  red  ;  iiioitth  a!i(| 
feelers  black  ;  eliest  covered  with  fernijfinoiis  bloom  ;  sides  and 
chest  c<»vered  with  white  bloom  ;  abdomen  dark  bronze,  sli^rhtly 
covered  with  white  bloom,  not  lon<rer  than  tiie  chest  ;  le<>'s  tawny, 
clothed  with  l)lack  hairs  and  bristles;  feet  pitdiy  ;  winijs  jzray, 
lirownish  alon<r  the  borders  of  the  veins;  winjf-riljs  and  vciii» 
black;  fourth  loiifritudinal  vein  sliirlitly  bent;  poisers  dark  tawny. 
Len<j:tli  of  the  body  1  line  ;   of  the  winji-s  2  lines. 

a.   Florida.     Tresentod  by  E.  I)oul)leday,  Esq. 

Page  G()7.    Ortliocliile  derenipta,  n.  ». 

Yiridis,  thoracis  disco  cni>reo.  al>doniine  ])iirpnreo,  Itasi  apiceipie 
cyianco-viridi,  lateribus  aureo-viridilms,  antennis  nijrris.  i>e(iibu^ 
fnivis.  fenioribus  viridilms,  alis  siibcinr'ris. 

Body  trreeii  ;  head  and  chest  ix'set  with  black  bristles  ;  eyes 
and  mouth  black  ;  feelers  black  ;  third  joint  very  short,  round  ; 
bristle  proceeding:  from  its  tip  ;  disk  of  the  chest  copper-colored  ; 
abdomen  purple,  clothed  with  black  hairs,  blnish-n-reen  at  the 
base  and  at  the  tip,  jrolden-irreen  along  each  side;  legs  tawny, 
clothed  with  short  black  hairs;  hips  and  thighs  green;  wings 
slightly  gray  ;  wing-rilis  and  ]>oisers  tawny  ;  veins  pitchy.  Length 
of  the  body  1:^  line  ;  of  the  wings  3  lines. 

a    North  America.     Presented  by  the  Entomological  Club. 


AI'I'ENDIX. 


.'UO 


WulLrr,  in  (hr.   Transact  inn  a  nf  l/n;  Kntomoloijival  Hovichj, 

Tiun.ir. 

Page  149.    PsilopiiH  iiiiKiilivenn. 

.!/(/.«*. — Lii'to  viridis,  iintt'iiiiis  iii^:ris  llKtrucc  Icmj^ioriliiH,  lli(»riwt' 
siil)('yiiiu.'.>(<'iit<',  iiltddiiiine  sulmiinito,  pi'dihiis  tostiu'cis,  iilis  siil>- 
ciiicri'is,  vciiis  nijrris. 

Male.  —  IJrijrht  gi't'cii ;  nntomiiu  lilack,  iiiiich  loufjci*  tliaii  tlic 
thorax;  thorax  slightly  bluisli ;  ali(h)iii('ii  soiiicwiiat  gilded  ;  hgs 
testac'L'ous,  long,  shMidiT ;  wings  grayish;  veins  l)lack,  t'ori'-liriinch 
of  the  |»riubra('hia!  vein  very  much  IxMit,  nearly  rectangular ; 
discal  transverse  vein  very  dee}»ly  undulating.  Length  of  the 
body  4j,  lilies;   of  liie  wings  7  lines. 

L'nitcd  Slates. 


WulLcr,  in  the  'Transactions  of  the  Entomological  Society, 

Tovu  V. 

Pape  287.     l*HilO|iiiri  solidiis. 

F(rm. — Cyanoo-virldis,  robustus,  subtus  albido-toniontosus,  aii- 
tennis  pedibuscjuc  ingris,  abdoniiuis  lateribus  basi  cupreis,  alis 
subcinereis,  fasciis  duabus  (P  media  lata,  2*  apicali  latissima) 
uigris  antice  connexis,  halteril)us  testaceis. 

Female. — Bright  bluish-green,  stout,  with  whitish  tomcntuin 
beneath  ;  aiileiin;c  and  legs  black  ;  alxlomen  bright  cuiircoiis  du 
each  side  at  the  '  aso  ;  wings  slightly  grayish,  with  a  brnad  black 
band  in  the  middle  and  a  very  broad  apical  black  band,  the  two 
bands  connected  in  front ;  fore  branch  of  the  pra'ltrachial  vein 
almost  rectangular;  discal  transverse  vein  straight,  ol)li(|nc; 
inilteres  dull  testaceous.  Length  of  the  l)ody  8  lines;  (jf  the 
wings  7  lines. 

Mexico. 


I,. 


lit 
■)■(■ 


» 

1^ ., 

t  ■  . 

V   i  :v 


i^l! 


Page  2S7.     P»ilopiis  peractiis. 

F(em.  —  Viridis,  robustus,  snl)tns  alltido-tonicntosus,  cajiito 
cyaneo,  antonnis,  ))edibus  halteril)us(|ue  nigris,  abilomiiic  leiicd- 
viridi,  alis  subcinereis,  venis  nisris. 

Female. — Green,  stout,  with  whitish  tomcntuin  Iienciitli :  head 
blue;   antenine  and  legs  black;    abdomen  ivneous-grecn  ;    winj^s 


-.:.;-i! 


&JK, 


890 


i)Ti»TKiiA  OF  Nonrrr  amkuica. 


[I'AIIT  II. 


(rniyisli ;  veins  l)lack  ;  forc-brimcli  (if  the  i>nrl)nu'liiHl  vein  nhtuscly 
I'rctniiuiiliir ;  discul  truiisvrrsi'  vein  (tl)rK|iit>,  nliiiust  strui^lil  ;  lial- 
tercs  liliick.     Loiij^lh  of  tliu  liody  2^  lines  ;  of  tlio  wings  4  lines. 
Mexico. 

Page  287.    PMilopiiH  hopretlciiH. 

Frrm. — I'nr])nreo-niger,  latns,  nitens,  sultlns  alitido-toniontnsus, 
capite,  antennis  ju'diltiiscine  nigris,  ulnloniinu  iiigrieuiite  imrpureo, 
uiis  snlieinereis,  venis  nigris. 

Fcmah-. — I'nrplisli-lduek,  brond,  sliining,  willi  wiiitisli  tonien- 
tiini  beneath  ;  head,  antennie  and  legs  blaek,  the  latter  rather 
Htont ;  thora.x  rather  thickly  beset  with  blaek  l)rislles  ;  altdonnwi 
blaekish-j)urple ;  wings  slightly  grayish;  veins  blaek;  fore-branch 
of  the  pnebraehial  vein  rectantrnlar,  but  with  the  angle  somewhat 
ronnded  ;  diseal  transverse  vein  obli(jue,  nearly  straight.  Length 
of  the  body  1^  line ;  of  the  wings  3^  lines. 

Mexico. 

Page  288.    PsilopuH  pernio    'ciis. 

Moji. — Anreo-viridis,  gracillinins,  antei  e(libus(pio  flnves- 

ocnte  albis,  nlis  linipidis,  venis  hnlteribuscpie  pallidis. 

Male. — Golden-green,  very  slender ;  antennie  and  legs  yellowish- 
white;  wings  limpid;  veins  pale;  fore-branch  of  the  prtobrachial 
vein  obtusely  rectangular;  diseal  transverse  vein  oblique,  straight ; 
lialteres  very  i)ale.  Length  of  the  body  1 J  lino  ;  of  the  wings  4 
lines. 

Mexico. 


I  i- 


t^ 


SUrPLEMEXT 


TO  TlIK 


iw 


•Mi? 

;  I'.'t' 
;  iH 


MONOGRAPH  ON  NORTH  AMKRICAN  DOLICHOPODIDJ..' 


i  11. 


I,   General  liemai'li'ti  on  the  DolichopittUiJiv.  of  Xorlh  America. 

That  llin  Nortli  Anuricaii  thuiia  of  Jhilirhn/xxh'dfv  is  nii  vx- 
ceeiliiijrly  rich  one,  is  proved  l»y  tliat  jiortion  of  it  ii|tiin  wiiich  I 
liavo  l»a.s('(l  the  prc^int  jxiljlicatioii.  I  am  satisfied  that  this  fauna 
far  I'xct'od.s  tho  Kiiropoaii  fauiitt  in  tiu;  variety  of  forms  and  in 
the  number  of  species. 

1  take  tlie  following,'  points  to  be  peculiar  to  this  fauna  :  1.  Tho 
apparently  ratlior  numerous  species  of  l'c/(is/n)iei(riis;  2.  Tlie  re- 
nuirkahle  al)undance  of  closely  allied  species  of  true  (/i/mnopler- 
hkk;  3.  Tho  niunher  of  species  of  CIiri/Kotua  dislinjrnished  by  a 
variety  of  plastic  characters,  which  is  not  {renerally  the  ease  in 
this  genus;  4.  The  abundance  of  species  of  Diii/i/ionit^  and  (tf 
forms  related  to  this  jrcnus.  Our  kno\vled<re  of  the  <i'enera  occur- 
ring in  North  America  is  too  limited,  yet,  to  indicate  tho  alisoncc 
of  some  of  them  as  l)eing  peculiar  to  tin;  fauna. 

A  very  striking  circumstance  connecte(l  with  the  Xorth  Ameri- 
can fauna  of  Jhtlichopixlidie  is,  that  i)recisely  in  thost;  points 
which  we  have  just  enumerated  as  peculiar  to  it,  this  fauna  shows 
the  most  remarkable  analogy  to  the  remains  of  the  fossil  fauna  of 
the  same  family  ])reserved  in  amber.  In  both,  there  is  the  sanu; 
abundance  of  species  of  genuine  (runmoplernus,  dillicult  to  dis- 


'  The  volume  had  already  gone  through  tlie  press  when  the  present  sup- 
plement '.vas  sent  in  hy  Mr.  Loew.  It  contains  destriptions  of  the  new 
species  discovered  mostly  by  me  during  the  smiimer  18(j;5.  The  (li'ueial 
/{(iwirl-s,  prefixed  to  this  Supplement,  form  an  important  addition  to  tho 
preface  of  this  volume  (page  iii — vi).  0.  S. 

21  (  321  ) 


j-fe^lj: 


in 
I 


i'  : 
■    ^ 


■  P- 


'■■III 


322 


DIPTEUA  OF  NORTH  AMEUICA. 


[part  it. 


tin<j:iiish  on  account  of  their  dose  resemblance;  in  l)0tli,  the  same 
frecjiK'nco  of  si)ecie,s  of  Chri/soliis,  and  not  only  the  same  variety 
of  plastic  Pi)eciric  charaeterri  anH»n<;  ihem,  but  even  a  most  strik- 
in<r  conformity  in  the  i^ature  of  these  characters;  in  both,  nume- 
rous species  of  Diaphoruti  aiul  of  forms  related  to  them.  A  cer- 
tain coincidence  is  even  perceptibk  among  those  genera,  whieli 
hitherto  are  not  represented  either  in  the  North  American  or  in 
the  amber-fauna.  It  must  be  added,  however,  tliat  the  latter 
shows  nothing  like  the  great  abundance  of  the  North  American 
fauna  in  si)ecies  of  genuine  Dolichoput^. 

It  would  be  dillicult  at  jjresent  to  make  any  satisfactory  state- 
ment as  to  the  relation  in  which  the  North  Auicrican  fauna  of 
JJolichopodithi;  stands  to  that  of  any^other  zoological  i)rovince,  as, 
with  the  exception  of  the  Euroi)ean  fauna,  our  knowledge  if  other 
faunas  is  not  sullicient  for  this  ])nrpose.  Yvom  what  we  know, 
however,  w(>  distinctly  perceive  that  the  North  American  fauna 
closely  approacln's  the  Kuropean  and  the  North  Asiatic  fauna}  in 
the  si)ecies  of  the  genera  Ifi/grorcleidhun,  DoIicJinjiKu,  T(i<-h;/lir- 
rhiix,  Cnnipsirncmu.t,  Scdlns,  Jli/draphorux,  Ltanraluft,  CIii'i/sdH- 
7/)«.s,  1  id  X<nit/iochlo7'i(K,  whereas  its  coalescence  with  the  South 
Anieri  an  fauna  is  apparent  in  the  sjjecies  of  Pa)'arli)(!t,  rddntn- 
vcurnyt,  Li/roncHrttft,  and  Fl(i'jiiniriiru)^.  The  species  of  genuine 
Gi/mnoj^tcrnu.'^,  so  numerous  in  North  America,  are  l>ut  scantily 
represented  in  Europe.  The  North  American  species  of  DiapJio- 
riiK  agree  in  i)art  with  the  Euroi>can,  in  part  with  the  South 
American  species.  The  North  American  species  of  Argi/ra,  {'or- 
pJii/roiis,  Leucoxtido,  and  Lioncalus  do  not  show  any  striking 
dillerence  from  the  European  species  of  these  genera,  but  juft  as 
little  from  the  South  American  species. 

Of  such  species,  as  are  connnon  to  Europe  and  North  America, 
the  following  have  hitherto  conu;  uiuler  my  observation  :  ])nli- 
<'hnpiis  brcripr)))i/.-i  Meig.,  D()licJiO])iif<  jdioiiipefi  Scop.,  DoJiclu)- 
puH  (liscifcr  Stann.,  ^Sc(7/»x  xjjiiiiinamis  Zett.,  and  I'Kilojnm 
pnllcns  "\Vicd.  The  first  four  of  these  species  belong  altogetlicr 
to  specifu'  types  commonly  represented  on  Itoth  continents;  but 
this  is  not  the  case  with  PsilopiiK  ;)f///c».s.  This  species  un(|Ut's- 
tionably  Ix'longs  to  the  circle  of  European  ty})es  of  Psi!i)pu.<, 
whereas  all  the  North  American  l\-<iIopu!<  at  i)rescnt  known 
closely  approach  tin;  types  of  their  South  American  brethren.  It 
seems,  therefore,  not  altogether  unnatural  to  suppose  that  thin 


SIPPLKMKXT. 


32; 


spocios,  wliif'li,  aoconlinu,'  ti>  JJiiroii  Osten  SackcMi's  statoniont,  is 
not  unconiiiion  in  the  lower  jkuMs  of  New  York  City,  should  liavc 
been  accidentally  ini}>oi'tcd  in  siiips  from  tlie  south  of  Europe. 
As  species  coninion  to  both  continents  may  perhai)s  be  also  re- 
liiirded  Pidjtlioriia  niijrivona  ^lei,<r.  and  Xtnit/ioc/ilorus  li'urlhis 
Wied. ;  the  North  American  Diiiplidnix  o/i(irti.-<  niijrht  be  con- 
sidered as  identical  with  the  first,  XantJiochldnis  /icln'ntis  with 
the  second  of  these  species;  certainty  about  this  point,  liowever, 
can  <.:dy  be  accpiired  by  the  dose  comparison  of  a  larjrer  number 
of  V  ell-preserved  spoeimous  of  the  two  American  species. 

II.  Description  of  mmc  Species  communicole.d  after  the  J'ulitnie 
had  fjonc  thriHujli  the  Prexx. 

Gen.  II.  DOMC  IIOI'I.  N. 

Corrected  Table  j'tiv  dcU  rminiixj  tlic  Species, 
f  Prevailing  color  of  the  feet  black.  2 


t  Prevailing  color  of  the  feet  yellow, 
f  Cilia  of  the  inferior  orbit  black. 


"1  Cilia  of  the  inferior  orbit  whitish. 
,,  f  Face  ochre-yellow. 
I  Face  silvery  white. 


9 

3 
4 


1  gratiis  f.ir, 
ry  whue.  2  laticornis  /.w. 

.  f  First  ioint  of  the  hind  tarsi  with  nnmerons  bristles.       ?>  setifer  /.»'. 
4  s 

t  First  joint  of  the  hind  tarsi  with  a  few  bristles.  5 

,  f  Hind  tibi;c  black  onl  v     t  the  tip,  0 

\  Hind  tibia)  entirely  black.  7 

f  The  black  color  at  the  tip  of  the  hind  tibia>  is  rati  er  oxtendeil  njid 
1  not  very  sharply  limited.  4  albiciliatus  /.»•. 

j  The  black  color  at  the  tip  of  the  hind  tibia)  bnt  little  extended  atid 
sharply  limited.  5  xanthocnemua  n.  sp. 

„  f  A  considerable  extent  of  the  tip  of  the  femora  yellow,  (i  tetricus  n.  sp. 
t  The  extreme  tip  of  the  femora  only  somewhat  yellowish.  8 


„  f  Lamella)  of  the  hypopygium  pointed. 

I.  Lamellic  of  the  hypopygium  rounded  ovate. 
„  j  Cilia  of  the  inferior  orbit  black, 
t  Cilia  of  tht!  inferior  orbit  j- lie. 
,,.  f  Fore  coxa)  blaidcisli. 

'  Fore  cos.x'  yellow. 
,,  f  The  first  two  joints  of  the  antenn-e  yellow. 

'  'i'he  whole  antenna)  black. 
,(,  f  Tecnlic  with  pah^  cilia. 
"  t  Tegulie  with  black  cilia. 


7  acuminatus  r.w, 
i-  ovatus  /.((•. 

10 

12 

0  pachycnemuB  f.ir. 

11 

4:?  dorycerus  f.ir. 
10  brevipenuis  .lA  /</. 

13 
2({ 


nm  m 


:ii;i!i 


ill 


i  ■  4 


t  i^ 


nm 


hit 


,  ;  ■  1' 


r  ■ 


1 

1  ; 

1 

1 ': 

1 

i 

„,_ 

324 


DIPTERA  OF  NORTH  AMERICA. 


[part  ir. 


,Q  f  Antennc-B  black,  at  the  utmost  tho  first  joint  almost  yellowish-red.  14 
I  Antennte,  altogether  or  at  least  their  larger  portion,  yellowish-red.  24 

■,,  f  Fore  coxflB  dark  at  the  base,  beyond  the  middle.  11  longimanuB  f.w. 
I  Fore  coxae  pale.  15 

,,  /  Tip  of  the  hind  tibire  distinctly  black.  16 

I  Tip  of  the  hind  tibiae  not,  or  very  slightly  infuscatcd.  17 

,„  /  Fore  tarsi  only  ferruginous-brownish.  12  brevimanus  f-w. 

«■  Fore  tarsi  blackened  from  the  tip  of  the  first  joint.       13  socius  I^w. 

.._  f  Hind  tarsi  entirely  black.  18 

I  Basis  of  the  hind  tarsi  to  a  considerable  extent  pale.  22 

f  Hind  femora  of  the  male  not  ciliated.  14  nudus  Lm. 


IS 


19 


I  Hind  femora  of  the  male  ciliated. 


19 


The  enlarged  last  joint  of  the  fore  tarsi  of  the  male  on  the  outside 
with  a  white  reflection.  45  palaestricus  Lw. 

The  enlarged  last  joint  of  the  fore  tarsi  of  the  male  on  the  outside 
without  a  white  reflection.  20 


16  splendidus  Lw. 

21 


21^ 


nr.  t  Hind  femora  of  the  male  very  densely  ciliated. 
t  Hind  femora  of  the  male  sparsely  ciliated. 

•Hind  tibiae  not  infuscated  at  the  tip ;  the  fourth  joint  of  the  fore  tarsi 
of  the  male  somewhat  broader  than  the  preceding. 

44  splendidulus  Liv. 
Hind  tibiae  somewhat  infuscated  at  the  tip;  the  4th  joint  of  the  fore 
tarsi  of  the  male  not  broader  than  the  preceding. 

If)  siibciliatus  Lw. 

f  Only  the  last  joint  of  the  fore  tarsi  of  the  male  enlarged. 

•22  J  17  batillifer /.«'. 

\-  The  two  last  joints  of  the  fore  tarsi  of  the  male  enlarged.  23 

no  (  Hind  femora  of  the  male  ciliated.  18  eudactylus  Lw. 

IS)  tonsuB  Lw. 

20  teuer  L.w. 

25 

2i  variabilis  Lm. 
22  luteipeunis  Ljr. 

27 
31 

23  ramifer  Iau. 
28 


(  Hind  femora  of  the  male  not  ciliated. 

o ,  (  Last  joint  of  the  fore  tarsi  of  the  male  enlarged. 
(  Fore  tarsi  of  the  male  plain. 

25  (  Wings  hyaline  with  a  grayish  tinge. 
*  Wings  hyaline  with  a  yellowish  tinge. 

{ 

27 1 


2,.  }  Fourth  longitudinal  vein  broken. 


28. 


29 


Fourth  longitudinal  vein  not  broken. 

Antennae  black. 

Anteiniae  yellowish  red. 

Fourth  longitudinal  vein  broken  twice  at  right  angles. 

24  bifractus  Lav. 

The  lower  angle  of  the  fourth  longitudinal  veiu  sharp,  the  upper  one 

roumled.  2!) 

(  Tarsi  of  the  male  i)lain.  25  vittatus  L.w. 

\  Fore  tarsi  of  the  male  enlarged  at  the  tip.  30 


SUPPLEMENT. 


325 


30 


31 


Hind  femorn,  of  the  male  cilLated.  2G  cuprinua  M'ivd. 

Hind  femora  of  the  male  not  ciliatefl.  27  longipennis  /.»■. 

Antennae  red,  at  the  utmost  the  third  joint  at  the  tip,  or  its  hirger 
portion,  blackened.  32 

I  Antenn.'c  black,  at  the  utmost  the  first  joint,  in  part,  red.  39 

„(,  f  Humeral  callosity  of  the  same  color  as  the  dorsum  of  the  thorax.    33 
(  Humeral  callosity  yellowish.  3S 

Arista  of  the  antenna?  of  the  male  very  much  enlarged  ;it  the  tip. 

28  hastatus  f^w. 
the  antennre  of  the  m.ale  plain.  34 

Last  joint  of  the  fore  tarsi  of  the  male  not  enlarged.  35 

joint  of  the  fore  tar.si  of  the  male  enlarged.  3G 

First  joint  of  the  middle  tarsi  of  the  male  feathered. 

2!)  plumipes  Scoji. 
'  First  joint  of  the  middle  tarsi  of  the  male  not  feathered. 

3(1  fulvipes  J'W. 

("Last  joint  of  the  fore  tarsi  of  the  male  with  a  lamelliform  appendage. 
I  31  sezarticulatus  Lw. 

op    I 

}  Last  joint  of  the  fore  tarsi  of  the  male  without  lamelliform  appendage. 


33 


34 


/  Arista  of 

V  Arista  of 

(  Last  joii 
(  Last  joii 

I' 
1' 


L 


37 


38 


39 


Last  joint  of  the  fore  tarsi  of  the  male  small. 

Last  joint  of  the  fore  tarsi  of  the  male  large. 
(  Fore  tarsi  of  the  male  plain. 
I  Fore  tarsi  of  the  male  enlarged  at  the  tip. 
(  Antenna)  entirely  black. 
\  Firs 


37 

32  ruficornis  /-»•. 
4(1  lobatus  /-v. 

33  Bcapularis  /.»•. 
34  funditor  A»'. 


40 
43 

41 
42 

35  chrysostomus  f.u;. 
4(i  melanocerus  Lw. 


irst  joint  of  the  antennce  partly  red 
.«  (  Hind  femora  not  blackened  at  the  tip. 
(  Hind  femora  blackened  at  the  tip. 

•  ^  (  Hind  tibiae  not  blackened  at  the  tip. 
I  Hind  tibite  blackened  at  the  tip. 

'  Anterior  femora  without  dark  streaks  on  the  under  side. 

37  comatUB  Lw, 
Anterior  femora  with  dark  streaks  on  the  under  side. 

3G  prseustus  Lie. 

{First  joint  of  the  hind  tarsi  yellow,  with  the  exception  of  the  tip.    44 
First  joint  of  the  hind  tarsi  entirely  black.  45 

'Lamellte  of  the  hypopygium  ochreous-yellow,  not  double. 

38  Bcopariua  Lir. 
Lamellae  of  the  hypopygium  ochreous  yellow,  double,  tliat  is,  having 
an  inner  pair  of  fiabs  besides  the  outer  ones. 

47  quadrilameUatus  Lu: 

f  Tips  of  the  hind  tibiae  at  the  utmost  somewhat  blackened  on  the  in- 

45 1  side.  4A 

I  Tips  of  the  hind  tibiae  distinctly  black.  47 


42 


43 


44-^ 


ilf 

^ 

S"        j^^ 

■„i  '■ 

■:      S. 


i  ;? 


'■W-liu.^ 


I< 


I* 

It  i' 


I, 


32G 


DIPTERA  OF  NORTH  AMERICA. 


[part  II. 


("The  first  joint  of  the  antennae  red  on  the  under  side  only. 

3!)  discifer  Lw. 
[  The  first  joint  of  the  antenna}  red,  witli  the  exception  of  its  upper 
^         side.  40  lobatus  Lw. 

'  Ilind  tibioD  of  the  male  with  bristles  of  unusual  length. 

41  setoBus  Lw, 
Hind  tibite  of  the  male  with  bristles  of  ordinary  length. 

4*2  incisuralis  L.w. 


47^ 


43.  D.  dorycerus  Loew.  %  . — ^Tilneo-viridis,  oculorura  tegularuraque 
ciliis  nigris,  priniis  duobus  antennarum  articulis,  coxis  anticis  pedi- 
busque  saturate  flavis. 

% .  Sets,  antennarum  lamellifera,  tarsorum  anticorum  articulis  ultimis 
quatuor  dilatatis,  atris. 

? 

Metallic  green  ;  cilia  of  the  posterior  orbit  and  of  the  tegulje  black ;  the 
first  two  joints  of  the  antenna?,  the  fore  coxae  and  the  feet  saturate-yellow. 

'J, .  Arista  expanded  into  a  lamella  at  the  end,  the  last  four  joints  of  the 
fore  tarsi  enlarged,  deep  black. 

9 

Long.  Corp.  0.26.     Long.  al.  0.26. 

Syn.  Dolichopus  dort/cerus  Loew,  Berl.  Ent»  Zeltschr.  VIII,  93,  85. 

Male.  Bright,  bronzc-grecn,  usually  with  extensive  coppery- 
rod  reflections.  Antenna;  small ;  the  first  and  second  joints, 
which  are  very  much  obliterated,  of  a  saturate-yellow  color ;  the 
third  joint,  which  is  round,  and  the  arista,  black ;  the  latter  bears 
at  its  tip  an  elliptical  black  lamella.  The  face  more  ochre-brown 
than  ochre-yellow ;  the  cilia  on  the  posterior  orbit  altogether 
black.  Hypopygium  black  ;  the  lamellos  of  middling  size,  dingy 
white  with  a  rather  broad  black  margin,  jagged  on  tlie  edge  and 
beset  with  black  bristles,  on  the  upper  margin  with  black  hairs. 
Fore  coxa)  with  black  hairs.  Feet  saturate-yellow ;  hind  femora 
before  the  tip  usually  with  two,  sometimes  with  one  l)ristle ;  the 
hind  tibiie  have  upon  their  hind  side,  before  the  middle,  a  small 
brown  callus,  and  are  blackened  at  the  extreme  tip  on  the  Inaide- 
Fore  tarsi  about  as  long  as  the  tibia) ;  the  first  joint  slender,  stalk- 
like, considerably  longer  than  the  following  four  joints  together, 
dark  yellow,  blackened  only  at  the  extreme  tip ;  the  following 


Sll'PLEMKNT. 


327 


four  joints  vclvot-hlark,  strongly  coinprcssod  from  tlic  sides ;  the 
three  hist  ones  are  expanih'd  on  liie  u}>i»er  side  into  long  lobes, 
which  are  velvet-ltlack  on  tin;  third  and  fourth  joints;  on  the 
liftl.  joint  tlio  lolte  is  hlaek  only  at  the  baso,  otherwise*  whitish. 
JSIiddle  and  hind  tarsi,  from  tho  tip  of  the  lirst  joint,  )j!avk. 
"Wings  grayish-hyaline  with  dark-hrown  veins,  tinged  with  elay- 
ish-yellow  ii!  the  costal,  marginal,  and  sul)n)arginal  cells,  the 
C(jsta  only  slightly  iiicra>sated  at  the  tip  of  the  lirst  longitudinal 
vein;  the  tip  of  the  third  longitudinal  vein  strongly  ilellected 
backwards ;  the  last  segment  of  the  fourth  longitudinal  vein  not 
broken  ;  the  posterior  margin  of  th(!  wing  has  a  deep  sinus  before 
the  unusually  }»rotruding  anal  angle  ;  the  latter  is  again  siuiuited, 
so  as  to  api)ear  bilolx-d. 

Ildh.  Glen-llouse,  White  Mouutaius,  New  Hampshire,  July 
2,  1803.     (Osteu-Sacken.) 

44.  D.  spleildiflullis  Loew.  %.  —  Viridis,  nitidus,  coxis  anticis 
pediliuscjue  flavis,  tibiis  postiuis  totis  concolorihus,  iintcnnis  tarsisijue 
postieis  iiigris,  ciliia  ouuloiuin  iiiferioiibus  tegiilarimniue  ciliis  ttavi- 
caiitibus,  alarum  vena  Inni^itudinali  quarta  noii  fiacta. 

^.  Tarsis  aiitii'is  eloiitratis,  articulo  quarto  pra;ceilentil)us  latiore,  quinto 
compr«sso  atro,  femoribus  postieis  minus  coiifertim  tlavo-ciliatis. 

9 

Green,  shining,  fore  coxhb  and  feet  yellow  ;  the  hind  tibire  not  hhickened 

at  the  tip ;  antennjo  and  hind  tarsi  black  ;  cilia  of  the  inferior  orbit  and 

of  the  tegulfe  yellowisli. 
%.  Fore  tarsi  elongated,  fourth  joint  broader  than  the  preceding;    the 

fifth  joint  laterally  compressed,  black  ;  hind  femora  ciliated  with  rather 

sparse  yellowish  hairs. 

9 

Long.  Corp.  0.22.     Long.  al.  0.22-0.23. 

Syx.  Ihlichiqnts  splfinlidulus  LoEW,  Berl.  Ent.  Zeitschr.  VIII,  91,  82. 

JFdJe.  Metallic  green,  bright,  shining.  Face  rather  bright- 
yellow.  Anteiui!T2  altogethir  black ;  the  third  joint  short-ovate. 
Front  shining  green.  Cilia  of  the  inferior  orbit  pale-yellowish. 
Lanii'ilu'  of  the  hypopygium  broad,  ovate,  whitish  ;  on  the  upper 
and  the  apical  nmrgins  with  a  very  narrow  blackish  border;  ajjical 
margin  jagged  and  beset  with  bhick  Ijristlc.  The  four  hind  coxai 
are  l)hickish,  only  at  the  extreme  tip  yellow.  Fore  coxa'  yellow, 
somewhat  blackened  oidy  at  the  extreme  basis,  beset  with  short 


^  rn' 


m 


'  'mi' 


328 


DIPTERA  OF  NUUTII  AMEIIICA. 


[PAIIT  II. 


■■>''y\ 


Nlii 


black  littlo  hairs  almost  upon  the  whole  front  side.  Poet  yellow. 
The  hind  feinora  Ix-fore  the  tip  wi  h  a  hristle,  upon  the  greater 
part  of  'h(^  under  side  sparsely  ciliated  with  ratlua*  l<»ng  yellowish 
hairs.  Hind  tibise  of  ordinary  strength,  not  infuscated  at  the 
tii>,  with  a  long  glaln'ous  streak  upon  the  hind  side.  Fore  tarsi 
abundantly  one  and  a  half  the  length  of  the  tibioc ;  the  first  four 
joints  yellow,  on  the  inside  with  a  somewhat  whitish  reflection ; 
stalk-shaped  from  the  firht  to  the  third  joint ;  the  fourth  joint  late- 
rally comi)ressed,  somewhat  broader  than  the  preceding,  especially 
towards  the  tip ;  the  first  joint  nearly  as  long  as  the  three  follow- 
ing together;  the  fifth  joint  black,  compressed,  broad,  especially 
towards  the  tip,  beset  on  the  upper  side  with  closely  appressed 
little  hairs.  ^Middle  ta...-i  ulackened  from  the  tip  of  the  first  joint. 
Hind  tarsi  altogether  black.  Cilia  of  the  teguhe  whitish.  "Wings 
hyaline,  somewhat  grayish,  of  rather  uniform  breadth  ;  the  costa 
at  the  i\\)  of  the  first  longitiulinal  vein  with  a  weak  and  very 
short  swelling;  the  fourth  longitudinal  vein  not  broken. 

Hab.  "Wl.lte  ^Mountains,  New  Hampshire,  July,  18G3.  (Osten- 
Sacken.) 

Observation. — This  species  has  an  extraordinary  resemblance 
with  D.  sploididtis  on  one  side,  and  with  D.  sitbciliatus  on  the 
other.  It  diflers  from  D.  sj^Ioididiis,  with  which  it  agrees  more 
with  regard  to  the  structure  of  the  fore  tarsi,  by  the  less  densely 
ciliated  hind  femora,  and  by  the  smaller  extent  of  the  incrassa- 
tion  of  the  costa.  I),  sitbriliatiis  has  longer  and  more  slender 
fore  tarsi,  the  fourth  joint  of  which  is  as  slender  as  the  preceding  ; 
it  has  the  hind  ti))iic  infuscated  at  the  tip ;  the  cilia  of  its  hind 
femora  are  not  oidy  more  scarce  but  also  shorter,  finally  the  swell- 
ing of  the  costa  is  more  extended.  ^loreover,  not  only  D.  splendi- 
dus,  but  also  J),  subciliatus  are  considerably  larger  than  D.  splcn- 
dididus.  This  character  will  enable  us  to  distinguish  the  female 
of  D.  ftpleiididulus  from  that  of  D.  splcndidus,  as  well  as  from 
the  female  of  D.  suJiciliotus ;  the  two  latter,  however,  cannot  be 
confounded  on  account  of  the  diiferent  color  of  the  hind  tibitc. 


V 


45.  D.  palacstricus  Lokw.  %  and  9, — iEneo-viridis,pedihus  flavis, 
coxis  anticis  tibiiscjue  postieis  totis  concoloribus,  antennis  tarsisque 
posticis  nigris,  cilii.s  oculorum  inferiorilms  tegularumque  ciliis  flavi- 
cantibus,  vonA  alarum  longitudinali  quarts,  iion  fractil. 

^ .  Ultimo  tarsorum  anticorum  articulo  admodum  dllatato,  nigro,  in  latere 


SUPPLEMKN'T. 


r>29 


externo  aUio-micante ;    femorum   posticorum   cilils   llavicantibus,   iion 
conffi'tis. 
9 .  I'tHlilius  simplicibus. 

Metallic  green;  feet  yellow;  foro  coxjp  ami  the  ■whole  hind  tihi.T  of  the 
same  color;  antenna)  and  hind  tarsi  black  ;  cilia  of  the  interior  orbit  and 
of  the  tegulje  yellowish ;  the  fourth  longitudinal  vein  not  l)roken. 

"J,.  The  last  joint  of  the  fore  tarsi  very  much  enliuged,  black,  on  the  out- 
side with  a  white  rellectiou ;  the  yellowish  cilia  of  the  hind  femora 
sparse. 

9 .  Fe(>t  plain. 

Long.  corp.  0.24.     Long.  al.  0.23. 

Syn.  Dolichojius  palwstrlcHS  Lof.w,  Berl.  Entora.  Zeitschr.  VIII,  02,  84. 

Metallic  preen,  bright.  Face  of  the  male  narrow,  more  pale 
ochre-yellowisli  than  fjcolden-ycllow ;  the  faee  of  the  fcnnile  hroader 
and  paler.  Antennie  entirely  bhiek  ;  the  third  joint  of  the  nip'e 
ovate,  that  of  the  female  shorter.  Front  green,  bright.  Cilia  of 
the  inferior  orbit  yellowish.  Fore  co.xa)  yellow,  on  the  front 
side  with  a  .short  blaek  pubescence.  The  four  posterior  eoxte 
yellow  only  at  the  extreme  tip.  Hind  femora  with  a  bristle  before 
the  tip.  Fore  tarsi  of  the  female  and  middle  tarsi  in  bntli  sexes 
blaekeni'd  from  the  tip  of  the  first  joint.  Hind  tarsi  black,  ex- 
cepting ot.' '  the  extreme  basis,  which  is  yellowish-brown.  Cilia 
of  the  teguhe  yellowish.  Wings  grayish  hyaline ;  fourth  longi- 
tudinal vein  not  broken. 

3rale.  Lamella;  of  the  hypopygiuni  whitish,  of  moderato  size 
and  oval  form ;  on  the  upper  and  apical  margin  they  have;  a  nar- 
row black  border,  the  latter  is  jagged  and  beset  with  black 
bristl  .'S.  Ilind  femora  sparsely  ciliated  with  yellow  hairs.  Fore 
iarsl  )nce  and  a  half  so  long  as  the  tibia> ;  the  first  four  juints 
yello-'V',  with  a  white  reflection  on  their  sides,  slender,  stalk-like; 
the  first  joint  as  long  as  (he  three  following  together,  Ihe  second 
abundantly  one  and  a  half  so  long  as  the  third  ;  the  third  some- 
what broader  than  the  preceding,  os])ecially  toward  its  tip ;  the 
fourth  considerably  shorter  and  broach-r  tiian  the  third  ;  the  fifth 
joint  laterally  compressed,  very  much  eidarged,  black,  with  a  silky 
reflection  ;  on  the  outside  this  refle<'tion  sometimes  appears  almost 
silvery.  Hind  tibiic  somewhat  thickened  ;  the  two  thirds  of  their 
hind  side  without  any  iiubescence.  The  costa  at  the  tip  of  the 
first  longitudinal  vein  with  a  rather  ehmgated  swelling. 

Hah.  New  Hampshire.     (Osten-Sacken.) 


;;:-:i :  bit 


« ■  ( 

1  .    "i 

i 

f.  -n 


Ik  k  I. 


Wb'  ^ 

1  flU 

Hii' 

^^H> : 

^1^9 

HB^  '' 

m 

^^B* ' 

330 


DIPTEBA  OP  NORTH  AMERICA. 


[part  ir. 


Ohxcrrnliftn  1. — J>.  pal nslricu s 'lAVL'ry  much  ]'\h^  T>.  hnlilli/fr. 
It  ilill'tTS  from  it  in  holli  i-cxcs  by  the  sniiicwlmt  lurjiiT  iiiitciiiia', 
and  |»riii<'ii»ally  by  the  liiml  tarsi,  wliicli  arc  liliM-k  as  far  iis  tlie 
extrcmo  l»asis;  inorcnvcr  the  iniilc  has  distiiictly  sliortcr  lure  tarsi 
and  tlicir  (irst  three  jctiiits  are  somewhat  stouter  ;  tiie  eilia  of  tho 
hind  femora  ar((  more  scarce ;  the  liind  til)iie  are  less  thickened, 
and  tiie  }i-laltrous  spot  on  their  hind  side  is  loiifi-cr.  Tlio  femah; 
may  he  distinjfuislied  from  the  soniewiiat  uncertain  female  of  J). 
splcndiihiti,  and  from  tlie  as  yet  nnknown  female  of  7).  xplciuliiln- 
lus  l»y  the  ))ul)escence  on  the  sides  of  the  abdomen,  winch  is,  to 
a  greater  extent,  of  a  i)ale  color;  from  tlie  female  of  I>.  nu(liii<  it 
dillers  \)y  the  under  side  of  the  lirst  joint  of  the  antenmu  not 
bein^f  red. 

Ohscn'dtion  2. — The  discovery  of  the  present  species  makes  it 
necessary  to  mention,  in  the  diaj^nosis  of  J).  bulUlifcr,  the  pale 
color  of  the  first  joint  of  the  Innd  tarsi,  and  the  very  dense  Iringe 
of  cilia  on  the  hind  femora  of  the  male. 

46.  D.  melanoceriis  Loew.  %  .and  5.  —  iEneo-viridis,  .antennis 
iiigris,  int'erioribus  ouuloruin  ciliis  Havicantibus,  ciliis  tt'gularuin  iiigris, 
coxi.s  aiuicid  pedibusqiie  thivis,  tarsis  anterioribus  inde  ab  articuli  priuii 
apice,  til)iaruiQ  posticarum  apioe  tarsisciue  posticis  totis  nigris. 

%  .  Fai-ie  subaurei,  tarsis  simplicibus,  femoribus  posticis  tlavo-oiliatis. 

$  .  Facie  albieante,  femoribus  posticis  non  ciliatis. 

Metallic  green  ;  antennoe  black  ;  cilia  of  the  inferior  orbit  yellowish  ;  cilia 
of  the  tegula?  black ;.  fore  coxte  and  feet  yellow  ;  the  four  anterior  tarsi, 
from  the  tip  of  the  first  joint,  the  tip  of  the  hind  femora  and  the  whole 
hind  tarsi  black. 

%  .  Face  almost  golden-yellow  ;  hind  femora  with  yellowish  cilia. 

9  .  Face  whitish  ;  hind  femora  not  ciliated. 

Long.  corp.  0.20.     Long.  al.  0.20. 

Syx.  Ihlichopus  melunocerus  LoEW,  Berl.  Ent.  Zeitsch.  VIII,  93,  86. 

Male.  Metallic  green,  bright.  Front  l)right  green.  Antennaj 
entirely  black,  rather  large ;  the  tliird  joint  elongated-ovate, 
rather  of  equal  breadth.  Face  rather  narrow,  golden-yellowish, 
but  not  shining.  Cilia  of  the  inferior  orbit  yellowish.  Lamelhc 
of  the  hypopygium  of  medium  size,  ovate,  whitish,  with  a  narrow 
black  border,  jagged  on  the  ai)ical  margin  and  bi'set  with  black 
bristles.  Fore  eoxie  yellow,  somewhat  blackened  at  the  extreme 
basis,  and  clothed  on  the  front  side  with  a  black  i)ubescence. 
Feet  yellow  ;  hind  femora  before  the  tip  with  a  bristle,  ciliated  on 


BVI'VLEMENT. 


331 


llie  uiulor  side  with  scattered  ycllowi.sli  liairs.  lliiul  tibiie  at  tlie 
til»,  to  a  eonsidenihlc  extent,  blnek ;  on  the  liind  side  with  a  jrhi- 
hioiis  strealv,  wiiieh  reaches  from  tlie  basis  iij)  to  tlie  tip.  Fore 
and  niiihlle  tarsi  blaclvened  from  the  tip  of  tlie  lirst  joint;  hind 
tarsi  altoirether  Ijlaelc.  Cilia  of  the  tefZ'nliu  black.  AVinjrs  with  a 
rather  dark-gray  tinge,  and  with  black  veins  ;  the  costa  has,  at  the 
tip  of  the  first  longitudinal  vein,  a  very  short  knot-like  swelling; 
the  fourth  longitudinal  vein  i.s  not  broken. 

Feinalc.  Tlie  plastic  characters,  which  distinguish  the  male 
are  wanting  hero,  otherwise  it  resenililes  the  male  very  much. 
The  antennie  are  considerably  shorter  and  their  last  joint  is  much 
smaller.  The  face  is  very  much  broader,  grayisli-white,  with  but 
little  admixture  of  yellowish. 

JIab.  Canada.     (Couper.) 

Obtiermlion. — The  male  cannot  bo  mistaken  for  any  other 
species.  The  female  differs  from  that  of />.  comattin  l)y  its  more 
consi<leral)le  siz(^,  darker  wings,  and  the  absence  of  a  dark  tip  ou 
the  hind  femora.  It  cannot  be  mistaken  for  the  as  yet  unknown 
female  of  I).  cJu'i/sotilomas,  on  account  of  the  extended  black 
color  of  the  tip  of  its  hind  tiliitc.  All  the  other  species,  with  the 
females  of  which  it  could  be  confounded,  have  the  anteii  iie  not 
entirely  black. 


*i; 


if 

w 


1  {kH- 


4^.  D.  qiiadrilamellatllS  Lofv,.  %  and  9.— Viridis,  nitcMis,  aii- 
tennis  nigris,  margiiie  infero  articuli  primi  rufescente,  facie  albil,  iiiferi- 
oribus  oculornm  ciliis  albidis,  ciliis  tegulariim  nigris,  coxis  aiiticis 
pedibusque  flavis,  tarsia  posterioribus  inde  ab  articuli  primi  apico  nigris, 
alarum  vena  longitudinali  quarta  non  fractA. 

%  .  Duobus  ultimis  tarsorura  anticorum  articulia  depressis,  atris  ;  lam«llia 
hypopygii  ochraceis,  bilobis. 

9  .  Tarsis  anticis  inde  ab  articuli  primi  apice  nigris. 

Gree  ,  shin'ng;  antennje  black  ;  the  inferior  margin  of  the  first  joint  ved. 
dish;  face  Thite  ■  the  cilia  of  the  inferior  orbit  whitish;  cilin  of  the 
tegul^  bla'j': ;  fore  coxte  and  feet  yellow,  the  four  posterior  tarsi  from 
the  tip  of  the  first  joint  black  ;  the  fourth  longitudinal  vein  not  broken. 

%  .  The  two  last  joints  of  the  fore  tarsi  flattened,  black ;  lamelloe  of  the 
hypopygium  ochre-yellow,  bilol)ed. 

9  .  Fore  tarsi  from  the  tip  of  the  first  joint  black. 

Long.  Corp.  0.27.     Long.  al.  0.2i). 

Syn.  DoUchopus  quadrilameUatus  Loew,  Berl.  Ent.  Zeitschr.  VIII,  D2,  83. 

Male.     ^Metallic  green,  shining.     Front  shining  green.     An- 
tennui  only  of  middle  size,  black,  the  inferior  edge  of  the  first 


m 


i- 


■i-'i 


i  k 


i; 


I: 


r. 


Dll'TKllA  OF  NORTH  AMKllICA. 


r 


I'AIJT  TT. 


joint  I'ctl,  which,  hctwt'vcr,  in  s<»nio  sj)('('im('iis,  cnn  1h;  iiincivctl 
(inly  ill  !i  ciirrriil  cxiiniiniitinn.  'I'hc  faci!  riilhiT  lij'nnd  lor  u  niiilc, 
wliilisli,  on  its  uppt'nnost,  i»iirt.  more  yt'Ilowisii-wliitc  Ciliii  of 
tlic  inlVrior  orUit  whitish.  Tlie  liiniflhi)  of  the  hypopyjriiini  arc 
(hiric  ochrc-yt'llow  and  with  two  llul)s,  so  that,  at,  a  siipcflicial 
frlancc,  the  hypopyjriuni  appears  to  liavc  fonr  lanicllii' ;  tiic  lonucr 
Hal)  has  n  narrow  hlack-hrown  liordcr,  is  not  Jau'jtd  at  all,  and 
beset  with  sonu'  delicate  ]»ale  liairs.  Fore  coxiu  yellow,  a  little 
l)laeluMie(l  at,  llie  extreme  basis  only,  on  tint  front  siile  with  a  line 
and  scattered  blackish  i)nl)escence.  Tin'  liiinl  coxie  yellow  at  tho 
extreme  tip  only.  Feet  yellow  ;  the  hind  femora  with  a  ])ristlc 
before  the  tip.  Fore  tarsi  not  cpiite  1/r  as  lon^  as  the  til)iie; 
their  first  three  joints  yellow,  stalk-like,  slender,  vapidly  decreas- 
ing ill  h'n,u;th  ;  the  first  joint  altoiit  as  lonu^  as  the  three  follow- 
ing toget'ier;  the  two  hist  joints  flattened,  black  and  covered 
witli  black  hair,  so  as  to  appear  rather  broad.  The  hind  side  of 
the  hind  tibia;  only  with  a  very  narrow  glabrous  streak  in  tho 
shape  of  a  line.  Middle  and  hind  tarsi  from  the  tip  of  the  first 
joint  black.  Cilia  of  the  teguhe  black.  ANMngs  grayisli-liyaline; 
the  costa  without  visible  swelling  at  tlio  tip  of  the  first  longitudinal 
vein;  the  fourth  longitudinal  vein  not  broken. 

Female.  Very  much  rescnil>ling  the  male.  Antcnnro  some- 
what shorter.  Face  broader,  whitish,  not  yellowish-white  on  its 
upper  i)art.  Fore  tarsi  from  the  tip  of  the  first  joint,  blackened. 
JIah.  Palissades,  New  Jersey  ;  in  June.  (Osten-Saeken.) 
Ohxcrvatiou. — The  female  will  probably  have  to  be  distinguished 
from  the  still  unknown  female  of  7).  itcopariuii  by  its  larger  size 
and  the  smaller  extent  of  tho  black  at  the  basis  of  the  fore  coxa'. 


I- 


Gen.  III.  GYMXOPTERjVITS. 

Corrected  Table  for  the  determination  of  tho  Species. 

Coloring  non-metallic.  1  flavus  r.w. 

Coloring  metallic.  2 

n  (  Third  joint  of  the  antennte  with  an  elongated  point.   2  subulatus  Lw. 
X  Third  joint  of  the  antennse  witliout  elongated  point.  3 

4 
7 


'{ 


„  (  Prevailing  color  of  the  feet  black. 
(  Prevailing  color  of  the  feet  yellow 


iling  color  of  the  feet  yellow. 

Third  joint  of  the  antennre  with  a  very  distinct  pubescence. 
4  J  3  scotias  Lw. 

(■  Third  joint  of  the  autenniB  with  a  scarcely  visible  pubescence.         5 


gUI'l'LEMENT. 


{niij^ht  mnlallio  green. 
Hliuik-grt'eii. 

(  WiiiL'H  tinu'cil  with  gray. 
{  WiiiK  Mackish. 


333 
24  pusiUuB  II.  Hi>. 


barbatul 
r<  tristi 


ns  f.w. 


f,  i  Tip  of  tlif  hind  femora  blackish. 
(  Tip  of  the  liiiiil  fi'tuura  not  blackinh. 


'I 

„  f  Tiiorax  dark  violet. 
I.  Thorax  not  violet. 


0 


(  Fore  coxa)  as  far  as  the  tip,  Mackish. 
(  Fore  coxto  yellowish. 


I  Aiiti'iina>  entirely  Mack, 

(  AntonniB  entirely  or  partly  red. 


(J  exilis  A"'. 
8 

0 
10 

7  spectabills  f.i(\ 
^  albiceps  /.w. 

11 
21 


1  { '' 

„  (  Lamella)  of  the  hj 
"  I  Lauielliu  of  the  h^ 


Fore  coxfo  at  least  at  tlio  basis  distinctly  blackened, 
ore  coxa)  entirely  yellow. 


12 
IS 


Lamella)  of  the  hypojiygium  black.  Sfi  chalcochrus,  nov.  sp. 

iypQI>ygiiim  yellowish.  13 

Last  joint  of  the  fore  taisi  of  the  male  somewhat  eiilarired. 
3  I  1*  Bubdilatatus  f^w. 

Last  joint  of  the  fore  tarsi  of  the  male  not  enlarged  at  all.  14 

21!  coxalis  f.w. 
-7  meniscus  Aw. 

11  frequens  Aw. 

l(j 

28  humilis,  nov.  sp. 

17 

1-  lunifer  Aw. 

18 


,  ^  Fore  coxa?  as  far  as  the  tip,  blackened. 

I  Fore  coxa)  blackened  only  at  the  basis. 
f.  (  Lauu'll.i'  of  the  hypopyginm  black. 

(  Lamella)  of  the  hypopyginm  not  Ulack. 

„  (  Hind  tarsi  entirely  black. 
I  Ilind  tarsi  not  entirely  black. 

Lainelho  of  the  hypopyginm  dark-yellow. 


{Lainelho  of 
Lamella)  of 


the  hypojiygium  whitish-yellow. 


Internal  appendages  of  the  hypopyginm  penicillate.  i:!  iitnbriatus  Aw. 


Internal  appendages  of  the  hypopyginm  not  penicillate. 


19 


29  ezigiiuB,  nov.  sp. 
20 


20 


q  (  Face  yellow. 
(  Face  whitish. 

Third  and  fourth  longitudinal  veins  strongly  convergent  towards  their 
end.  14  despicatus  Aw. 

Third  and  fourth  longitudinal  veins  altogether  parallel. 

ITj  difficilis  Aw. 
f  Hind  tarsi  from  the  tip  of  the  first  joint  black.        Id  laevigatus  Aw. 

21  <  Hind  tarsi  towards  the  tip  a  little  darker,  at  the  utmost  brown,  never 
i  black.  22 

/•  Middle  and  hind  eoxfe,  from  the  basis,  distinctly  blackened.  23 

22  ■>.  Middle  and  hind  coxce  yellow,  the  former  at  the  utmost  somewhat 
V         grayish.  25 


4" 


tk 


yv;' 


m 


f;    > 


¥ 


I  -1. 


^^L 


(    V 


«. 


■i 


li 


!  ;•  ; 


Mi*  '' 


24 


Th<;  lower  lart  of  tho  fauo  not  hairy. 
(  AnttMiiiit'  small. 


334  DIl'TKUA  OF  NdllTII  AMKIIICA.  [PAIIT  II. 

Tim  lower  part  of  the  fuce,  in  tho  fcniali',  (listiiu.tly  clothed  with  hair. 
2:1 1  1*<  nigribarbus  /.w. 

24 

17  parvloornis  /.w. 

{  Antcunm  rather  lurg<'.  l**  opacuB  /.«'. 

Of  (  Venter  iiml  posterior  Tnari,'in  of  tho  phmrro  not  yellow,  iJii 

(  V'miter  and  jiosterior  margin  of  tho  pleurie  yellow.  27 

10  politUB  r.ir. 

21)  debilis  /."■. 
21  craasicauda  Lir. 

22  minutiia  /.t, 
23  ventralia  i.ir. 


2i 


(  Thorax  Hhinim,',  front  white. 
(Thorax  rnthor  dull,  front  gray. 


„»  f  Ilypoiiyiiium  very  stout  and  lari^o. 

(  Hyiiopy^ium  of  ordinary  thicknuss  and  size. 


28 


f  Anteniiiu  very  small. 
I.  Antenna)  of  middle  size. 


19,   «.  politus  LoKW.      %  and  9. 

I  Imvc  DOW  ol)t!iin('(l  also  llic  iiialo  of  tin's  spocicf*.  Tlio  rros- 
(■{MU-sliii|)t'(l  liUMcllir  oftlK!  liypopyiriiiin  arc  wliitc-yellowish,  tlioir 
interior  ai)peii(laj!'»'s  not  iiciiicillate.  Th<(  dorsum  of  the  thorax 
is  not  ([uitc  so  l)ri,irlit  as  lliat  of  the  fonuilc,  which  otherwise  it 
rcscinbh'.s  very  much. 

21.   •».  iiilHillns,  nov.  sp.     9 .— L.tte  viridis,  nitens,  faoie  alh4,  coxis 
prreter  apicem  femorihusiiue  nigris. 

Bright  green ;  face  white ;  coxie,  with  the  exception  of  tho  tip  and  the 

femora,  '    aek. 
Long.  corp.  0.10.     Long.  al.  0.11. 

Bright  mctallic-g'rcon,  by  no  moans  lilnok-prrccMi,  Khiiiiiif^.  Front 
with  a  not  very  conspicuons  jrray-wliitish  dust.  Aiitcniim  black  ; 
tho  third  joint  not  very  small,  with  an  almost  imp(>rccptiblc  pu- 
bescence. Coxa)  black,  their  .second  joint  yellowish.  Femora 
black,  the  tip  of  the  four  anterior  ones  to  a  considerable  extent 
yello\,'ish.  Tibiie  yellow.  Tarsi  at  the  basis  yellow,  from  the 
tip  of  the  first  joint  blackened.  (The  hind  tarsi  arc  wanting.) 
AVinjrs  with  a  l)rownish-irray  tinge. 

Hab.   Illinois.     (TiC  IJaron.) 

Ohxervcttion. — A  single  fennile  of  this  species  is  in  my  posses- 
.sion  for  some  time;  but  the  rather  imperfect  condition  of  this 
specimen,  and  the  hope  of  obtaining  better  ones,  induced  me  to 
delay  the  publication  of  this  species.  As  m\'  hope  has  not  been 
fulfilled,  I  furnish  its  description  now.     It  is  easily  distinguished 


Kir'IM,KMF.NT.  .!.>.) 

from  (ill   tllior  ppccics  with  liliick  feet,  l»y  its  stiinllcr  size,  iiml  liy 
its  cdlor,  wliicli  is  not  Idiifk-ijn'cii,  hut  pure  f^rccii. 

aft.  a,  clialCOflirils,  uov.  sp.  %  mill  9. — Jliifo-viridis,  nitciin, 
aiitciiiiis  nii;i'i^,  {ludibutt  llaviM,  cuxiH  oniniliuri,  |)m>ter  uplcum,  liiinflli!«4iiu 
liyiKipyuii  iii^'rirt. 

Metallic  Rit'nn,  .sliininc ;  nntcntin'  Mnck  ;  fi'ot  yellow,  nil  tli«  coxni  with  the 
eXL'fptioii  of  tlu)  tip  1111(1  thu  IniiifUie  of  tlit)  liypux>ygiiiiu  black. 

Long.  coip.  (.1.15— O.ltJ.     I.diig.  111.  (i.l.'j— (t.lli. 

Mctiiilie  green,  sliininjr.  Antennie  entirely  blnek ;  llie  third 
joint  short,  with  11  not  ensily  pcrecptihle  pulx'scenec.  Fntnt 
covered  witii  white  dust.  Fiiee  (»f'the  %  oehre-yehow,  sometimes 
rather  hrownish-ydlow,  that  uf  the  9  firayish-white  ;  eiliii  of  the 
inlerior  orhit  hlaek.  Ujtper  side  of  the  thorax  covered  wilii  jrniy 
or  i)ro\vn-<rruy  dust,  whieh  is  distinctly  visible,  when  the  upper 
Hide  of  th(!  thorax  is  looked  at  in  an  ohlicpie  direction.  Kore 
coxiu  Itlackeiied  ns  far  as  the  middle  or  nearly  as  far  as  the  tip; 
the  four  hind  coxie  yellow  only  at  the  tip.  Feet  yellow  ;  tarsi 
from  the  tij)  of  the  first  joint  stronjxiy  colored  with  l»ro\vn  or 
l)la(;kened,  the  crcscent-shnped  lamelliu  of  the  liypopyfrium  hlaek. 
"\Viii>i's  tinj^ed  with  Ijlackish-^^ray  and  with  hrownish-hlack  veins. 

Hub.   District  of  Columbia  ;  New  York.     (Osten-Sacken.) 

Ohticrralioii. — The  female  has,  in  the  plastic  characters,  much 
in  common  with  tht;  fenude  of  (l.  t<]ircf(iliilit<,  of  which  I  have  now 
three  specimens  ;  but  the  latter  is  somewhat  larger,  and  the  third 
and  fourth  longitudinal  veins  of  the  wings  seem  to  be  somewhat 
closer  to  each  other  ;  I  cannot,  therefore,  believe  that  G.  xjuclabi- 
//.s  is  oidy  a  variety  in  color  of  G.  cJialcochrns,  and  ho])e  that  my 
view  will  bo  sustained  through  the  discovery  of  the  still  unknown 
iimlo  of  G.  upectabHia. 

!26.  G.  COXaliH  LoF.w.  %.  —  iEneo-viridis,  nitens,  nntennis  nisrris, 
coxis  omnibus  pnt'ter  .npiceni  iiittris,  pcdibiis  laniellisiiut;  liyjiopygii 
flavis,  articiilo  ultimo  tarsorum  aiiticonini  maris  non  dilatato. 

Metallic  green,  shinini; ;  antennip  black;  all  coxiP,  with  the  exception  of 
the  tip,  black  ;  the  feet  and  the  lamelh-e  of  the  hypopygium  yellow  ;  the 
last  joint  of  the  fore  tarsi  of  the  male  not  enlarged. 

Long.  Corp.  0.14.     Long.  al.  ('.H — (>.1"». 

SvN.    (I'ymnopteriius  caxulis  Loew,  Berl.  Knt.  Zeitschr.  VIII,  !U,  87. 

^letallic  green,  shining.  Front  with  whitish  dust.  The  an- 
tenna) altogether  black ;  their  third  joint  ovate  ;  the  face  some- 


'  t  ■ ..  ■.' 

''     '      ! 

.    ■  ■  f 

) 

,  ,  Pi.-:---  . 


3.S() 


nil'TKKA  (IF  NOirni  AMKllICA. 


[I'AKT  II. 


wluit  brondcr  tliiin  in  the  in.alcs  of  iiii»st  of  llio  otlu'i'  species,  and 
white.  All  tlic  e(j.\;u  hhiek,  only  fiie  '.vtreiiio  tip  yellow.  Feet 
yellow;  the  four  anterior  tarsi,  fmni  the  tip  of  tl  •  first  joint, 
blackened;  tlie  hindmost  ))lack,  with  the  exception  of  the  liasid 
iialf  of  the  lii'st  joint ;  the  last  joint  of  the  fore  tarsi  not  enlarged. 
Jlub    New  York.     (Osteii-Sacken.) 

Ob/^rr ration, — T  dare  not  i)ositiveIy  decide  Avliether  a  male, 
vhich  Mr.  Le  JJaron  eaiiu'ht  in  Illinois,  l»eloii<;s  to  this  species  or 
not.  It  dillers  from  the  aljove  desci'ilied  typical  males  in  a  re- 
markahh;  deji'ree,  as  it  has  the  first  two-thirds  of  the  fore  femora 
and  the  upper  side  of  the  hind  femora  infnscate<l,  and  the  hind 
tar>i,  with  the  exception  of  tin;  extreme  l)asis  of  the  first  joint, 
of  a  black  color;  moreover,  the  third  joint  of  the  antenna!  is  a 
little  shorter.  1  would  not  venture  to  estai)lisli  a  separate  species 
upon  this  single  speoimeu. 

Uf.  <».  lllclliMCUH  LoF.w.  %  and  J. — .Thu'o-viridis,  niteiis,  nnteiiiiis 
niirris,  coxis  anticis  pra'tcr  basim,  pe(lil)iis  lajiicllirtiiue  hypopygii  llavia. 

Metallic  grt'l'ii,  sliiiiini: ;  antciiniP  l)lat;k  ;  t'oro  (.'OXH!,  with  the  I'xcejttion  of 

the  l)a.si.«,  feet,  and  lamella'  of  the  hypopygiuiii,  yellow. 
Lonir.  eorp.  Clf).     Long.  al.  0.1.'). 
Sy.v.    (!i/miiojiterniis  mcniscini  LoEW,  Borl.  Ent.  Zeitschr.  VIII,  04,  88. 

Kesenibles  tlie  (r.  ro.nilix  very  much,  but  is  somewhat  larger 
and  more  of  a  bron/.e  color.  Fore  coxse  black  always  (jnly  at  tln^ 
l)asis  ;  the  third  joint  of  the  anteuiue  a  little  shorter  and  Itroader, 
all  the  rest  like  the  preceding. 

Hub.  Distriet  of  Colnnil)ia.     (Osten-Sacken.) 

^S.  <ir.  llliniills,  nov.  sp.  %  and  9  .— iEneo-viridia,  nitens,  anfonnis 
iiigris,  faciii  albil,  coxis  antieis  toils,  pedil)us  laniellis(iiie  hyi)oi)ygii  tlavis, 
tihianini  postijaruni  apice  infuseato,  tarsia  posticis  totis  nit^iis. 

i\Ietallio  green,  shining  ;  tlio  anteniue  black  ;  face  white  ;  the  whole  fore 
coxiP,  the  feet,  and  the  laniell.'e  of  tlie  hypopygiuni  yellow  ;  the  tip  of 
the  hind  tibine  infuscated  ;  hind  tarsi  entirely  black. 

Long.  corp.  0.12.     Long.  al.  0.12. 

;^^etallie  green,  shining.  Front  covered  with  white  dust.  The 
antenuic  altogether  black.  The  narrow  face  of  the  nndt?  white, 
the  very  broad  face  of  the  female  whitish.  The  crescent-shaited 
lamelhe  of  the  hypopygium  yellow,  sometimes  almost  dark-yellow. 
Fore  coxtc  altogether  yellow;  middle  eoxu3  on  the  whole  outside, 


Sri'l'I,K>IK.\T. 


3»" 


liiinl  ('o.\:i>  at  least  on  a  jtarl  of  it,  lilackisli.  Ft'ct  yellow;  tlic 
liiiid  til)i;i>  of  the  feiiiiiie  are  iii<listiiK'tIy  infiiscatcd  at  the  tip ;  tiiosc 
of  tJK'  male  aro  disiiiictly  infiiscatcd  or  oven  ))lackcii(Ml,  csitccially 
upon  their  inner  side.  'I'lie  hind  tarsi  are  entirely  hlack.  Win<;:.s 
tiiijred  Avitli  hlaekisli-u'ray. 

Ihib.    'Si'W  \o\-k  (Osten-Saeken) ;  Illinois  (Le  ]>aron). 

2!>.    Cii.  (>xi;;iills,  nov.  sp.      %. — ^Eneus,  iiitc^ns,  aiitennis  iiii.'ris,  facio 
ochrat'cd,  coxis  aiitiuis  totis,  pedilms  laiiiBllisiiuo  liypopycii  llavi.->. 

]ii()ii/t'-((il(ii'('il.  sliiiiiiiu' •    ;!ril('iiii!o  blauk  ;   facu  (Hjlirc-yelliiw ;   tlio  wlml'? 

f{ii(?  cox.'i',  tlio  ft'ot,  and  tlu(  laiut'llju  of  tlie  liyiioiiygiuni  yellow. 
Long.  coip.  (1.1:2.     Long.  al.  (KVl, 

More  l)r<inze-('olored  than  metallic  jrreen,  sliiniiiir.  1  •ont 
covered  with  a  oray-wliitish  dust.  Anteiiiiie  ail<ij;'ether  l)hiek, 
the  narrow  face  brownish  ochre-yellow.  TIk;  creseent-shapcil 
laniclhi'  of  the  livixipviiiiiiii  velluwish.  Fore  coxse  eiitirelv  vcl- 
low  ;  also  the  four  jiosterior  coxse  mostly  yellow,  hut  tiic  whole 
outside  (jf  the  niiddh'  <M(.\a!  and  a  consideraltle  portion  of  the  out- 
side of  the  hind  coxa'  Ithu'kish.  Feet  yellow;  the  tarsi,  with  the 
exception  of  the  basis,  strong'ly  infuscated.     Wings  fi'ray. 

I  lab.   JlliiKds.      (TiC     aroii.) 


m 


^{ 


-; 

«{ 
J 


Oen.  V.     PKLASTOXEIRIS. 

Corrected  Tchlc  /'or  dcti nitiiiiin/  the.  Sjieries, 

Cilia  of  tlir>  intVMior  orMt  lilndc.  2 

Cilia  of  till'  inft'iior  orbit  ■wliitisli.  (J 

A  bright  white,  glittering  .spot  on  the  posterior  margin  of  tin'  (borax. 

1  longicauda  /.oiiu. 
No  such  whito  spot  on  the  posterior  margin  of  the  tlioiax.  ;{ 

Wing.s  blackened.  2  lugubris  /.our. 

Wings  tinged  with  blaekish-gray.  4 

Fore  cox*  altogetln'r  yellow  ;  lamella;  of  the  hypopygiiup.  loTig. 

.'!  leetna  f.orn\ 
Fore  coxae  not  aUo^iether  yellow?  ;  lamella!  of  the  hypopyu'iinn  .sjioit.    ■'> 

Only  the  basis  of  tlie  fore  coxa'  blaekeiied.  i)  lamellatus  /-mir. 

The  whole  (l'»r«  co.x.e  blackeni'd.  7  abbreviatiis  /.ocio. 

Fore  coxa-  bb'ickened  at  the  basis.  4  vagans  I.oi'w. 

Fore  coxai  entirely  yellow.  7 

Dorsum  of  the  thorax  of  a  uniform  color.  ,'j  cognatus  /.oew. 

Dorsum  of  the  thorax  copper-colored,  with  blue-green  strijies. 

a  alternans  Locw. 
22 


m 


1,1 


'.4 


f 


i   ;,:!■ 


■I'} 


wt 


338 


inPTEllA  OF  NOUTU  AMERICA. 


[PAUT  ir. 


6.  P.  laniellatlis  Lokw.  %. — Ohs'^'. re  viridi-a-ons,  postica  thoracis 
parte  et  scntello  violaceis,  seta  aiiteiinarum  pilis  loiigioriliua  pluiiiata, 
ciliis  oculorum  iiiferioribus  iiigri.s,  pedilius  flavis,  coxis  anticis  coiicolori- 
bus,  basini  versus  uigris,  lamellis  hypopygii  brevibus,  nigris. 

Dark  1)roiize-green,  the  hind  part  of  tlie  thorax  and  the  scutellum  vioh4  ; 

arista  feathered  with  ratlier  lung  liairs  ;  cilia  of  the  inferior  orbit  black  ; 

feet  and  fore  coxai  yellow,  the  latter  black  at  the  basis  ;  the  short  laiuellse 

of  the  hyiiojyygium  black. 
Long.  corp.  U.12.     Long.  al.  0.12. 
Syx.   PelastoneuruK  lamellntus  Lokw,  Berl.  Entom.  Zeitsch.  VIIT,  Df),  00. 

Dark  grcon,  Ijronzc-colort'd,  tlio  larj^or  portion  of  the  poi^terior 
])artof'tlio  dorsinii  oftlic  tliorax  and  the  scutoUiim  videt.  Front 
dark  violet,  sliiiiiiijr.  Aiitcniue  dusky  rod,  niu.st  of  the  third  Joint 
))]aclv-l)ro\vii.  Tlic  feathery  pul)escence  of  the  arista  rather  loiii^. 
Face  witli  a  wlutc  rclleetioii.  Cilia  of  the  inferior  orbit  blaek. 
Tlie  iiupresriioii  on  the  lateral  end  of  tlie  transverse  suture  of  the 
thorax  with  a  brifrlit  white  refleetion.  The  lanu-lke  of  the  liyj^o- 
pyu'iuni  ishort,  rather  ere>;eent-shaj)ed,  blaek  and  covered  with 
blaek  hair.  Fore  eoxte  yellow,  blaekened  from  the  I)asis  up  t,o 
the  middle.  Feet  yellow;  the  extreme  tip  of  the  hind  femora 
black,  ^riddle  tibiio  at  the  extreme  tip,  hind  libia'  at  the  <'xtrriue 
))asi,s  and  tip,  brown  or  black-brown  ;  fore  tarsi,  towards  the  end, 
stronjrly  infusciited  ;  the  four  posterior  tarsi,  wiiii  the  exception 
of  the  basis,  brownish-l)lack.  Tegula)  whitish,  with  black  cilia. 
WinfT.s  tinged  with  blackish-grny ;  the  s})ace  between  the  third 
and  fourth  longitudinal  veins  comparatively  broad. 

Bab.  New  York.     (Osten-Saeken.) 

■y.  P.  al»l>l'evia<us  Lokw.  %  and  J. — Obscure  viridi-reneus,  PetA 
antennarum  breviter  plumata,  ciliis  oculorum  inferioribus  nigris.  pedibns 
ex  testaceo  Havis,  fenioribus  aiiterioribns  basini  versus  interduin  infus- 
c.atis,  coxis  omnibus  nigris,  lamellis  hypopygii  brevibus,  nigris. 

Dark-green,  bronze-colored  :  arista  feathered  with  short  hairs  ;  cilia  of  the 
inferior  orbit  black  ;  feet  brownish-yellow  ;  the  anterior  femora  towards 
the  basis  sometimes  infuscated  ;  all  the  coxjb  blackish  ;  the  short  lamellte 
of  the  hypoiiypiuni  black. 

Long.  corp.  0.13.     Long.  al.  0.13. 

Syn.  Pi- I  ant  one  urns  (lUircviatiin  Lokw,  Berl.  Entom.  Zeitschr.  VIII,  94,  89. 

Dark  gretMi,  lironze-colorcd.  Front  dark  steel-blue.  Anlennie 
rather  dull  red  ;  third  joint  mostly  black-brown.  Arista  of  the 
antenn:«  feathered  with  very  short  hairs.     The  face  of  tli''  'uale 


BUPl'LKMKNT.  .jJi) 

with  a  wliito  reflection,  tliatof  tlie  female  (larl\-jrray,  rovore(l  witli 
wliiti.sli  (lust  only  at  tlic  toj)  and  on  tlio  lateral  niarj^in.  Cilia  of 
the  iiif'.'rior  orl)it  hlaek.  Upper  side  of  the  thorax  somewhat 
covered  with  brown  dust,  more  shiiunu^  towards  the  jiusterior 
margin  ;  tlie  impression  on  the  lateral  end  of  IIk;  transverse  suture 
with  a  white  reflection.  Scutellnn)  steel-blue.  Laiuelhe  of  tlie 
hypopygium  short,  crescent-shaped,  lilaek,  and  covered  with  black 
hair.  All  the  coxic  I)laeki.<h.  Feet  yellow,  or  brownish-yellow ; 
the  tip  of  the  hind  femora  black;  tlie  fore  femora  are  often  infus- 
cated  to  a  considerable  extent  towards  the;  basis  ;  the  middle 
femora  also  sometimes  show,  towards  the  basis,  a  distinct  infusca- 
tinii  ;  the  extreme  tip  of  the  middle  tibiic,  as  also  the  basis  and 
the  tip  of  the  hind  tiI)iio  are  usually  also  somewhat  infuscated. 
Fore  tarsi,  towards  the  tip,  strongly  infuscated  ;  middle  and  hind 
tarsi,  with  tlie  exception  of  tlie  liasis,  black-brown.  '^regulse 
yellowish  with  black  cilia.  AViiigs  tinged  with  Idackish-gray ; 
the  <i>ace  between  the  third  and  fourth  longitudinal  veins  rather 
narrow. 

Huh.  New  I*ochelle,  X.  Y.,  in  June.     (Osten-Sacken.) 

8.  P.  alteriiaiiS  Lokw.  9- — <^l>scure  viridis,  vittis  thoracis  alter- 
nantibus  seneo-cuprei.s  et  ex  cferuleo  viridibus,  seta  aiitemiarum  breviH- 
sime  sul>pluinata,  ciliis  oculoruiu  iiiferioribus  albidis,  coxis  anticis 
peiUbuscjue  flavis. 

Dark  greon  ;  th«  thorax  alternately  with  dark  copper-red  and  blue-green 
longitudinal  strii)es  ;  arista  feathered  with  very  short  hairs;  cilia  of  tfie 
interior  orbit  whitish  ;  fore  cox;e  and  feet  yellow. 

Lon      cor-p.  0.13.     Long.  al.  0.13. 

Syx.   J\l<i.tt<jiieiinis  (iltcriKins  Loew,  Berl.  Ent.  Zeitschr.  VIII,  95,  t)l. 

Dark  bronze-green  ;  thorax  with  alternately  lilne-green  and  dark 
'^oppei'-colored  longitudinal  strijies.  Front  steel-blu<'.  Antenna! 
V('i\.  iiio>t  of  the  third  joint  black-brown;  the  arista  feathered 
with  \  I'l'v  short  hairs.  P'ace  narrower  than  in  the  females  of 
other  species,  dark  gray.  Cilia  of  the  inferior  orliit  whitish. 
Scutelliini  blue-green,  almost  steel-blue.  The  impression  on  the 
lateral  iiwirgin  of  the  thorax  has  a  bright  white  reflection.  The 
whttU'  fori'  coxa'  and  the  feet  yellow  ;  hind  feiiioi'a  sciircely  some- 
wliat  blackened  at  the  extreme  ti}) ;  the  tarsi  from  the  tip  of  the 
irst.  joint  bhu-k.  Tegiihe  white-yellowish,  with  black  cilia. 
Wings  tinged  with  lilackish-gray. 

JIab.  Xew  Kochelle,  X.  Y.     (Osten-Sacken.) 


M) 


I  ^ii  Ik- 


-■•    ■   ;,  it-' 


-i; 


I 


i! 


iM 


'fl 


ii 


• 


340 


l\ 


^li 


.31! 


DIPTERA  OF  NORTH  AMERICA. 


Gen.  XX.     PORPIIYROPS. 


[part  II. 


5.  p.  longipes  Loinv.  %  . — Viridis,  facie  alba,  coxis  ex  viridi  nigris, 
peclibus  anterioribus  llavis,  iiltiiiiis  tarsoruni  articulis  nigrin,  piirlibii,^ 
posticis  uigris,  feiuorum  basi  tibiiscjue  supra  (basi  taineu  excepta) 
testaceis,  apice  hariim  tarsiwiiue  fuscis,  exterioribus  liypopygii  appen- 
dicibus  filiforuiibus,  bipartitis. 

Green  ;  face  white  ;  coxne  black-green  ;  the  four  anterior  feet  yellow,  the 
last  joints  of  the  tarsi  black  ;  tlie  basis  of  the  femora  and  the  upper  side 
of  the  tibiie,  with  the  excejjtion  of  the  tip,  brownish-yellow,  the  tip  of  the 
tibite  and  the  tarsi  brown  ;  the  exterior  ai)pend;iges  of  the  hypopygium 
linear,  bipartite. 

Long.  corp.  0.2(J.     Long.  al.  0.21. 

Syn.  Porphijrojis  lonijipes  Loew,  Berl.  Ent.  Zeitschr.  VIII,  95,  92. 

Dark  green,  shining  ;  lliorax  with  two  narrow  approximated 
darli  streaks.  Front  covered  witli  white  dust.  Anteniue  bhiok ; 
the  third  joint  lanceolate;  the  arista  a  little  shorter  than  the 
anteiMine.  The  narrow  face  Avhite.  The  lower  part  of  the  occiput 
clothed  with  dense  yellowish  hair.  Abdomen  above  with  black, 
on  the  sides  with  yellowish-white  hairs.  Tiic  exterior  appendages 
of  the  hypopygium  dusky  yellowish,  linear,  bipartite,  and  betJct 
with  delicate  whitish  hairs.  Fore  feet  3'ello\v  ;  the  two  last  joints 
of  the  tarsi  black  ;  the  tip  of  the  preceding  joint  black-brown  ; 
the  fore  femora  upon  the  latter  part  of  the  upper  side,  blackened  ; 
the  tip  of  the  first  joint  of  the  fore  tarsi  iiierassateil,  almost  denti- 
form on  the  under  side.  Hind  femora  blav'k  with  brownish-yellow 
basis.  Hind  tiltia^  and  liind  tarsi  comparatively  stout ;  the  tibiae 
black,  on  the  upper  side,  with  the  exception  of  the  tip,  ))rownish- 
yellow  or  yellow,  tiie  tip  brown ;  the  tarsi  brown,  their  tips  black. 
All  the  feet  longer  than  in  most  of  the  other  species  o{  ForphyrojiK. 
All  tiie  coxa>  greenish-lilack  with  a  pale  pubescence ;  the  middle 
ones,  at  their  tii)s,  with  black,  approximated  bristles,  forming  a 
tuft,  not  unlike  a  thorn.  Teguhe  yellowish,  with  whitish  cilia. 
Wings  tinjred  with  browMiish-gray  and  with  Ijlackish-brown  veins; 
the  e?id  "f  tjic  third  longitudinal  vein  gently  curved  dow'uwards  ; 
the  last  segment  of  the  fourth  longitudinal  vein  inflected. 

Hab.  White  Mountains,  Xow  Hampshire.     (Osteu-Sackeu.) 


m 


EXPLANATION  OF  THE  TLATES. 


PLATE  III. 

1.  nygroceleiitliiiH  i.atipes  Ln:  % . 

a.  head  'Jj ,  b,  head  9,  c.  antenna  ^  ,  and  (/.  wing  ^  . 

2.  DOliChopilS  FDNDITOR  Lw.    %  . 

a.  head  %  ,  h,  head  J  ,  c.  antenna  ^  ,  and  d.  wing  J  . 

3.  Rliagoiieiirus  polychroaius  Lu\  % . 

a.  head  % ,  b.  antenna  % ,  and  c  wing  9  • 

4.  Gyninopterniis  lunii-er  Lw.  %  . 

a.  head  %,  and  /).  head  J  of  (Jiintnnpternns  crast^icdnrld  Lw. — c.  an- 
tenna %  of  6^.  liiiii/er, — (/.  antenna  %  of  G.  sttlmlatKs  Lw. — f.'. 
wing  9  of  6'.  crassicaitda. 

6.  Pelastoiieuru!^  vacaxs  Zw.  -^ . 

a.  antenna  ^ ,  /*.  head  % ,  c.  head  9 1  ''■"•1  ''•  wing  % . 

6.  Tacliytreclius  vouax  Lw.  %  . 

a,  head  %  of  T.  vorax. — /).  head  'J,  of  7.  moechioi  Lw. — c.  antenna 
^  of  7".  vorax. — d.  antenna  %  of  T.  muechus. — e.  wing  9  "' 
T.  vorax. 

a,  Paracliiis  alroxotatus  Ln\  %  . 

a.  head  9  >  ''•  antenna  9  i  •in'l  f^-  wing  9  of  P.  arcnatus  Lw. 

8.  Ortliocliile  soccata  Lw.  %  . 

a.  and  b.  head  % ,  c.  antenna  % ,  and  rf.  wing  ^  of  same. 

9.  Ilercostomus  i-nicolor  Lw.  % . 

a,  antenna  %,  and  b.  wing  of  same. 

PLATE  IV. 

10.  Sybistroma  nodicornis  .lA  k/.  %  . — 

a.  and  b.  head  9  >  <'•  head  'J, ,  d.  antenna  9  i  ^-  antenna  % ,  and 
/.  wing  %  of  the  same. 

(  341  ) 


J-i- 


,  :.'•.■ 


lii 


15-    '  '■ 


-  .|i vvi 


■  .  'V,  i  .■  §]■  >'■ 


'  m 


.•..> 


: 


;■:;.'  ; 


i.i  ^ 


1  'H 


\m 


■I 


342 


DIPTERA  or  NORTH  AMERICA. 


[part  II. 


11.  llypopliyllus  nisciPEs  yl/ir.  %. 

a.  head  9 1  ^-  autenua  J ,  c.  autenna  % ,  and  d,  wing  %  of  the 
same. 

12.  IIaltericerii8  EccKRus  Aw.  %. 

a.  head  % ,  b.  auteuua  f ,  c.  antenna  % ,  and  J.  wing  'J  of  the 
same. 

13.  Diostraciis  pkasin-us  Lw.  %. 

a.  antenna  %,  h.  head  %,  c.  head  9»  and  d,  wing  ^  of  the  same. 

14.  Anepsiiis  flaviventkis  Mel<j.  ■^ . 

«.  head  % ,  b.  antenna  % ,  and  c.  wing  %  of  the  same. 

15.  Argyra  albicans  Liv.  % . 

a.  })ead  % ,  b.  head  J ,  c.  antenna  ^ ,  d.  antenna  9  >  and  e.  wing 
^of  the  same.' 

16.  Syntornion  metathesis  Lw.  % . 

a,  head  % ,  b.  head  9  >  c-  antenna  %  from  the  outside,  d.  antenna 
9  from  the  inside,  e.  antenna  %  inside,  and  /.  wing  -J,  of  the 
same.* 

IT.  Synartliriis  palmaris  Lw.  %  . 

u,  head  9  i  and  b.  head  %  of  <!>.  pallipes  Fabr. — c.  antenna  'J, ,  and 
d.  wing  ^  of  S.  paimaris. 

IS.  Systenus  Scholtzii  Lw.  %. 

a.  head  'I,  of  S.  bipartitus  Lw. — 6.  antenna  %  of  5.  Scholtzii. — d. 
wing  •£  of  S,  adpropinquans  Lw. 


I«  i  W  .  := 


w 


PLATE  V. 

19.  Rhaphilim  lonoicorne  Meig.  %  . 

a.  head  9  t  ''•  head  % ,  c.  head  9 »  «?•  antenna  "^ ,  and  e.  antenna 
9  of  the  same.— y'.  antenna  9  of  R.  lugubre. — g.  wing  9  o^ 
R.  longlcoriie. 

20.  Xipliandriiini  qpadripilatum  Liv.  % . 

a,  head"^,  and  b.  head  9  of  X.  caliginosum  Meig. — c.  antenna  % 
of  X.  quadrifilaium. — d.  antenna  %  ,  e.  antenna  9 1  and  /,  wing 
9  of  -X^.  caliginosam. 

21.  Porpliyrops  melampus  Lio.  % . 

a.  head  % ,  b.  liead  9  i  c.  antenna  ^ ,  d.  antenna  9  >  ^^"^  ^'  ^'"S 
'^  of  the  same. 


'  The  antennal  arista  of  the  %  was  made  by  the  engraver  a  little  too 
long,  that  of  the  9  ^  little  too  short. 

'  Owing  to  a  mistake,  which  was  discovered  too  late,  the  posterior  trans- 
verse vein  is  wanting  in  fig.  /  in  some  of  the  impressions  of  this  plate. 


EXPLANATION  OF  THE  PLATES. 


343 


22.  Siniliotus  maiutim^e  Hal.  %  . 

a.  iiiiteniia  %  of  S.  thinophihia  Lw. — h.  antenna  %,  c.  bead  ^,  d. 
head  9 ,  and  e.  whig  %  of  S,  luuritimas. 

33.  AplirosylUS  KAPTOK  Wall:.  %. 

a.  antenna  % ,  b.  and  c.  head  %, ,  d.  wing  ^  of  the  same. 

34.  Tliinopliilus  flavii-alpis  Zeit.  %  . 

(/.  antenna  % ,  h.  head  %, ,  c.  head  9 1  '^^  wing  J  of  the  same. 

25.  Peodcs  foecipatus  Z,w.  '^ . 

«.  head  '^ ,  6.  head  J ,  c.  antenna  % ,  d.  wing  ^  of  the  same. 

26.  IVeniatoproctiis  DisTEXDKNs  J/?/"<7.  %. 

a,  head  'J, ,  b.  head  f ,  c.  antenna  % ,  rf.  wing  %  of  the  same. 

2T.  Leucostola  cixoulata  Aw.  ■J, . 

a.  head  ^ ,  b,  antenna  % ,  and  c.  wing  ^  of  the  same. 

PLATE  XL 

28.  EUtarSllS  ACLICDS  Mfir;.    1 . 

a.  head  ■J, ,  /).  antenna  'J, ,  and  c.  wing  %  of  the  same. 

29.  Diapliorus  spectabius  Lw.  % . 

a,  head  "^ ,  Z».  head  9  of  D.  soilalis  Lw. — c.  head  ^ ,  and  d.  an- 
tenna %  of  Z>.  spectabilis. — e.  wing  9  of  A*,  interruptus  Lw. 

30.  liyroneunis  f^RULEscENs  Lw.  9  • 

a.  head  9  >  ''•  the  same  from  the  side,  c.  antenna  J ,  d.  wing  9 
of  the  same. 

31.  Chrysotus  oDLiQUDs  Aw.  %. 

a.  head  9)  ^"'^  ''•  head  %  of  C  oblifjitus. — c.  head  'J,  of  C.  vivldiis 
Lw. — (I,  antenna  %  of  C  viridiis. — e.  antenna  %  of  C.  ohlifpins 
Lw. — -f.  antenna  %  of  C  cornutus  Lw. — ^.  wing  ^  of  C.  vividus. 

32.  Teuclioplioriis  moxacaxthus  Zw.  'J, . 

a.  liead.  '^ ,  i.  antenna  % ,  and  c.  wing  '^  of  the  same. 

33.  Campsicneiiius  claudicans  Liv.  %  . 

a.  head  %  of  C.  rlaudicdiis. — b.  middle  foot  "^  and  antenna  %  of 
C.  hirtljie.-!  Lw.—  (/.  antenna  %  and  wing  9  of  C.  claudicaiis. 

34.  Synipyciiiis  nodatus  /.w.  -j,  . 

a.  head  % ,  6.  head  9 »  c.  antenna  9  >  '^'  antenna  t,  of  S.  nodalus.— 
e.  wing  "J,  of  S.  iir>i<iiiHs  Lw. 

35.  L.iancalMs  oi-nuams  Lw.  %. 

ti.  antenna  %  ,  h.  head  9  i  f-  head  ^  ,  and  d.  wing  9  of  the  same. 

36.  Plagionetirus  rxiviTTATcs  Lw.  9. 

a.  liead  9 »  ''•  antenna  9  >  and  c.  wing  9  of  the  same. 


■■J-  -il: 


??  E,  :-  rt'^ 


t 
■  I,    f 


:■•:■-  I-  -  ' 


'  t 


i1. 


344 


UU'TEIIA  OF  NORTH  AMKUICA. 


PLATE  VII. 


[PAUT  II. 


37.  Scelliis  Aviprs  Lw.  % . 

a.  huail  % ,  I),  antonna  % ,  and  c.  wing  %  of  the  same. 

3S.  Ilyflroplioriis  innotatds /^!<;.  %. 

((.  .luteniia  %,  b.  head  9i  ''•  wiug  %  of  the  same. 

39.  IVIedeterU!^  ihadema  Linn.  % . 

a.  and  />.  head  % ,  c.  antenna  % ,  and  (/.  wing  ^  of  the  same. 

40.  Aclialciis  FLAVicoLLis  Meig.  9 . 

o.  and  i.  head  J ,  c.  wing  J ,  and  rf.  wing  9  of  the  same. 

41.  Xaiithocliloriis  ukiaixos  Lw.  %. 

a.  head  % ,  b.  antenna  % ,  c.  wing  %  of  X.  ornatus  Hal. 

42.  Chrysotiiims  pusio  Lw.  % . 

a,  head  9  >  ''•  antenna  % ,  c.  wing  'J  of  C.  molliculus  Fall. 

43.  Saiicropus  dimidiatds  Lw.  %  . 

a.  antenna  9  from  the  outside,  b.  antenna  "^  from  the  inside,  c. 
head  9 »  <'•  head  % ,  and  e.  wing  '^  of  the  same. 

44.  Psilopiis  FiLiPKs  Lw.  %  . 

u.  head  %  oi  Ps.  Jilljies. — I),  head  %  of  Ps.  scobinator  Lw. — c.  head 
"^  of  Ps.  palleiis  Wied. — <l.  antenna  %  of  Ps.  scintillans  Lw. — 
e.  antenna  %  of  Ps.  jiilosns  Lw.— ;/'.  antenna  %  of  Ps.  comdtus 
Lw. — ^.  antenna  ^  of  an  undescribed  species  from  Ceylon, 
related  to  Ps.  globuli/er  Wied. — h.  wing  '^  of  Ps.  psittacinus 
Lw. — (.  wing  •£,  of  Ps.  scobinator. 


'i.i  .... 

r\  ':: 

l!-: 

?■! '^■: 

*'' 

REMARKS  ON  THE  GENERIC  CHARACTERS, 

EXPLANATORY  TO  TIIK  TLATKS. 


Altiiocoii  the  present  publication  on  North  American  Dnlirhnpodld.r  was 
based  upon  a  eoiisiilerahlo  iiuuiher  of  sp^'cies,  it  can  bo  safely  assuiueil 
that  these  species  do  not  represent  all  the  Genera  occurring  in  North 
America.  I  have,  tlierefore,  ailded  the  characters  of  even  those  genera  of 
the  family,  representative  species  of  which  have  not  yet  been  found  on 
that  continent,  and  I  hope  that  this  a<lditi()n  will  prove  useful  to  those 
desirous  of  studying  this  family  in  detail.  In  order  to  facilitate  the  recog- 
nition of  generic  characters,  live  plates,  drawn  for  this  purpose,  have  been 
added  to  this  volume.  But  as  on  these  plates  every  genus  is  represented 
only  by  a  single  species,  this  might  easily  give  risa  to  the  mistake  that 
specific  marks  belonging  to  that  particular  species  are  generic  characters. 
In  order  to  prevent  this,  I  have  deemed  it  advisable  to  append  to  the  plates 
the  following  explanatory  remarks  on  the  generic  characters,  which  should 
always  be  consulted  in  determining  species. 

The  figures  of  the  antennas  show  that  the  first  joint  iv  No,  1 — l(i  is  dis- 
tinctly provided  with  bristles  on  the  upper  side  ;  in  Xo.  17 — 44,  on  the  con- 
trary, it  is  glabrous.  This  distinguishes  the  two  principal  iHcisions  of  the 
Dolichopodidoe. 

Among  the  species  belonging  to  the  FIRST  PRINCIPAL  DIVI- 
SION the  genera  numbered  from  1  to  12i  have  a  couiph^tely  disengaged, 
elongated  hypopygium  ;  those  numbered  14—11)  a  small,  rounded,  more  or 
less  imbedded  one  ;  in  No.  1")  the  hypopygium  is  short  and  sessile,  but  not 
imbedded,  so  that  tills  genus  (Diostracus)  forms  a  transition  from  one  of 
these  two  siihilivisions  to  the  other,  and  may  be  incluiled  either  in  the  first 
or  in  the  second.  I  have  given  preference  to  the  first  arrangement,  but 
have  separated  this  genus  from  all  the  others  of  this  subdivision  on 
account  of  the  very  large  size  of  the  palpi  of  the  male. 

The  other  genera  of  the  First  Sub-division  stand  much  nearer  loeach 
other  in  their  organization  :  they  may,  however,  be  easily  arrangeil  into  two 
groups  according  to  the  circumstance  whether  the  first  joint  of  the  bind 
tarsi  is  provided  with  bristles  on  its  upper  side  (No.  1 — 3),  or  is  without 
such  bristles  (4 — l(i).  To  the,/n-,s7  of  thrse  (jronpsXniXowg:  Hygroceleutlius 
(1),    Dolichopus    (2),    and    Rhagoneurus    (.3).      The    difference    between 


'  These  numbers  I'efer  to  the  plates. 


(345) 


Wm 


■:?  'm 


340 


Dll'TKU.V  til'  NollTll  AMKIUCA. 


[I'AllT  If. 


IH  :■ 
It  ij ' 


[< « 


Hygroceleuthufl  ainl  Dolichopus  consists  in  tlirt  structuru  of  tho 
hc.ul,  wliiili  is  liiglicr  iuid  nariowt-r  in  ll^groutiU'iUlius,  esiitH;iiilly  in  tii(t 
inaUs,  iind  in  tin-  ItMigtli  of  tliu  fitcc,  which  ruaches  fartlier  down  in  Ilyu'io- 
cfli'iiiliiis  and  gives  to  tho  head  a  diircrfnt  inolilo.  Thu  giMiiis  Rhago- 
ueiirus  liilfiji's  from  Tacli^'trt-clius  and  Dolichopns  by  thu  foatlit-red  ari>ta 
of  till'  ant(iiin!c  and  th«  dillifi't'iit  structuro  of  tlio  niah'  ahdoniun,  wiiioh  is 
a  little  I'oiniu'c.-'stMl  laterally,  as  aljso  by  the  fracturo  of  tliB  last  segment  of 
tlie  fourth  longitudinal  vein  peculiar  to  it,  and  in  whitdi  it  is  not  ciiualli'il 
Ity  any  of  those  species  of  Dolicliopns  wliich  liave  the  last  segment  of  the 
fourth  longituilinal  vein  also  fractured  ;  in  the  structurw  of  tho  head  Hha- 
goneunis  agrees  with  Dolichojius,  in  that  of  the  hypopygiuiu  with  Doli- 
cliojius  and  Tuchytrechus. ' 


'  Mr.  Rondani  has  estahlislied  tho  genus  ithageneura  "U  those  Kuropeaii 

species  of  l»olicho[uis,  the  fourth  longitudinal  vein  of  whicli  is  broken.  This 
genus  cannot  ho  retained  in  this  sense  for  several  reasojis.  1.  Because 
these  species  do  not  dill'er  at  all  from  tlio  otlior  si)ecies  of  the  genus  in  tho 
other  parts  of  their  organization.  2.  Because  tho  fracture  of  tho  fourth 
longitudinal  vein  of  these  species  is  very  dillerent  in  kind  as  well  as  in 
degree.  '••.  iecause  this  fracture  in  some  sjiecies  is  sometimes  present, 
sometimes  not.  I  have  already  stated  above,  on  p.  10,  that  Dol.  ziczao 
Wild.  ri-i]uii'es  the  establishment  of  a  new  genus.  At  that  time  I  knew 
only  this  one  si)ecies  of  the  newly  proposed  genus,  and  considered  thereftu-e 
its  establishment  as  premature,  yinco  theu  1  liave  become  ac(]uainted 
with  several  species,  so  that  1  feel  prejjared  now  to  introiluco  this  now 
genus,  and  take  occasion  at  the  same  time  to  furnish  a  description  of  the 
typical  siiecios  which  I  have  figured.  I  projioso  for  this  new  genus  the 
name  of  Rhageneura,  introduced  by  Rondani  in  a  somewhat  different  sense, 
modifying  it  only  in  tho  more  correct  Rhagnneurus.  Tlio  characters  of 
this  genus  aie  :  First  joint  of  the  antenna?  with  bristles  on  tlie  upjier  side  ; 
tlio  arista  of  the  anteuiiie  fealhereil  or  hairy;  lirst  joint  of  the  hind  tarsi 
with  a  bristle  ;  fourth  longitudinal  vein  twice  broken  at  right  angles,  with 
a  considerable  stump  of  a  vein  at  each  angle  of  the  fracture  ;  abdomen  of 
tho  male  a  little  compressed  laterally  ;  hypopygium  entirely  disengaged, 
as  in  Dolichopus.  Tho  figured  species  is  the  following:  — 
Rhagoneurus  iioli/rhromns  nov,  sp.  'J,  and  9  • — Viridis,  thoraco  violacpo- 

et  ciipreo-variegato,  fronto  violaceA,  antennis  rufls,  pedibus  llavis,  alis 

cinereis,  venis  transversis  non  infuscatis. 
%.  Facio  ochracea,  hypopygii  margino  supero  et  apice  flavis,  lamellis 

parvis,  alliicantibus,  teuuissimo  uigro-marginatis. 
5 .   Facie  alliida. 

Green  with  violet  and  coppery  spots  on  tho  thorax  ;   front  violet :   an- 

tenn.ne  red  ;   feet  yellow  ;  wings  gray  ;   the  transverse  veins  without  a 

dark  margin. 
^  .   Face  ochraceous  ;  upper  margin  and  tip  of  the  hypopygium  yellow, 

tho  small  lamellfe  whitish,  with  a  very  narrow  black  margin. 


iYn 


REMAUKS  ON  THE  flENERIC  CILVRAPTERS. 


S4t 


Tlio  pocuHnr  ornaments,  which  the  figured  males  of  IlygrcKeleuthus  and 
I»oli(.'li()iius  jiosHosH,  as  well  as  tlio  strong  swt^lling  of  the  <'()sta  liefore  tlie 
tip  of  tilt!  fust  hnigitu  linal  vein  in  llygroceleiitiius  are  not  geiK-r  e,  but 
merely  specilic  cliann.ters  wlii<h,  moreover,  do  not  hclong  to  tlic  females. 

To  the  scroii'l  i/rou)!  belong  tlie  genera  <iymnoi)ternus  (4),  I'araclius  (7), 
JVlastonenrus  (J),  Tachytrechus  (U),  (Jrthochile  (S),  Her.'ostomus  (1»), 
iSyliistroma  (H'))  Hyi'opliyllus  (11),  and  Ilaltfricenis  (111).  The  gi'nua 
Gyninopternus,  if  uiiderstooii  in  the  limited  sense  adopted  above,  dill'ers 
from  all  tliu  other  genera  of  this  group  by  the  parallelism  of  the  third  and 


9.   Face  wliitish. 

Long.  Corp.  0.17.     Long,  ah  0.17. 

!r*liining  metallic  green.  Front  bright,  violet-blue,  an  unia  yellowish- 
red  ;  tlio  pub(;scence  on  the  upper  side  of  the  liist  joint  1  alier  short  ;  the 
third  joint  rounded-ovate,  howevei  but  little  rounded  at  the  end  ;  shorter 
ill  the  femalu  thiin  in  the  male,  in  both  sexes  blackened  to  a  very 
small  extent  on  the  ujjper  margin  an<l  at  tlie  extr»'me  tip.  The  arista  of 
the  antennto  in  both  sexes  with  a  considerable  feathery  jjubescenco.  Vnrei 
of  tlie  male  not  v^']•y  narrow,  oclire-brownish  ;  the  face  of  the  fi'iuale  broad, 
whitish.  Cilia  of  the  inferior  orbit  yellowish,  L'pper  side  of  the  thorax 
with  copper-colored  spots  and  with  violet-blue  rtdlections  ;  the  former  are 
more  striking  in  the  male  than  in  the  female,  while  the  latter  are  visible 
either  on  the  liind  part  of  the  dorsum  of  the  thorax  only,  or  sjiread  on 
its  middle  more  towards  the  front.  Scutellum  violet-blue  with  bliie-i;n'en 
margins.  Abdomen  metallic  green,  often  coppery  upon  most  of  the  ujjper 
part,  black  at  the  incisures,  covered  on  the  sides  with  a  rather  stiikiiigly 
white  dust ;  the  hypopygium  rather  small,  its  second  segment  yellow 
aloii:;  the  margin,  which  is  turned  towards  the  venter,  and  at  the  tip :  its 
external  lamella)  scarcely  of  middling  size,  yellowish-white,  with  a  very 
narrow  black  margin,  on  the  edge  of  the  margin  a  little  jagged  and  beset 
with  crooked  black  bristles.  Coxic  yellow  ;  the  foremost  are  beset,  besides 
the  iisual  black  bristles,  with  short  and  fine  black  hairs  ;  the  outside  of  the 
middle  coxk  is  almost  entirely  covered  by  a  large  gray-black  spot.  F.'et 
yellowish,  even  plain  in  the  male  ;  hind  femora  with  a  bristle  before  the 
tip;  fore  tarsi  brownish-yellow,  about  as  long  as  the  tibiie  ;  mi(l<lle  and 
hind  tarsi  infuseated  from  about  the  tip  of  the  first  joint,  browiiish-black 
towards  the  end  ;  the  hind  tibi.-e  of  the  ni'le  without  gl.ilnous  spot  on  the 
hind  side;  the  first  joint  of  the  hind  tarsi  in  both  sexes  has  only  one  or  two 
strong  bristles  on  the  upper  side.  Tegulre  with  black  cilia.  Wings  tinged 
with  dark  gray  with  brownish-black  veins  ;  the  last  segment  of  the  fourth 
longitudinal  vein  is  interrupted  twice  at  right  angles,  and  has,  at  each 
interruption,  a  long  stump  of  a  vein,  as  the  other  species  of  this  genus; 
transverse  veins  without  any  trace  of  dark  margin  ;  in  the  male  the  costa 
has  a  slight  swelling  immediately  before  the  end  of  the  first  longitudinal 
vein. 

JIub.   Ceylou. 


I  ■ 


m^A 


i.:;i 


848 


Dll'TKHA  OK  NOllTII  AMKllirA. 


[I'AUT  ir. 


.;:!• 


•■Mj. 


I*  1'  ' 
I"  f  ' 


|i  ■/;  ■ 
I'  ■■ 


foiiilh  loiiu'ituiliiKil  veins  of  tlh'  wings  ;  it  Htiiiidrt  in  rather  cIoho  mintion 
to  till-  t'lMiiis  I>iili('lio|>u-(,  wliii-li  Iii-Iiiiil;s  to  tlit)  liist  gi'iiiip,  ililVt'is  fioiu  it, 
liowi'ViT,  not  only  liy  llic  want  of  Inistli-s  on  tiiu  Ilist  joint  of  tin'  l:lnil 
tiU'Hi,  liut  also  \iy  tin>  snialltT  si/o  of  its  spcciuH,  tliH  nliortness  of  tli«  llr.Ht 

joint  of  tlni  anti'iin.'i!,  ami  usually  liy  tint  niont  (listiiict  pnlM'sciMK (  tint 

arista;  mornover  tlio  lanmllii'  of  tin'  liypopyfiiuni  aro  usually  snialliT  ami 
not  jauut'il  at  tlie  eml.  Tliu  ^'cnus  Faraclius  is  ilistinuuisht'il  liy  a  piTii- 
iiatf  or  snlipt.'itinate  arista  of  tliu  nntunimi,  by  tin*  face,  narrowml  liclow 
j'Vcn  in  tin*  fcnn'iln,  ami  liy  tint  l^'fuliar  course  of  tint  fourth  lonnitmlinal 
vi'in,  the  cml  of  whieh  forms  a  curve  with  its  concavity  turned  hackwards. 
Closely  related  to  I'arailius  is  Felastoneurus;  the  distinction  between 
both  cenera  is  easy,  if  attention  is  ]iaid  to  the  essentially  dill'erent  conrso 
of  tho  fourth  longitudinal  vein,  to  the  very  muidi  nn)ro  bioad  face,  which 
in  also  more  convex  uimn  its  lower  part,  and  to  the  not  Bessilo  but  pedun- 
culated hypopygiuni  of  tho  species  of  I'elastoneurns,  whidi  have  tho 
feathered  arista  of  the  antenn.-e  in  common  with  the  species  of  l'ar;iclins. 
The  genus  TachytrechuB  is  very  easily  recogniz('d  by  the  great  length 
of  the  perpendicular  <lianieter  of  the  very  hairy  eyes,  by  tlio  face,  whicix 
is  narrower  towards  the  middle  but  bioader  towards  the  bottom,  and  reaches 
entirely  as  far  as  the  inferior  margin  of  the  eyes  ;  the  jialpi  are  also  com- 
paratively small  in  the  female,  and  tlie  fourth  longitudinal  vein  has  before 
the  middle  of  its  last  segnu-nt  a  gentle  tlexure,  from  which  it  converges 
towards  the  third  longitudinal  vein  ;  tin.'  figures  of  the  antuniuu  of  tho 
male  of  T.  nioechus,  which  remind  of  the  structure  of  the  antenna'  of 
Ilaltericerus,  are  an  exception  to  the  rule ;  however  a  similar  structure 
occurs  by  way  of  exception  in  the  genus  DoHcliopus.  The  genus  Ortho- 
cbile  is  so  much  distinguished  by  the  structure  of  the  proboscis  and 
of  the  palpi  as  also  by  tho  distance  of  the  tips  of  tho  third  and  fourth 
longitudinal  veins  from  tho  tip  of  tho  wing,  that  it  cannot  be  mistaken 
for  any  other  genus.  The  genus  Hercostomus,  to  which  is  to  be  ailded 
a  large  portion  of  those  species  which  in  my  previous  works  I  have  com- 
prised in  the  genns  Gymnopternus,  embraces  a  variety  of  organizations  and 
is  evidently  capable  of  a  subdivision  into  several  genera ;  in  its  whole 
structure  it  shows  the  greatest  resemblance  to  Cirymnoi)ternus,  but  in  all 
the  species  the  third  and  fourth  longitudinal  veins,  towards  their  ends,  are 
rather  strongly  converging,  while  in  the  species  of  Oymnopterims  they  are 
either  entirely  parallel,  or  show  but  a  very  slight  trace  of  convergency ; 
the  hypopygium  has,  In  its  structure,  a  great  similarity  with  that  of  Uoli- 
chopus,  but  in  some  species  the  internal  appendages  are  elongated,  brush- 
like and  hairy,  like  those  of  Ilypophyllus  and  Ilaltericerus,  which,  how- 
ever, is  also  the  case  with  some  few  species  of  Gymnopternus.  The  genus 
Sybistroma,  which  hitherto  remained  confined  only  to  a  few  species,  is 
nearest  to  the  genus  Hercostomus,  differs,  however,  by  the  scutellum  which 
is  much  clothed  with  hair,  by  the  peculiar  structureof  tho  face  of  the  female 
which  is  much  protruding  below,  and  by  the  peculiar  structure  of  the 
arista  of  the  malef.    The  species  of  Hypophyllus  are  easily  distinguished 


I  1 


4^V; 


1  : 


♦«*► 


UFMAUKH  ON  TMK  OKNKUIC  CIIAIIACTKRS. 


849 


liy  tlio  sliinilcr  HtiiK'ture  of  tho  wliolc  Ixuly,  by  tUi«  ImiKth  of  tlicir  hIcikIlt 
I'cft,  l>y  tlii'ir  jii'iliinciil.'itdd,  iisiiiilly  yt^llnw  liy|iti|iy,i;iiim,  wliiili  is  |(i(>- 
viilcil  witli  niirrnw,  liiu'iir  tixlcnial  aiii»'iiilagf.s  itinl  cloii.'.itf.l,  iiiuro  or 
liss  iiciiicilhitt'il,  liitHi'iiiil  nji|>fn(liii,'t's,  likmvirto  hy  tin;  iilwiivH  vfiy  pro- 
iiiiiH'iit  (l('V(!li>i)iiR'iit  of  tliu  Hint  joint  of  till)  nristii  of  tlii>  iintfiii\!i',  wliich 
is  (liircri!iit,  liowovtd',  in  dilleieiit  siM.'cifs ;  tlm  Mcutclluni  is  glaljiourt 
ainl  tlio  lower  jiart  of  tint  Icnialt!  faio  not  j)rotruilin,u'.  Tlio  Hpfuii's  <tf 
HaltericeruB  are  more  rolmst  than  tiio  niM'cics  of  llyiiopliyllns  ;  tin-  face 
of  tliti  main  is  very  narrow,  that  of  the  fcniiihi  very  hroail  ;  the  si'coiid 
joint  of  thu  .antiMina-  in  Imth  sexes,  especially  in  the  males,  is  rmli- 
mentary,  and  the  arista  very  elongated  in  the  latter  and  eiiian-'ed  at  its 
tip  into  a  lamella;  tin;  hyiMi|iygiuni,  attached  to  a  loni,'  peduncle,  and  its 
appendav't'S,  buar  tho  greatest  resemblanco  to  thoso  of  tho  sjiecies  of 
Hy]")lihyllus. 

To  the  above-named  genera  of  the  first  pronp  is  npi>emled  Dlostraciia 
(ll'i),  as  an  unomalnus  genns.  The  very  broad  face  in  both  sexes,  tho 
})ali)i,  mu(di  liirger  in  tiie  male  than  in  tlie  female,  the  very  small  thinl 
Joint  of  the  antenna-,  tho  incrassattfd  fore  femora,  the  rmuided,  bnt  nut 
imbedib'd  liypojiyuium,  with  its  \t.Ty  small  aiipimdaites  and  tho  lonu  nar- 
row wings,  with  tho  posterior  transverse  vein  very  close  to  the  margin — 
all  these  characters  render  this  genus  very  easy  to  recognize. 

To  the  Second  Sub-dlviaion,  which  is  distinguisheil  by  the  small, 
more  or  less  imbedded  hypopyginm,  belong  the  following  genera  :  Anepsius 
(14),  Argyra  (ir)),and  Syntormon  (ItJ).  In  Anepsius  the  second  Joint  of 
the  antenna)  has  the  usual  transverse  form,  and  the  arista  is  inserted  very 
close  to  its  basis  ;  tiie  third  Joint  of  the  antenna'  sliows  a  distinct  puljes- 
cenco  ;  the  first  longitudinal  vein  is  short,  the  fourth  jiarallel  with  the 
third;  the  abdomen  of  tho  male  is  laterally  compressed.  Tho  Jelation- 
sliip  between  Anepsius  and  the  genus  t5ymi)ycnus,  wliich  belongs  to  the 
Second  principal  division,  cannot  be  mistaktMi,  though  the  distinct  imlies- 
cence  of  the  first  joint  of  the  antennic  distinguishes  it  very  easily  from 
the  other.  The  genus  Argyra  is  distinguished  by  tho  transverse  form 
of  tlie  second  and  the  rather  considorablo  size  of  the  third  joint  of  tho 
antenna?,  its  subai)ical  arista,  the  broad  wings — particularly  towards  tho 
basis,  the  length  of  the  first  longitudinal  vein,  its  distance  from  the  eosta 
and  tho  inflection  of  tho  fourth  longitudinal  vein  ;  to  these  characters 
may  be  addeil,  in  most  of  tlie  species,  tho  delicate,  but  striking  silvery 
white  tomentum,  spread  over  a  large  part  of  the  body.  Argyra  is  closely 
related  to  Leucostola,  the  first  Joint  of  tho  antenn.'c  of  whidi,  liowover,  is 
glabrous  on  the  upper  side.  The  genus  Syntormon  dilters  from  all  tho 
other  genera  of  the  whole  first  jirincipal  division  by  tho  form  of  the  secnmd 
joint  of  the  antennjp,  whicli,  on  its  inner  side,  overlaps  the  third  joint  in 
the  shape  of  a  thumb  ;  tin;  face  of  the  male  is  narrow,  that  of  the  female 
broail  and  protruding  below  like  a  roof;  the  arista  of  the  antenn;e  is  com- 
pletely or  almost  completely  apical ;  the  third  longitudinal  vein  is  parallel 
or  almost  so. 


;ij 


m 


t,:'i 


'!',,.» 


TI 


;}')(> 


DIPTKUA  OF  NOHTFl  AMKIUOA. 


[PAllT  II. 


The  SECOND  PRINCIPAL  DIVISION  of  the  Doliiliopoilid.T  U 
(lividt'cl,  ;ic('()r(liiig  to  lUe  sliajK!  of  the  tliird  joint  of  tliH  a'lttMiiui',  into  liro 
sii!'-ilin'yioii^ ;  tlio  pcnora  of  ilw  JirsI  .suli-dicision  (No.  IT-liii)  liavo  tliis 
joint,  citlit'i-  in  both  sexes  or  at  least  in  tiie  male,  jwiiited  anil  provided  with 
an  apical  arista  ;  in  the  geniM'a  of  tho  seroMl  siili-dirisinn  (No.  -4-44),  it  is 
short  in  hotli  sexes,  and  if  it  should  be  somewhat  elongated  in  tho  male, 
it  is  not  jioiiited,  and  the  arista  is  either  dorsal,  or,  at  the  utmost,  sub- 
ajiiial. 

The  genera  of  the  First  Sub-division  are  divided  into  hm  i/rou/is.  To 
tht'  fir^il  iiriiii/i  b(d(ing  those  genera,  the  posterior  transverse  vein  of  whiidi  is 
distant  fiom  the  margin  of  tin;  wing.  'J'hey  are  the  following:  ^ynartlirus 
(17),  Systenus  (IS),  Khaphium  (111),  Xiphandrium  (2(i),  Porphyrops  (121), 
ami  Smiliotus  (-:'>).  Synarthrus  shares  with  Syntormon  not  only  tho 
peculiar  structure  of  the  second  joint  of  tho  antenna>,  but  also  the  remain- 
ing characters,  with  tho  single  exception  of  tlie  first  joint  of  tho  antenna', 
which  is  glabrous.  Systenus  strikingly  dill'ers  from  all  tlie  other  genera 
of  the  group  by  the  pointed  abdomen  and  the  very  p(  dunculated  hypo- 
pygium  of  the  male;  to  its  distinguishing  characters  may  also  be  reckoned 
t\n\  distinct  jjubescence  of  the  third  joint  of  the  antenua>,  aud  the  remark- 
ably sharp  dividing  line  between  the  lower  j)art  of  the  face  and  the;  ujiper 
one.  Rhapliium  stauds  iu  close  relation  to  tho  two  following  genera,  is 
liowever  ilistinguislied  from  tlmm  by  tho  very  elongated  antenna",  even  iu 
females,  aiul  by  the  still  more  considerable  stoutness  of  the  female  pro- 
boscis ;  11'  t, 'cover  from  Xiphandrium  it  is  distinguished  by  a  less  slender 
structure  of  the  body,  a  much  strongt>r  pubescence,  and  a  stronger  llexuro 
of  the  fourth  longitudinal  vein.  The  species  of  Xiphandrium  ha  >e,  like 
tlie  species  of  I'orphyrops,  only  in  the  males  an  ehuigated  third  joint  of  the 
antenna',  in  the  fenuiles  it  is  short;  their  dill'erence  consists  in  u  greater 
slenderness,  less  pubescence,  and  less  llexure  of  the  fourth  longitudinal 
vein  ;  moreoviu-  the  largest  species  of  Xiidiandrium  are  scarcely  e.jual  in 
the  len.;,th  of  their  body  to  the  smallest  s|iecies  of  l'ori)hyrops.  The  dis- 
tinguishing characters  of  the  genus  Porphyrops  become  manifest  from 
what  has  just  been  stated  about  the  two  preceding  genera.  The  geiius 
Smiliotus  has  the  antenna)  of  eipial  size  and  form  in  both  sexes  ;  tiiey 
have  on  the  under  side,  from  the  tip  almost  to  the  base,  a  distinct  ex- 
cision ;  the  face  of  the  male  is  broad,  and  its  palpi  are  as  large  as  those 
of  the  female  ;  linally,  the  abdomen  shows  externally  one  segnu'Ut  h'ss 
than  the  related  geiiera  ;  the  feet  are  comjiaratively  short  and  rather  vigor- 
ous ;  the  small  hypopygium  is  deeply  imbedded  and  its  appendages  ans 
often  dillicult  to  perceive. 

To  the  secoiiil  (jroii/i,  which  is  characterized  by  a  close  proximity  of  the 
transverse  vein  to  the  ])osterior  margin  of  the  wing,  belongs  the  only  genus 
Aphrosylus  (-!5)  ;  the  third  joint  of  its  antenna'  is  but  little  elongated, 
but  pointed  ;  the  ])endant  ])al[)i  are  larger  in  the  male  than  in  the  female  ; 
the  proboscis  is  beut  towards  the  chest,  the  face  is  narrower  above,  and 


AiiT  ir. 

ilid.'c  is 
into  iirt, 
ivt!  this 

'I  Willi 

•1),  it  is 
inalc, 
St.  suh- 


llEMAUKS  ON  TIIK  (iKNKIlIf"  ClIAItACTKliS, 


351 


and 


tlio  eyes  avo  excised  near  tlie  anteiiii.e  ;   the  feet  have  renLrii  hiisti 
the  first  joint  of  all  tlie  tarsi  is  niindi  hnitrer  tlian  tin-  second. 

Aniont;  all   j^eiKM'a  of  the  Second   Sub-division    I'silnpus  is  distin 


giiished  hy  tlie  slender  structure  of  its  body,  and 


■iailv  of  its  feet,  its 


very  hroad  and  more  or  less  excavati'd  front,  the  sniallness  of  its  aiilcun.e, 
and  linally  hy  its  foiiitli  longitudinal  vein,  which  is  jiroviileil  with  ;'  pos- 
terior iniiiitdi.  1  have  assii,'neil  to  it  a  jiosition  altoLrether  at  t he  end  id" 
the  seconil  sub-(livis'"n,  and  will  revert  to  it  there.  'I"he  other  treneia  of 
this  sul)-di vision  may  he  distriluited  into  Urn  i/rintjis  accord ini;  to  the  stnnt- 
ture  of  the  thorax.  To  the  first  gronj)  helonj^  those  u'eiiera,  the  ii]i]ier  side 
of  the  thorax  of  \vlii(di  is  convi^x,  as  far  as  the  sciitellum  (No.  lid-IlD)  ;  to 
the  secoml  tiiose,  where  the  njiiiei'  side  of  tluf  thorax,  het'ore  the  s<-uii'lluni, 
bears  an  inclineil,  nmre  or  less  concave,  area  (No.  4(i-d;i). 

The  irenera  IxdonLrini;  to  the  flist  group,  and  possessini^  a  sixth  Ioiil;!- 
tudinal  vein,  form  ilw  jirxt  snh-yruiip  ;  those  whero  this  vein  is  wanting, 
form  the  sccimd  siih-i/riiii]), 

Tho  JirsI  sidi-iiroHj)  contains  either  such  genera  as  have  the  transverst* 
vein  not  close  to  tho  posterior  margin  of  tin!  wiu;,',  or  su(di  where  an 
approximation  of  tiiat  kind  takes  place  in  ;i  striking  manner.  'J'he  genera, 
Avliert-  theie  is  no  striking  aiiproxiniation  of  the  jiosterior  transverst;  vein 
to  tlie  margin  of  the  wintr,  are:  Thinoi)hilus  (-4),  I'eodes  (2;')),  Neniato- 
]iroctus  C-ii),  Leucostfda  (27),  l^utarsus  (-^),  Diaphorus  (2!1),  J.yroneuius 
(:5n),  Chrysotiis  (151),  Teuchophorns  (Ii2),  Sympycnns  (:!4),  Campsicnenius 
(315),  and  I'lagioneurus  {'■ii'i).  Thinophilus  has  the  small  and  hut  littlo 
imbediled  hypopygium  in  common  with  I'eodes  (in  all  the  other  genera 
that  belong  here,  it  is  inucli  more  imbeihhid)  ;  it  dill'ers  from  I'eodes  by  the 
structure  of  the  face,  whicli,  in  botli  sexes,  is  hroailer  below,  and  has  an 
angular  margin;  by  the  large  i)alpi  of  both  sexes,  and  the  very  small  size 
of  the  interior  appendages  of  the  hypopygium  ;  the  first  two  joints  (jf  tho 
ant'Muue  are  small,  the  third  somewhat  in  th(,'  shape  of  a  lens,  and  tho 
arista  dorsal ;  the  last  segment  of  tlu;  fourth  longitudinal  vein,  towards  its 
end,  is  parallel,  or  almost  so,  to  the  thinl  longitudinal  vtdn  ;  the  fi'ct  of  tho 
male  are  usually  variously  adorned.  The  structure  of  the  body  o(  Peodea 
resembles  in  general  that  of  Thinopliilus  ;  the  structure  (d"  the  antenn.'u 
and  of  tho  winu'S  is  also  nearly  the  same,  only  the  j)ai'all(dism  of  the  third 
and  fourth.  Ion  ifudinal  veins  is  still  iimre  complete  than  in  most  of  tho 
species  of  Thin(i[iliilus  ;  both  of  the  interior  a|i|iendages  of  the  hy]ioj»vu;iuiu 
form  a  lartre  horny  triceps;  the  tarsi  of  the  male  of  the  only  s|iecies 
hitheito  known  an-  plain.  The  species  of  Nematoproctus,  in  the 
whole  structure  of  the  body,  are  nearest  the  species  of  I'orjdiyrops  ;  they 
can  be,  however,  easily  distintniished.  from  them  by  the  roundeil,  and  in 
both  sexes  small,  thinl  joint  nf  the  antenme.  and   by  the  arista,  whic  h   is 


inserted  in  tin!  neiglitiorliood  of  the  basis.     Tliev  are  b 


<s  close  IV  re  I  a 


ted 


ill  the   u'enus   I,eucoslola,  be 


the  elongation  of  the  first  lontdtudinal 


vein,  the  b(o/id  shape  of  the  wiuu's,  and  the  subapical  position  of  the  aiista 
lire  wanting  in   tliein  ;  tlie  tiHine  characters  and  the  glabrousness  of  tho 


WV 

''V.  ,1 


■'■  J 


■  1 


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DIPTKKA  OF  NOUTII  AMKIUCA. 


[I'AI'.T   If. 


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first  joint  of  tlu'ir  aiiteiiiiin  distinguish  thi>in  from  tlio  species  of  Artryra. 
The  gt'iius  Leucostola  .stands  to  Argyra  in  tho  same  relation  as  Synar- 
thriis  does  to  Syntornion,  that  is  to  say,  it  dilTers  from  it  only  by  the  first 
joint  of  tlie  antenna;  being  without  hairs  ;  the  considerable  si/e  of  the 
thin!  joint  of  the  anttMina',  the  subajiical  jxisition  of  the  arista,  the  great 
lireadtii  of  the-  antenn.'u  towards  the  b.-sis,  the  consicb-rable  length  of  the 
lirst  lougituilinal  vein  and  its  great  distance  from  tlie  eosta,  are  charac^eis 
shared  by  Argyra;  moat  of  the  species  of  I^cucostola  have  also,  likit  the 
siiccies  of  Argyra,  a  delicate,  almost  silvei'y  whitt;  tomentum,  wiiicli  covers 
a  considerable  portion  of  tlie  body.  Eutarsiis  is  very  near  to  Iiiaphmus  ; 
the  dillerence  is,  that  the  former  has  tiie  third  joint  of  the  antenna.'  some- 
what larger  and  that  the  transverse  vein  is  a  little  more  removed  from  the 
jiosterior  margin  of  the  wing  ;  moreover  the  face  of  the  males  of  luitarsus 
in  narrower,  the  bristles  of  the  imbedded  hypopygium  are  less  >trikintr, 
the  lii'st  joint  of  the  hind  tarsi  is  shoiter,  and  the  pulvilli  of  the  fore  taisi 
are,  alth(}Ugh  also  enlarge<l,  not  so  elongated  as  in  l)ia[)h()rus.  'J'lu;  genus 
Diaphorus  is  rei)resented  in  North  America  by  particularly  varied  foiins  ; 
its  (listiiiction  from  luitarsus  has  been  explained  above;  from  LyrontMirus 
it  dill'ers  by  the  altogetlua  dilferent  neuration  of  the  wings,  from  Chrysotus 
by  the  greater  slenderness  of  the  whole  body,  and  esjiecially  of  the  feet, 
aii'l  the  comparatively  hniger  and  generally  also  proportionally  nairowcr 
wings  ;  moreover  the  structure  of  the  head  is  dill'erent,  as,  whiii;  the  eyes  of 
the  males  of  Diapliorus  are  either  contiguous  above  the  antenn;e  or  at  least 
are  separated  hy  an  e^aially  broad  front,  those  of  the  males  of  Chrysotus 
are  sonu'times  co.'iif. .  jus  below,  but  never  above  the  antenna',  and  the 
front  is  always  consiuorably  widened  above  ;  this  dillerence  in  the  structure 
of  the  front  exists  also  in  tlie  females  of  both  genera;  finally,  the  males  of 
]<iaphoius  distinguish  themselves  by  the  remarkable  ])rolongatioii  of  the 
fore  tarsi  or  of  the  fore  and  hind  taisi,  and  by  the  iiarticularly  striking 
manner  in  which  the  small  imbedded  hypopygium  is  provided  with 
bristles,  whi<di  characters  are  not  found  in  the  species  of  Chrysotus;  the 
neuration  varies  in  the  dill'erent  species  of  Diaphorus  in  couse(|uenco  of 
several  modifications  in  the  i)osition  of  the  posterior  transverse  vein;  in 
no  species,  however,  is  this  vein  ajiproxiniated  to  the  posteiior  margin  of 
the  wing;  the  end  of  the  last  segment  of  the  fourth  longitudinal  vein  is 
sometimes  cut  oil'  from  the  preceding  jiart  of  it  and  juished  nearer  to  the 
anterior  margin  of  the  wing,  so  that  both  parts  are  eitlur  comjiletely  sepa- 
rated from  each  other  or  at  least  connected  by  an  indistinct  rudiment  of  a 
vein,  as  the  illustration  of  the  wing  of  Diaph.  inteiruptus  shows  it.  The 
genus  Lyroneurus  has  a  suiiertlcial  reseiiiblance  to  Diaphorus  in  the 
structure  of  the  body,  differs,  however,  strikingly  by  the  large  wings,  with 
a  uioi'e  or  less  apparent  greasy  lustre,  by  the  cosfa,  which  is  usually 
tlii(diened  in  both  sexes,  or  at  least  in  the  male,  to  a  very  great  extent  ;  by 
the  end  of  the  third  longitudinal  vein  being  strongly  turned  backwards, 
and  by  the  wide  ^.pace  between  the  fourth  and  the  third  longitudinal  veins  ; 
the  hypopygium  is  usually  less  provided  with  bristles  than  in  the  species 


REMARKS  ON  THK  GENERIC  CHARACTERS. 


353 


^              ''WW 

'                 '  ] 

I                 ^  ■        ■  1 

f              ■  '         I 

of  Diapliorus  ;  the  males  of  Lyroiiennis,  known  to  me,  show  no  elongation 
of  the  jmlvilli  of  the  fore  tarsi.  The  genus  Cbrysotus  contains  only 
small,  mostly  briglit-green  species,  which  cannot  he  mistaken  for  any  other 
of  the  following  genera,  and  which  are  sufficiently  distinguished  from  I)ia- 
phorus  hy  the  already  mentioned  characters  ;  the  statements  made  a  hove 
In  regard  to  the  shape  of  the  front,  the  absence  of  bristles  ujion  the  hypo- 
pygium,  and  the  absence  of  tlie  elongation  of  the  pulvilli  on  the  fore  tarsi 
of  the  male,  will  help  to  recognize  whether  a  given  species,  unless  its 
female  alone  is  known,  is  to  be  reckoned  to  Chrysotua  or  to  iJiaphorus  ; 
as  to  the  female,  the  structure  of  the  front,  the  form  of  tlie  wings,  and  the 
greater  or  smaller  slend(?rness  of  the  feet,  liave  to  guid(!  us  in  its  location. 
Striking  is  tlie  very  different  form  of  the  third  joint  of  the  antenna?  of  the 
ditTerent  .species  of  Chrysotus  in  North  America.  The  species  of  Teucho- 
phorus  resemble  more  or  less  the  smallest  species  of  Chrysotus,  are  how- 
ever very  easily  distinguished  in  the  male  sex  by  the  soniewhat  laterally 
compressed  abdomen,  by  the  feet  which  are  beset  with  single,  scattered, 
.strong  bristles,  and  by  the  crooked  and  variously  adorned  hind  tibifB  ; 
moreover,  in  all  the  known  males  of  Tenchophorus  there  is  a  large  black 
swelling  on  the  costa  before  the  tip  of  tlr,  first  longitudinal  vein,  wliicli  is 
altogether  an  exception  in  the  genus  Chrysotus.  More  attention  is  neces- 
sary in  order  to  recognize  the  females  of  Teuchophorus  ;  the  best  guide 
in  this  case  is  the  steep  position  of  the  posterior  transverse  vein,  the  anterior 
end  of  which  is  nearer  to  the  basis  of  the  wing  than  the  posterior  «nd,  and 
the  comparatively  small  antennae,  the  arista  of  which  is  somewhat  less 
approximated  to  tlie  apex  than  in  most  of  the  species  of  Chrysotus.  The 
genus  SympycnuB  contains  only  small,  mostly  but  little  shining  species, 
which  are  characterized  by  the  smailness  and  the  distinct  pubescence  of 
the  third  joint  of  the  antennae,  the  insertion  of  the  arista  in  the  vicinity 
of  its  basis,  the  laterally  compressed  abdomen  of  the  males,  the  not 
elongated  metathorax,  and  the  wings  being  more  or  less  narrow-d  towards 
the  basis  ;  they  have  the  greatest  analogy  to  the  species  of  Anepsius,  the 
first  joint  of  the  antennae  of  which,  however,  is  clothed  with  hair;  fioin 
Campsicnemus  they  are  distinguished  by  the  not  elongated  metathorax, 
by  the  abdomen,  which  is  longer  and  not  flattened  from  above,  and  by  the 
face,  which  is  narrowed  towards  the  bottom  ;  the  end  of  tlie  fourth  longi- 
tudinal vein  converges  somewhat,  in  the  Kuropean  species,  towards  the 
third  longitudinal  vein  ;  in  the  North  American  species  it  is  parallel  with 
it  or  almost  so.  (The  want  of  the  small  transverse  vein,  and  of  the  sixth 
longitudinal  vein,  which  occurs  in  a  number  of  the  impressions  of  Tab. 
VI,  are  merely  mistakes  of  the  engraver,  which  were  discovered  too  late 
for  correction.)  Campsicnemua  is  distinguished  by  its  face  attenuated 
upwards,  the  distinctly  elongated  metathorax,  and  the  short  and,  in  both 
sexes,  much  flattened  abdomen  ;  the  third  joint  of  the  aii-nn.-e  is  small,  or 
rather  small,  and  in  most  of  the  species  somewhat  pointed  ;  the  dorsal 
arista  is  inserted  in  rather  close  proximity  to  the  basis  ;  the  fourth  longi- 
tuilinal  vein  is  always  parallel  to  the  third,  and  runs  before  its  middle  over 
23 


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1'  ♦  '! 


354 


DIPTEHA  OF  NCtUTH  AMEIUCA. 


[PAUT  If. 


J' 


a  distinct  convexity  of  the  wing.  Tlie  nialf.s  .-ire  usually  diatinguislied  l,y 
strikint;  ornaments  on  tlieir  feet,  especially  on  the  middle  feet.  The  Hpecifs 
of  PlagioneuruB  are  altogether  distinct  on  account  of  tlie  very  diat'onal 
position  of  the  posterior  transverse  V(dn  ;  otherwise  their  neuration  is  very 
near  to  that  of  Pelastoneurus,  while  the  glabrousness  of  the  first  joint  of 
the  antennfe  renders  it  utterly  impossible  to  mistake  them  for  any  specits 
of  the  latter  genus. 

To  the  second  sub-group,  embracing  those  genera  the  transver.se  vein  of 
which  is  strikingly  approximated  to  the  posterior  margin  of  the  wing, 
belong  the  following  genera:  Liancalus  (Sf)),  Scellus  (37),  and  Hydro- 
phorus  (^58).  Liancalus  is  easily  distinguished  from  Scellus  and  IlydK- 
phorus  by  ah  the  femora  being  slender  and  unarmed.  In  the  species  of 
Scellus  the  fore-femora  are  beset  on  the  under  side  witli  rather  strong 
bristles,  catching  into  a  row  of  similar  bristles  of  the  fore  tibire,  and  the 
third  and  fourth  longitudinal  veins  are  rather  strongly  convergent  toward 
their  ends,  while  the  species  of  Hydrophorus  have  only  on  the  undir 
side  of  the  fore-femora,  t(iwards  tlie  liasis,  a  few  elongated  thorn-likn 
bristles  ;  the  under  side,  however,  not  only  of  the  fore-femora,  but  also  ct 
the  fore  tibi;e,  is  beset  only  with  short  bristles,  and  the  third  and  fnuitii 
longitudinal  veins  are  parallel  towards  their  ends,  or  almost  so. 

To  the  next  following  genus,  Achalcus,  I  have  assigned  this  position  on 
account  of  the  general  structure  of  its  body,  which  led  me  to  suppose  tlie 
existence  of  a  relationship  between  it  and  the  following  genera  ;  I  also 
presume,  therefore,  that  the  structure  of  the  dorsum  of  the  thorax,  which 
I  have  not  been  able  to  ascertain  positively  in  any  of  the  few  specimens 
belonging  to  ine,  wir,  when  found  out,  justify  the  location  I  have  assigned 
to  the  genus.  In  general  the  species  of  Achalcus  may  be  easily  dis- 
tinguished, as  the  total  absence  of  the  sixth  longitudinal  vein  is  a  cha- 
racter peculiar  to  tliem ;  the  species  hitherto  made  known  are  of  a  non- 
metallic  color,  and  of  a  very  small  size. 

The  genera  belonging  to  the  second  yronp,  the  thorax  of  which  lias  on 
its  posterior  part  a  more  or  less  concave,  sloping  surface,  are  the  following  : 
Medeterus  (3iO,  Chrysotimus  (41),  Xanthochlorus  (42),  and  Saucropns 
(43).  Medeterus  differs  essentially  fiom  the  otlier  three  genera  by  tl  e 
apical  position  of  the  arista,  the  very  large  size  of  the  proboscis,  and  the 
totally  disengaged  hypopygium.  The  genera  Chrysotimus  and  Xantho- 
chlorus  contain  only  small  species,  and  are  easily  distinguished  1  y  their 
coloring,  which  is  either  entirely  yellow,  or  in  part  yellow,  in  part  metallic- 
green  ;  Chrysotimus  is  easily  distinguished  from  Xanthochlorus,  by  the 
subapical  position  of  the  arista  and  by  the  mmh  smaller  and  ind)eddeil 
hypopygium  ;  with  Xanthocdilorus  the  position  of  tlie  arista  of  the  anteiniie 
is  dorsal,  and  the  swollen  and  rather  disengaged  hyj)opygium  is  directed 
backward  so  as  to  assume  the  appearance  of  a  prolongation  of  the  abdomen 
of  the  male.  The  species  of  Saucroprs  a>-e  of  a  more  considerable  si/e 
than  the  species  of  Chrysotimus  and  Aaiitii,  l>u/rus,  and  their  feet  are 
comparatively  longer ;  the  second  j>iir.  of  viie  uutK^nr.,o  somewhat  differs 


M 


RKMAUKS  ON  TIIK  (ip:Ni:i?lC  CIIAKArTEIlS. 


355 


from  the  usual  tiaiisver.'e  foiiii,  as,  on  the  inside,  it  reaclifS  a  little  over 
tlie  third  joint;  the  ari^ta  is  dorsal;  the  sixth  longitudinal  vein  runs  as 
far  as  the  margin  of  the  \.'ing  ;  the  course  of  tlie  last  segment  of  tlie  fourth 
longitudinal  vein  varies  in  the  dilFerent  sj)ecies,  nevertheless  it  always 
shows  a  distinct  convergeucy  towards  the  third  huigitudinal  vein;  the 
first  joint  of  the  hind  tarsi  is  always  consjdeiahiy  shorter  than  tlio  scioml. 
The  color  of  all  the  species  is  either  entirely  yellow,  or  reddisli-yellow,  i>r 
partly  so. 

The  genus  Psilopus  (-44),  closing  the  series,  has  the  last  segment  of 
tlie  fourth  longitudinal  vein  i)rovideil  with  a  posterior  branch;  this  cha- 
racter is  not  wanting  in  any  of  the  American,  European,  or  African  species 
that  are  known  to  nie  ;  in  some  South  Asiatic  species,  however,  it  is  repre- 
sented only  by  a  fold  of  the  wing,  which  sometimes  is  very  indistinct. 
Besides,  the  species  of  Psilopus  are  very  easily  recognized  by  the  slender- 
ness  of  the  wliole  body  and  especially  of  the  feet,  by  the  very  broad,  more 
or  less  excavated  front,  by  tlie  small  antenn;e,  provided  with  a  long,  thin, 
dorsal  or  subapical,  rarely  almost  entirely  ajiical  arista,  and  by  the  entirely 
disengaged  hypopygiura.  In  the  living  state  they  keep  the  wings  divari- 
cated, which  gives  them  an  entirely  ditfereiit  aspect  from  all  other  genera. 
The  males  have  their  feet  variously  adorned,  and  in  some  species  they  are 
distinguished  by  a  structure  of  the  wings  peculiar  to  them. 


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I  N  D  E  X. 


il 


Achalcna,  2'J7 
Agoiiosoma,  230 
Anepsius,  123 
Aplirosylus,  148 
Argyra,  123 
Argyra  albicans  Lw.,  125 

albiveiitris  Lw.,  128 

calceata  Lw.,  131 

calcitraiis  Lw.,  130 

cyliiuirica  Lw.,  132 

diaphana  Fbr.,  12(j 

miuuta  Z-!/.'.,  12!) 

nigripea  Lw.,  127 

Campsicnemus,  193 

Campsicnenius  claudicans  Lw.,  194 
hirtipes  Lw.,  1!)3 

Chrysotiiuus,  22U 

Clirysotimus  flelicatus  Lw.,  222 
pusio  Aw.,  221 

Clirysotus,  171 

Chrysotus  abdominalis  .9'///,  172,  291 
ailinis  Lw.,  17S 
auratus  Lw.,  183 
coiiciiniarius  6'f(//,  172, 291 
cornutus  Lw.,  174 
costal  is  Lw.,  179 
discolor  Lw.,  1S2 
inuerus  HV^.,  172,  308 
longimamiri  Lw  ,  17r) 
mibiliis  S<i;/,  172,  291 
obli(|iuis  /.«'.,  17ii 
pallipes  A(r.,  1S3 
jiicticoniis  Lw.,  184 
subeostatus  A/c,  181 
validus  Lw.,  17r) 
viridifemora   Mnci/,,  172, 

298 
vividus  Z/W.,  178 

Condylostyluri,  230 


DasypsilopsuH,  230 

liiaphoius,  15t! 

Diaphorus  iiiterruptns  L,w.,  1(58 
laniellatus  Lw.,  1(55 
leucostouius  /,«'.,  lG(j 
iiiuiidus  Aw.,  1()1 
opaous  I.w.,  1(50 
soilalis  Aic,  lii3 
si)ectabilis  Lw.,  lt!2 

Diostracus,  120 

Diostracus  prasinus  Lw.,  121 

Doli.diopus,  18,  323 

Dolichopiis  abdominalis  Sai/,  20,  292 
aeuniinatns  Lw.,  34 
adjacens  \V/L,  22,  312 
adjustus  Willi.,  1() 
allinis  U7/,-.,  21,  310 
albiciliatus  Lw.,  31 
batillil'er  Lw.,  45 
bifractus  A(r.,  53 
bifroiis  117/,-.,  20,  301 
breviiiianus  Lw.,  39 
brevipeiinis  Mi'i'j.,  37 
clirysostoinus  Lw.,  07 
ciliatiis  Wlh.,  31,  312 
coorci'iis  II7/,-.,  22,  312 
coinatiis  Lir.,  (59 
conlinis  M7/-.,  23,  315 
confusiis  Ztt.,  71 
consols  ir//,.,  21,  302 
conteiininus  U 7/., 23, 31 5 
continueiis  ir//t.,21,3n2 
coiitigmis  U7/..,23,  314 
cupit'us  Siiji,  515 
cupriniis  Wiiil.,  55,  311 
disc.'ssus  Wlk.,  23,  314 
discifer  Stmni.,  71 
distractus  IKM.,  23,  313 
doryceriis  Lii\,  32(5 
t'udaLtvUis  A«-.,  4G 

■(  357  ) 


(.v'.l:       j 


-       II- 


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INDEX. 


iiliir 


H; 


I'cliioiiitiis  Sin/,  '2W 

liiiiiii.i  ir/A.,  L:-J,  ;n3 

fiilvi|M's  A(('.,  til 
finiditor  /.I/".,  0(5 
triiitiis  A»-.,  21> 
f;i(i'iil;iii(lirtis  Z//.,  20 
liast.'itiis  /,((■.,  f)!) 
lifl.HS  ir//-.,  21,  302 
lit!ti'i()inniius   Miini.,  20, 

2i)!l 
incismalis  l.w.,  74 
iii.-pliis  117/.:.,  21,  303 
imisiis  H7/,-.,  24,  318 
lanu'lliii.-s  U7/-.,21,  311 
Laticdiiiis  Lie,  21) 
Idljatiis  1,11'.,  72 
loiii.'iiiiaiius  />!('.,  38 
liiiiuipciiiiis  Aw.,  .'')7 
hitciptMiiiis  I  in.,  .')] 
luaculiiit's  ir//-.,21,303 
inclanoctM'U.s  l^iv,,  330 
mid  us  Aw.,  41 
obscuius  Sui),  20,  2!'0, 

2tl(j 
ovatus  Aiw.,  3.5 
jiachyciit'iiuirt,  f,w,,  35 
]ialu>stiii;us  A«'.,  328 
patcllatiis  Mill).,  71 
pcmiitar.sis  /'«//.,  (JO 
jilmiiipes  Srn/i.,  tjt) 
jiluiiiitarsis  /•>(//.,  37 
pijeu.stus  A((i.,  (i8 
puUdier  117^-.,  21,  304 
quadrilauiellatus,    Lw., 

331 
ram  iter  /^w.,  52 
reinotius  ]V/k.,  24,  317 
rufK'oriii.s  Lw.,  03 
scapularis  Aw.,  ()4 
suoparius  I.ir.,  70 
scparatus  H7i-.,  24,  31(5 
seiiuax  U7/.-.,  24,  317 
setit'er  /jr.,  30 
Betdsus  A(('.,  73 
sexaiticulatus  A?/".,  02 
soccatiis  \V/I.:,  24,  317 
SOCMIIS  Aw.,  40 
6]i!fndidiis  Aic,  44 
Sjileiididuliis  A«'.,  327 
Btilioiliaturi  A»'.,  42 
taiiyjius  Ai/'.,  71 
ft'iicr  Aw.,  4!> 
teriuiiiatiis  \Vlk:,2-i,  310 
li'liioiis  Aw.,  33 
fdlr.-^ilM  Ah'.,  47 
linif.'isidiitim  .'-Vn/,  28? 
Tun'iilMlis  tw.^  5lj 


Doliuhoiniri  variiis  H7/.-.,  21,  304 
vittatiis  Am'.,  55 
xantliDciieiiius  Lw.,  'M 
ziczac  iri'd/.,  10 

Knrostomenis,  230 

I'liit.iistis,  153 

Miitaisus  tMiues  Lir.,  154 

Oyninojitenius,  75,  332 
(iyiuiioptuniu.s  alliict'ps  Aw.,  85 

l)ail)atulus.  Aw.,  82 
c)ialt:(M;hrii.s  Lw.,  335 
coxalis  /.UK,  335 
cra.ssic.'uida  Aw.,  U5 
dtdiiiis  Aw.,  !»5 
di'.spicatus  /.!.•.,  00 
dirtitdii.^,  /jW.,  ill 
exiguii,>i  A(/'. ,  337 
exilis  Lw.,  ^4 
fiiiilniatun  /.»).,  80 
tlavu.s  Aw.,  80 
fieiiiH'iis  A»'.,  88 
liiiiiiilis  y,w.,  330 
lieviiiatus  Aw.,  87 
leiicospiliis  Lav.,  99 
huiitVr  Aw.,  89 
nieiii>cus  Aic,  330 
inimUus  Aw.,  90 
iiigriliailuirt  Aw.,  91 
op;i(;us  Aw.,  93 
parvictornid  Aw.,  92 
politus  Aw.,  94,  334 
pusillu.s  Aw.,  334 
scotias  Lw.,  81 
ppectaldlis  Aw.,  85 
sulidilatatus  Aw.,  80 
suhulatus  Lw.,  80 
tristis  Aw.,  83 
ventralis  Lw.,  97 

naUericeni.s,  119 
Ilei'costoiiius,  11(5 
Heicostouius  unipolor  Lw.,  117 
HtHei'opsilopus,  230 
llydropliorus,  211 
llydropliorua  alboflorens  TT7/-.,  216 
chrysoloiiiis   IK//-.,  215 
glalier  \V//c.,  215 
iiiiiotaturf  /.w.,  212 
notatus  /iell.,  305 
parvus  Aw.,  210 
j)irata  Aw.,  214 
I  spiiiitnanus  Zilt.,  .3(^5 

'  viridiHos   Wlk.,  215 

,  Hygroc(d«utlins,  17 
I  llyijrdctdcutlnis  latipes  Lw.,  17 
'  ll/pi)iiliyllusf  US 


INnKX. 


.i.j ; 


Leiicostola,  IT)! 

L<'ucnst()la  fiiiKulata  Lw.,  IfiS 

LiaiicaliiM,  l!t"> 

liiaiicahis  gcmialiH  Lw.,  V,)\) 

liyroiKUinirt,  liil> 

Lyroiieiirua  cieiuIeMcens  Ait'.,  17D 

Maclw'Primn,  148 

MaiLTaiitostylurt,  230 

Medt'tciMis,  21 « 

MbdeterUH  allpollor.'ns  117/.-.,  2](s:no 
flirvs()l(H^us||7/,-.,2ir),S(i!» 
fxiistiis  117/-.,  2(iM,  \M) 
plalitT  117/.,  215    ;{iil) 
lat.M-aliH  .«.-'i//.  2!tl 
iiiLrii|ms  A"'.,  21il 
iniiirtiiii'iiiiirt  Siiij,  202 
v.'lf-i  iir..  21!) 
viri.lillus  1I7/,.,  21-,,  3111 

McsistostyhH,  2:!(i 

M('snl)k'pli;iiMls,  -I'M)    " 

Miisca,  2S1) 

Murtca  IdDglroinis  /■'///•.,  289 

NematopiOL'tus,  !"/() 

Oaristylii^,  '2.W 

Oeili]isilo|)iis,  2')0 

Oi-tliocliilt-,  114 

Oithochile  denjinpta  117/.-.,  11.%  318 

Paraclins,  !t7 

Paraclius  allioiiotatus  Lir.,  1(1?. 

arcuatus  Lir.,  lOl 
Pelastoncurus,  l(i:{,  'M~ 
Pelastoneuru.s  al>l)reviatiis  Lir.,  338 
alteriiaiiH  Air.,  33!) 
I'ognatus  Aii\,  10!) 
l.Ttiis  All!.,  Kill 
laiiiHllatiis  All'.,  338 
loncicaiiila  Aif.,  104 
liiu'iiliiis  All'.,  10,") 
vagans  Air.,  107 
Peofles,  140 
Placioncnnis,  10(i 
Plagioiifiii'iis  iitiivittatn?*  An'.,  100 
Poi'phyroix,  142.  :-!4(i 
Porpliyrop.s  tiiiiiipi'iiiiis  An'..  14') 
loiigipes  All'..  34H 
mt'laiiipiis  Alt'.,  144 
iiicricoxa  Air.,  145 
pilos.c'oi'iiis  117/,-.,  s08 
rotuiiilict'ps  All).,  14(J 
Psilopus,  220 

Pailopus  all.ifoxa  117/-.,  243.  30" 
allioiiotatu.s  All'.,  27.') 
aiiiatus  U7/.,  242,  .306 
biuolor  y.it'.,  2fcW 


Psilopus  calcaraliia  An-.,  272 
caiiilatiilu-i  All'.,  271 
camlatiH  W'ml..  2:10,  2!)4 
CliiVM(ipra!*i(us_)  117/-.,  242, 

2ti.'),  30.') 
ciliafMs  All'.,  2i;o 
cfitiiatn:^  All'..  2(12 
(l.'licatiis  117/,-.,  241,  3(4 
dillnsiis  KVii/.,  2:i4,  •23:) 
diiiiiiliatiis  l.ir.,  24ii 
fcniniatiis  .<-///,  23:),  2!t(',  20.5 
lilipcs  All'..  2s(i 
gfinniif.T  117/,.,  24),  3(i,') 
giittula,  Willi.,  237 
liaT-ticiH  117/.,  243.  ;!20 
ini'isni.ilis  Mi'if..  241 
iiit'iiiiis  I  ir..  272 
ill  Iir  it  IK  117/,-.,  -242.  3(17 
jui'llli'lll-^   /ir..  2''>* 
If'pi.hiM  (17/..  '243.300 
limL'icnrni.s  rir.,  231.  204 
itiaciila  W'lnl..  2:\4.  2'.'2 

lllrl;illi]ins   /,>('.,  2.'')3 

uiuii.liK  Il7'i/..  '240,  2!ti! 
iiiifKifiMiHuatus   U'l/.,  242, 

■307 
pnll.-ns  H7Vi/..  •234.  275 
patilmlatiis  Su,/.  233,  2.'il 
pt-ractus  1(7/-.. '243,  310 
p.TiiKiiliciis  M"/.,  243,  320 
jiilosus  All'..  2.'(! 
jinitdliii'lisis  .]/iiri/  ,  241 
]isittaiiiiii'<  All'.,  2isl 
ra.li.iiw  .l/wr,y..240,  297,2:'8 
Ir^ayi  HV.-/.,  2:;2,  203 
scalier  All'..  2')0 
scintillaiis  /jr.,  273 
scolilnatiii'  /jr..  2(18 
siplio  Soil,  232,  247 
sipl.d  Mi'ir,/  .  -241.  207 
solidiis  117/  .  -243.  310 
piiavimii  11'./..  242,  licJ 
tciuM'  All'..  2.'^4 
iinguliv.'iia  M7/-.,  243.  :no 
Uiiit'asfiatiis  Sm/.  232,  1>>'.) 
vaiicgafns  An'.,  27*^ 
viiL'o  Willi.,  •24i",  20.') 

Rliatriiiii.\ir;\.  IIK  'M''< 

Kli,iL.M)ni'H' ns  pdlvi-lirninnr;  Aic.  34') 

Khapliium.  1  to 

HIiapliiiiMi  iiii-'tiliri',  141 

Saucropus.  224 

Sauciopiis  iliinidiatn-;  An'.,  22.'> 
lulicllu-  /."•..  2-I('i 
siip.'rliic'iis  Air..  227 


i 


I'l 

r* 

■  'i 

^l 

■  i 

vi 

■    1 

i! 

3'»0  INDEX. 


Hcfllns,  200 

buelluM  nvidiis  Aw.,  207 
exiistus  nik.,  202 
fUiffruH  Ah-.,  2(t!t 
si)iiiiinamis  }Cit.,  204 
PciapiiH,  2;jo 
SiiiiliotUH,  147 
t?yl)istroma,  nT) 
^iyiiipycnus,  IS.*! 
Hyinpycnurt  frontalis  J.w.,  188 
liuHatuH  Ai/>.,  ]81» 
iiodotus  J,w.,  1!)] 
tertiaims  Aw.,  187 
Synarthrus,  134 
hynartlirus  barbatns  Aw.,  138 

ciiioroiventria  Lw.,  137 


Synarthrus  pnlniaria  Liv.,  IS.") 
Syntornion,  I'S.i 
SystHnus,  139 

Tacliytrechns,  10!) 

Tachytrechus  angnntipennis  Aw.  ,113 
moct'hnH  A//'.,  Ho 
vorax  Aw.,  112 

Touoliophorus,  IS.*) 
Thinophilus,  148 

•Xantliochlorus,  223 
XantliodiloruH  lielvinua  Aw.,  224 
Xiphandriuiu,  141 


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